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Basilar Skull Fracture
Cardiovascular Presentations
Abdominal aortic aneurysm
Acute coronary syndrome (NSTEMI)
Acute coronary syndrome (STEMI)
Acute decompensated heart failure
Acute limb ischemia
Acute mesenteric ischemia
Aortic dissection
Aortic stenosis
Atrial fibrillation and flutter
Bradyarrhythmia and heart block
Cardiac arrest
Deep vein thrombosis
Myocarditis
Pericarditis
Pulmonary embolism
Stable angina
Superficial thrombophlebitis
Superior vena cava syndrome
Supraventricular tachycardia
Syncope (cardiogenic)
Unstable angina
Ventricular tachycardia
Respiratory Presentations
Acute bronchitis
Acute respiratory failure
Aspiration pneumonia
Asthma exacerbation
Bronchiolitis
Community-acquired pneumonia
COVID-19 pneumonia
COPD exacerbation
Croup
Croup (laryngotracheobronchitis)
Epiglottitis
Hemothorax
Hospital-acquired pneumonia
Pleural effusion
Pneumothorax (traumatic)
Pulmonary contusion
Spontaneous pneumothorax
Neurological Presentations
Bell's palsy
Benign paroxysmal positional vertigo
Brain abscess
Cauda equina syndrome
Cervical radiculopathy
Concussion (mild traumatic brain injury)
Encephalitis
Guillain-Barré syndrome
Hemorrhagic stroke (intracerebral)
Ischemic stroke
Lumbar radiculopathy
Malignant spinal cord compression
Migraine
Peripheral neuropathy (acute)
Retropharyngeal abscess
Schizophrenia (acute exacerbation)
Seizure (breakthrough:known epilepsy)
Seizure (first-time)
Spinal cord injury
Status epilepticus
Subarachnoid hemorrhage
Tension headache
Transient ischemic attack
Traumatic brain injury (moderate-severe)
Vestibular neuritis
Viral meningitis
Gastrointestinal Presentations
Acute appendicitis
Acute cholecystitis
Acute diverticulitis
Acute pancreatitis
Anal fissure
Choledocholithiasis and cholangitis
Clostridioides difficile colitis
Gastritis
Gastroenteritis (viral and bacterial)
Gastroesophageal reflux disease
Incarcerated or strangulated hernia
Inflammatory bowel disease flare
Large bowel obstruction
Lower GI hemorrhage
Peptic ulcer disease
Perforated viscus
Small bowel obstruction
Upper GI hemorrhage
Genitourinary and Reproductive Presentations
Acute prostatitis
Acute urinary retention
Ectopic pregnancy
Epididymitis
Orchitis
Ovarian torsion
Paraphimosis
Pelvic inflammatory disease
Priapism
Pyelonephritis
Renal laceration
Ruptured ovarian cyst
Testicular torsion
Tubo-ovarian abscess
Urinary tract infection (uncomplicated)
Urolithiasis (renal colic)
Vaginal bleeding (non-pregnant)
Infectious Disease Presentations
Acute sinusitis
Acute tonsillitis
Acute upper respiratory infection
Animal bite
Bacterial meningitis
Cellulitis
Conjunctivitis (bacterial)
Dental abscess
Endocarditis
Febrile neutropenia
Fournier gangrene
Hand-foot-mouth disease
Hepatitis (acute)
Herpes zoster
HIV-related illness
Human bite
Impetigo
Infected diabetic foot ulcer
Infectious mononucleosis
Influenza
Necrotizing fasciitis
Osteomyelitis
Otitis externa
Parasitic infection
Periorbital cellulitis
Peritonsillar abscess
Scabies
Sepsis
Septic arthritis
Spontaneous bacterial peritonitis
Tick-borne illness (Lyme disease)
Tinea infection
Tuberculosis
Viral exanthem
Wound infection
Trauma Presentations
Achilles tendon rupture
ACL and mceniscus tear
Ankle fracture
Ankle sprain
Burn
Calcaneus fracture
Cervical spine fracture
Clavicle fracture
Dental avulsion
Distal radius fracture
Drowning
Elbow fracture and dislocation
Electrical injury
Facial bone fracture
Facial laceration
Femur fracture
Fingertip amputation
Forearm fracture (radius and ulna)
Frostbite
Hand:finger laceration
Heat exhaustion
Heat stroke
Hip fracture
Humeral shaft fracture
Knee dislocation
Knee sprain
Lightning injury
Mandible fracture
Metacarpal fracture
Metatarsal fracture
Muscle strain
Nasal fracture
Non-accidental trauma
Orbital fracture
Patella fracture
Phalanx fracture (finger)
Proximal humerus fracture
Pulmonary contusion
Rib fracture
Rotator cuff tear (acute traumatic)
Scalp laceration
Scaphoid fracture
Shoulder dislocation
Skull fracture
Splenic laceration
Sternal fracture
Supracondylar pediatric fracture
Tendon laceration (hand:wrist)
Thoracic and lumbar spine fracture
Tibia:fibula fracture
Tibial plateau fracture
Toe fracture
Traumatic epistaxis
Traumatic hyphema
Toxicologic Presentations
Acetaminophen toxicity
Alcohol intoxication
Alcohol withdrawal
Anticholinergic toxicity
Anticoagulant overdose
Benzodiazepine overdose
Benzodiazepine:sedative overdose
Beta-blocker and calcium channel blocker toxicity
Carbon monoxide poisoning
Caustic ingestion
Digoxin toxicity
Drug eruption
Foreign body ingestion
Opioid intoxication
Opioid overdose
Opioid withdrawal
Organophosphate
Salicylate toxicity
Serotonin syndrome
Stimulant intoxication (cocaine, methamphetamine)
Tricyclic antidepressant overdose
Psychiatric Presentations
Acute anxiety
Acute psychosis
Agitation:behavioral emergency
Bipolar disorder
Conversion disorder
Major depressive episode
Neuroleptic malignant syndrome
Suicidal ideation and attempt
Musculoskeletal and Rheumatologic Presentations
Acute low back pain (mechanical)
Bursitis
Cervical radiculopathy
Costochondritis
Gout (acute)
Lumbar radiculopathy
Pseudogout
Tendinitis
Dermatology Presentations
Acute eczema (Eczema acute flare)
Allergic contact dermatitis
Erythema multiforme
Henoch-Schönlein purpura
Pressure injury
Psoriasis (acute flare)
Stevens-Johnson syndrome
Toxic epidermal necrolysis
Urticaria (acute)
Environmental and Exposure Presentations
Envenomation (snake, spider, insect)
High-altitude illness
Hypothermia
Hematologic and Oncologic Presentations
Acute chest syndrome
Coagulopathy
Hyperviscosity syndrome
Sickle cell crisis (vaso-occlusive)
Symptomatic anemia
Thrombocytopenia (severe)
Tumor lysis syndrome
Pediatric-Specific Presentations
Bronchiolitis
Croup
Emergency delivery
Febrile seizure
Kawasaki disease
Neonatal jaundice
Neonatal sepsis
Nursemaid's elbow
Pediatric fever 0 to 28 days
Pediatric fever 29 to 60 days
Pediatric fever 61 to 90 days
Pyloric stenosis
Slipped capital femoral epiphysis
Intussusception
Endocrine and Metabolic Presentations
Adrenal crisis
Diabetic ketoacidosis
Hypercalcemia
Hyperosmolar hyperglycemic state
Hypertensive emergency
Hypertensive urgency
Hypoglycemia
Myasthenia gravis crisis
Myxedema coma
Severe hyperkalemia
Severe hyponatremia
Thyroid storm
ENT and Maxillofacial Presentations
Acute laryngitis
Acute otitis media
Acute pharyngitis
Cerumen impaction
Epistaxis (anterior)
Nasal foreign body
Otitis externa
Tympanic membrane perforation
Ophthalmologic Presentations
Acute angle-closure glaucoma
Central retinal artery occlusion
Chemical eye injury
Corneal abrasion
Corneal ulcer
Globe rupture
Ocular foreign body
Orbital cellulitis
Retinal detachment
Obstetric Presentations
Hyperemesis gravidarum
Painful vaginal bleeding in pregnancy
Placenta previa
Placental abruption
Preeclampsia:eclampsia
Preterm labor
Threatened:inevitable:incomplete abortion
Systemic and Miscellaneous Presentations
Anaphylaxis
Angioedema
Cannabis-induced hyperemesis
Basilar Skull Fracture
POCUS
Procedures
Calculators
Resuscitation
ECG Guide
Back
Clinical Assessment Checklist
Browse categories and answer follow-up questions to refine your symptom profile.
Approach to the Critical Patient
Immediate stabilization
Airway priorities
▶
Oral airway adjuncts only — no nasopharyngeal airways, no nasotracheal intubation
▶
Risk of intracranial passage through skull base defect
Use oropharyngeal or video laryngoscope assisted orotracheal route
RSI if GCS < 8 or inability to protect airway
▶
Ketamine 1.5 mg/kg IV or etomidate 0.3 mg/kg IV for induction
Succinylcholine 1.5 mg/kg IV or rocuronium 1.2 mg/kg IV for paralysis
C-spine immobilization until cleared
▶
Manual inline stabilization during intubation
Cervical collar in place
Circulation assessment
▶
Cushing triad recognition
▶
Hypertension with widened pulse pressure
Bradycardia
Irregular respirations indicating impending herniation
Permissive hypotension contraindicated in isolated TBI
▶
Maintain SBP >= 110 mmHg in adults (BTF guideline)
MAP >= 80 mmHg target when ICP elevation suspected
Two large-bore IV access
▶
Normal saline or lactated Ringer's for resuscitation
Avoid hypotonic fluids — worsen cerebral edema
Herniation and ICP management
Herniation signs requiring immediate action
▶
Unilateral or bilateral fixed dilated pupils
▶
Transtentorial herniation pattern
Unilateral CN III palsy with ipsilateral pupil dilation
Decerebrate or decorticate posturing
▶
GCS motor score 1-2
Immediate neurosurgery consultation
Rapid neurological decline
▶
GCS drop >= 2 points from baseline
Lucid interval followed by deterioration
Temporizing ICP measures
▶
Head of bed elevation to 30 degrees
▶
Reduces ICP without compromising CPP
Also reduces CSF leak
Osmotherapy for impending herniation
▶
Mannitol 0.5 to 1 g/kg IV bolus
Hypertonic saline 3% 250 mL IV bolus as alternative
Hyperventilation as bridge only
▶
Target PaCO2 35 mmHg transiently
Not for sustained use — reduces cerebral perfusion
Key decision points
Imaging urgency
▶
CT head within 1 hour for high-risk features
▶
GCS < 15
Suspected open or depressed fracture
Any focal neurological deficit
CT angiography if vascular injury suspected
▶
Fracture through carotid canal or transverse foramen
Horner syndrome
Pulsatile tinnitus or expanding neck hematoma
Consultation triggers
▶
Neurosurgery for intracranial hemorrhage, expanding pneumocephalus, or depressed fracture
▶
Do not delay for imaging completion if herniation signs present
Immediate phone consult
ENT for temporal bone fracture with facial nerve palsy or persistent CSF leak
▶
Hearing loss and hemotympanum
CSF otorrhea persisting beyond 3-5 days
Interventional neuroradiology for vascular injury
▶
Carotid dissection
Carotid-cavernous fistula
History
Mechanism and presentation
Mechanism of injury
▶
High-velocity blunt trauma
▶
Motor vehicle collision
Fall from height
Assault or pedestrian-vehicle impact
Force characteristics
▶
Direct blow to skull base
Deceleration injury
Penetrating injury — higher risk of CSF fistula and vascular injury
Temporal course
▶
Time from injury to symptom onset
▶
Battle sign and raccoon eyes may be delayed 12 to 72 hours
CSF leak may not be apparent immediately
Loss of consciousness
▶
Duration of LOC
Lucid interval followed by deterioration — expanding hemorrhage
Retrograde and anterograde amnesia duration
Classic symptoms
Head and face
▶
Clear or blood-tinged nasal discharge — rhinorrhea
▶
CSF rhinorrhea if salty taste and watery consistency
Halo sign on gauze
Clear or blood-tinged ear discharge — otorrhea
▶
CSF otorrhea with temporal bone fracture
Hemotympanum
Headache
▶
Severity and location
Thunderclap onset suggesting SAH overlap
Neurological symptoms
▶
Hearing loss
▶
Conductive vs sensorineural pattern
Tinnitus and vertigo with CN VIII injury
Facial weakness
▶
Peripheral pattern suggests CN VII injury with temporal bone fracture
Onset — immediate vs delayed (better prognosis)
Anosmia — CN I injury with frontobasal fracture
▶
Usually persistent
Poorest recovery prognosis of cranial neuropathies
Visual changes and diplopia
▶
CN III, IV, VI palsies
Orbital apex syndrome
Associated symptoms and red flags
Alarm features requiring urgent escalation
▶
Declining GCS or worsening confusion
▶
Expanding intracranial hemorrhage
Cerebral edema
Seizures
▶
Early post-traumatic seizure within 7 days
Late seizure risk if cortical injury
Fever, neck stiffness, photophobia
▶
Meningitis complication — overall risk 1.4%, up to 10% with CSF leak
Delayed onset days to weeks after injury
Vascular injury symptoms
▶
Pulsatile tinnitus — carotid-cavernous fistula
▶
Pulsatile exophthalmos
Cranial nerve palsies III, IV, VI
Horner syndrome
▶
Ptosis, miosis, anhidrosis
Carotid dissection through carotid canal fracture
Contralateral weakness or hemisensory loss
▶
Carotid or vertebrobasilar artery dissection
Risk factors and history
Patient factors
▶
Age over 60 years
▶
Lower threshold for imaging and admission
Higher complication risk
Anticoagulant or antiplatelet use
▶
Significantly increased intracranial hemorrhage risk
Document agent and last dose — reversal planning
Alcohol or drug intoxication
▶
Complicates neurological assessment
Independent risk factor for TBI
Prior history
▶
Prior head trauma or skull fractures
▶
Prior neurosurgery or sinus surgery
Chronic sinusitis — increased meningitis risk
Bleeding disorders or coagulopathy
▶
Seizure history
Immunosuppression — increased meningitis risk
Physical Exam
Vital signs
Hemodynamic assessment
▶
Blood pressure
▶
Hypertension with bradycardia — Cushing triad
SBP < 90 mmHg in TBI associated with doubled mortality
Heart rate
▶
Bradycardia component of Cushing triad
Tachycardia with hemorrhagic shock or pain
Respiratory pattern
▶
Irregular respirations — Cushing triad, impending herniation
Cheyne-Stokes pattern with diencephalic injury
Temperature
▶
Fever suggesting meningitis — may be delayed
Hyperthermia from central injury
Head and skull base signs
Classic basilar skull fracture signs
▶
Raccoon eyes — bilateral periorbital ecchymosis
▶
May be delayed 12 to 72 hours from injury
Suggests anterior fossa fracture
Likelihood ratio for intracranial injury approximately 16 (95% CI 3.1 to 59)
Battle sign — postauricular ecchymosis over mastoid
▶
Delayed 12 to 72 hours
Suggests petrous or mastoid fracture
Specificity high when present
Scalp palpation
▶
Depressed fracture detection
Hematoma or laceration over skull base
Ear examination
▶
Hemotympanum on otoscopy
▶
Blood behind tympanic membrane
Suggests middle ear involvement
Blood or clear fluid in external auditory canal
▶
CSF otorrhea with dural tear
Halo sign on cotton pledget
Tympanic membrane integrity
▶
Perforation possible with severe fracture
Cranial nerve assessment
Systematic cranial nerve examination
▶
CN I — olfactory
▶
Anosmia with frontobasal fracture
Test each nostril separately
CN II — visual acuity and fields
▶
Optic canal fracture
Afferent pupillary defect
CN III, IV, VI — extraocular movements
▶
Diplopia
Cavernous sinus involvement
CN VII — facial nerve
▶
Peripheral pattern weakness all branches
Temporal bone fracture most common cause
Immediate onset vs delayed — better prognosis if delayed
CN VIII — vestibulocochlear
▶
Sensorineural hearing loss
Nystagmus and vestibular dysfunction
CN IX, X, XI, XII — lower cranial nerves
▶
Dysphonia and dysphagia with posterior fossa fracture
Tongue deviation
Neurological exam and CSF leak detection
Mental status and GCS
▶
GCS components — eye, verbal, motor
▶
Serial assessments for trend
GCS < 13 — moderate TBI
GCS <= 8 — severe TBI
Orientation, attention, memory
▶
Anterograde amnesia duration
Post-traumatic confusional state
CSF leak detection
▶
Rhinorrhea — halo sign on gauze
▶
Central blood ring with surrounding clear ring
Bedside screening — not diagnostic alone
Nasal fluid glucose testing
▶
Low specificity — not recommended as primary test
Beta-2 transferrin preferred
Otorrhea assessment
▶
Clear fluid at canal opening
Compressible tragus worsening drainage
PITFALLS
Common examination errors
▶
Missing delayed signs
▶
Raccoon eyes and Battle sign not present at initial exam
Reexamine at 12 to 24 hours if mechanism is concerning
Nasal passages access in suspected skull base fracture
▶
Avoid nasogastric tubes — intracranial passage risk documented
Use orogastric route exclusively
Alcohol intoxication masking neurological decline
▶
Serial GCS mandatory
Low threshold for CT even in intoxicated patient
Differential Diagnosis
Intracranial hemorrhage
Life-threatening hemorrhage patterns
▶
Epidural hematoma
▶
ICD-10 S06.4
Middle meningeal artery injury with temporal bone fracture
Lucid interval then rapid deterioration — classic but not universal
Subdural hematoma
▶
ICD-10 S06.5
Bridging vein disruption
Crescent-shaped hyperdensity on CT
Subarachnoid hemorrhage traumatic
▶
ICD-10 S06.6
Hyperdensity in cisterns and sulci
Cerebral vasospasm risk
Intracerebral contusion
▶
ICD-10 S06.3
Coup and contrecoup pattern
Temporal and frontal poles predilection
Vascular injuries
Arterial dissection and fistula
▶
Carotid artery dissection
▶
Fracture through carotid canal
Horner syndrome, neck pain, delayed stroke
ICD-10 S15.0
Vertebral artery dissection
▶
Posterior fossa or foramen transversarium fracture
Wallenberg syndrome, posterior circulation stroke
Carotid-cavernous fistula
▶
Pulsatile exophthalmos, chemosis
Bruit over orbit
ICD-10 Q28.3 or posttraumatic code
Cavernous sinus thrombosis
▶
Bilateral proptosis, fever, cranial nerve III IV VI palsies
Risk with concurrent sinus injury or infection
Mimics and associated injuries
CSF leak mimics
▶
Allergic rhinitis or vasomotor rhinitis
▶
Bilateral watery rhinorrhea
No trauma history
Beta-2 transferrin negative
Epistaxis mixed with serous fluid
▶
Halo sign false positive possible
Beta-2 transferrin confirmatory
Meningitis
▶
Bacterial meningitis complicating CSF leak
▶
ICD-10 G00
Delayed onset days to weeks
Overall incidence approximately 1.4%; up to 10% with CSF leak
Chemical meningitis from blood products
▶
Sterile inflammatory response
Differentiate from infectious by LP
Non-accidental trauma
▶
Pediatric patients and vulnerable adults
▶
Mechanism inconsistent with injury pattern
Multiple injuries at different stages
ICD-10 T74.1 adult, T74.12 child
Laboratory Tests
Core trauma and coagulation labs
Hematology panel
▶
Complete blood count
▶
Hemoglobin and hematocrit for hemorrhage assessment
Platelet count — thrombocytopenia increases hemorrhage risk
Leukocytosis if fever suggests meningitis
Coagulation studies
▶
PT/INR for anticoagulant assessment and reversal planning
PTT for heparin effect or factor deficiency
Fibrinogen if massive hemorrhage suspected
Metabolic panel
▶
Electrolytes and renal function
▶
Sodium monitoring — SIADH risk with TBI
Glucose — hyperglycemia worsens TBI outcomes
Creatinine for contrast and drug dosing
CSF biomarkers
Beta-2 transferrin assay
▶
Gold standard for CSF leak confirmation
▶
Sensitivity 96%, specificity 94.6%
CSF-specific protein not present in serum, tears, or nasal secretions
Requires laboratory processing — not bedside
Sample collection
▶
Collect fluid from nose or ear on sterile gauze
Paired serum sample recommended by some protocols
Beta-trace protein
▶
Alternative CSF biomarker
▶
Comparable or superior accuracy to beta-2 transferrin in meta-analyses
Faster turnaround in some labs
May be affected by renal failure — interpret with caution
Toxicology and secondary labs
Toxicology screen
▶
Blood alcohol level
▶
Complicates neurological assessment
Independent risk factor for trauma
Quantitative level guides observation duration
Urine drug screen
▶
Opiates, benzodiazepines, stimulants
Affects mental status interpretation
Type and screen
▶
Significant hemorrhage or surgical intervention anticipated
▶
Crossmatch if active transfusion requirement
Emergency release protocol if massive hemorrhage
Glucose testing of nasal fluid
▶
Historically used bedside screening tool
▶
Low specificity — glucose also present in lacrimal fluid
Replaced by beta-2 transferrin as preferred test
Diagnostic Tests
Scoring Systems
TBI severity classification
▶
GCS-based stratification
▶
Mild TBI — GCS 13 to 15
Moderate TBI — GCS 9 to 12
Severe TBI — GCS <= 8
ACEP Level B recommendation for GCS use in TBI triage
Canadian CT Head Rule — for mild TBI patients
▶
High-risk factors mandating CT
GCS score 13 to 15, failure to reach GCS 15 at 2 hours
Suspected open or depressed skull fracture
Any sign of basal skull fracture
Vomiting >= 2 episodes
Age >= 65 years
Medium-risk factors — amnesia >= 30 minutes, dangerous mechanism
Basilar skull fracture classification by location
▶
Anterior fossa (frontobasal)
▶
CSF rhinorrhea
Anosmia
Raccoon eyes
Middle fossa (laterobasal or temporal bone)
▶
Hemotympanum
CSF otorrhea
Facial nerve palsy
Hearing loss
Posterior fossa
▶
Battle sign
Lower cranial nerve palsies CN IX to XII
Vertebrobasilar injury risk
Injury severity and complication risk
▶
Uncomplicated basilar skull fracture
▶
GCS 15, no hemorrhage, no CSF leak, no cranial nerve deficit
Candidate for ED discharge with reliable follow-up
Complicated basilar skull fracture
▶
Associated intracranial hemorrhage
Active CSF leak
Cranial nerve deficit
Pneumocephalus or vascular injury
Requires admission
MRI
MRI brain indications
▶
Role in basilar skull fracture
▶
Not first-line — CT preferred for acute fracture detection
Adjunct for cortical contusion, diffuse axonal injury, white matter injury
Useful when clinical picture exceeds CT findings
MRI cisternography
▶
For complex or intermittent CSF leaks when CT is equivocal
T2 weighted sequences demonstrate CSF signal at defect
Non-invasive and does not require intrathecal contrast
MRI brain for delayed complications
▶
Vascular injury characterization if CTA not diagnostic
Carotid or vertebral dissection on MRA sequences
Cavernous sinus thrombosis on contrast-enhanced MRI
MRI limitations
▶
Bone detail inferior to CT
▶
Cannot replace CT for acute fracture detection
Motion artifact in uncooperative or agitated patients
Availability and time
▶
Not suitable for unstable patients
Prolonged acquisition time
Implant compatibility screening required
CT
Non-contrast CT head — first-line imaging
▶
Indications
▶
Any suspected basilar skull fracture
GCS < 15 after head trauma
Clinical signs of basal fracture
NICE guideline: CT within 1 hour for high-risk features
Fracture detection
▶
High-resolution thin cuts <= 1 mm through skull base dramatically improves sensitivity
Bone window algorithm required
Standard soft tissue windows miss many fractures
Associated findings
▶
Intracranial hemorrhage
Pneumocephalus — air-fluid levels or tension pneumocephalus
Midline shift
Effacement of basal cisterns
CT angiography — head and neck
▶
Indications for vascular screening
▶
Fracture through carotid canal
Fracture through foramen transversarium
Neurological deficits suggesting dissection
Horner syndrome
Expanding neck hematoma or pulsatile tinnitus
Performance
▶
Sensitivity for carotid dissection approximately 93% to 97%
ACR Appropriateness Criteria — usually appropriate for major blunt trauma with vascular concern
CT temporal bone
▶
Dedicated thin-section study for petrous bone
▶
Indicated for suspected temporal bone fracture with hearing loss or facial palsy
Longitudinal vs transverse fracture classification
Ossicular chain disruption assessment
CT cisternography
▶
Intrathecal contrast for active CSF leak localization
Indicated when non-invasive imaging equivocal
Requires active leak at time of study
Ultrasound
Point of care ultrasound in basilar skull fracture
▶
Role and limitations
▶
No direct role for skull base fracture detection
Useful for resuscitation and hemodynamic assessment in polytrauma
FAST examination for abdominal hemorrhage in polytrauma
Optic nerve sheath diameter
▶
Ultrasound measurement of ONSD > 5 mm suggests elevated ICP
Sensitivity approximately 74%, specificity approximately 100%
Rapid bedside ICP screening adjunct
Hemodynamic POCUS
▶
Cardiac function for shock differential
IVC assessment for volume responsiveness
Pleural assessment for pneumothorax in polytrauma
Disposition
Admission indications
Mandatory admission criteria
▶
Neurological criteria
▶
GCS < 15 or any neurological deficit
Declining GCS or lucid interval with deterioration
Seizure activity
Imaging findings
▶
Any intracranial hemorrhage on CT
Pneumocephalus especially if tension
Midline shift
Clinical complications
▶
Active CSF leak — rhinorrhea or otorrhea
Cranial nerve deficit (facial palsy, hearing loss, diplopia)
Suspected vascular injury
Additional admission criteria
▶
Medical factors
▶
Coagulopathy requiring reversal
Anticoagulant or antiplatelet therapy
Intoxication complicating assessment
Social factors
▶
No responsible adult for observation at home
Unreliable follow-up
Level of care
ICU admission indications
▶
Neurological severity
▶
GCS <= 8 — severe TBI
Herniation signs
ICP monitoring anticipated
Need for intubation
Hemorrhage severity
▶
Expanding intracranial hemorrhage
Surgical intervention required
Coagulopathy with ongoing hemorrhage
Neurosurgical operative indications
▶
Emergent or urgent surgery
▶
Expanding epidural hematoma
Symptomatic subdural hematoma
Open or depressed skull fracture
Tension pneumocephalus
CSF leak surgery
▶
Endoscopic endonasal repair if CSF leak persists beyond 7 days
IDSA strong recommendation for surgical repair at 7-day threshold
Discharge criteria
Copy
Criteria for ED discharge — uncomplicated basilar skull fracture
▶
Clinical criteria
▶
GCS 15 with normal neurological examination
No cranial nerve deficit
No active CSF leak
Imaging criteria
▶
No intracranial hemorrhage on CT
No pneumocephalus
No mass effect
Social criteria
▶
Responsible adult able to observe for 24 hours
Access to emergency care if deterioration
Neurosurgery or trauma surgery follow-up arranged within 1 to 2 weeks
Follow-up plan
▶
Subspecialty follow-up
▶
Neurosurgery or trauma clinic within 1 to 2 weeks
ENT if hearing loss or facial nerve palsy
Audiology if hearing concerns
Imaging follow-up
▶
Repeat CT as directed by neurosurgery
MRI for persistent neurological deficits
Treatment
Immediate interventions
Airway and oxygenation
▶
Oxygen supplementation
▶
SpO2 target >= 95% — hypoxia worsens secondary brain injury
Avoid hyperoxia — PaO2 target 80 to 120 mmHg
Orotracheal intubation if indicated
▶
Video laryngoscopy preferred for C-spine protection
Avoid nasotracheal route — intracranial passage risk
Avoid nasogastric tubes — use orogastric route
Post-intubation ventilation
▶
Tidal volume 6 to 8 mL/kg ideal body weight
Avoid routine hyperventilation — reserve for herniation emergency
PaCO2 target 35 to 45 mmHg
Hemodynamic targets
▶
Blood pressure management
▶
SBP >= 110 mmHg for adults with TBI (BTF 4th edition)
MAP >= 80 mmHg when ICP elevation suspected
Vasopressors if fluid resuscitation insufficient
Fluid resuscitation
▶
Isotonic crystalloids — normal saline or lactated Ringer's
Avoid hypotonic fluids — exacerbate cerebral edema
Hypertonic saline preferred for ICP management if concurrent hypovolemia
ICP management medications
Osmotherapy
▶
Mannitol
▶
Dose 0.5 to 1 g/kg IV bolus
20% solution over 15 to 20 minutes
Repeat dosing every 4 to 6 hours as needed
Hold if serum osmolality > 320 mOsm/kg or euvolemia not achieved
Hypertonic saline 3%
▶
Dose 250 mL IV bolus for acute herniation
Target serum sodium 145 to 155 mmol/l
May be preferred over mannitol in hypovolemic patients
Hypertonic saline 23.4%
▶
Dose 30 mL IV for refractory herniation
Central line preferred for administration
Most rapid onset osmotherapy option
Anticoagulation reversal
▶
Warfarin reversal
▶
4-factor PCC — dose based on INR and body weight
INR 2 to 4: 25 units/kg IV
INR 4 to 6: 35 units/kg IV
INR > 6: 50 units/kg IV
Adjunct vitamin K 10 mg IV for sustained reversal
Direct oral anticoagulant reversal
▶
Idarucizumab 5 g IV for dabigatran — Class I recommendation
Andexanet alfa for factor Xa inhibitors (rivaroxaban, apixaban, edoxaban)
4-factor PCC as alternative if specific reversal unavailable
Antiplatelet reversal
▶
Platelet transfusion for surgical intervention with aspirin or P2Y12 use
Desmopressin 0.3 mcg/kg IV for uremic platelet dysfunction adjunct
Seizure management
Prophylactic antiepileptic therapy
▶
Levetiracetam — preferred agent for seizure prophylaxis in TBI
▶
Dose 500 to 1000 mg IV or PO twice daily
Duration 7 days for early post-traumatic seizure prevention
BTF guideline Level IIA recommendation
Phenytoin — alternative
▶
Loading dose 20 mg/kg IV at maximum rate 50 mg/min
Maintenance 5 mg/kg/day IV or PO in divided doses
Monitor for cardiac arrhythmia and hypotension during IV loading
Indications for prophylaxis
▶
GCS < 10
Cortical contusion on CT
Depressed skull fracture
Penetrating head injury
Early post-traumatic seizure
Active seizure treatment
▶
Benzodiazepine first line
▶
Lorazepam 0.1 mg/kg IV at 2 mg/min
Midazolam 10 mg IM if no IV access
Diazepam 5 to 10 mg IV as alternative
Second-line agents if seizure continues beyond 5 minutes
▶
Levetiracetam 60 mg/kg IV (max 4500 mg) over 10 minutes
Fosphenytoin 20 mg PE/kg IV at max 150 mg PE/min
Valproate 40 mg/kg IV at max 6 mg/kg/min
CSF leak management
Conservative measures — first-line
▶
Positional measures
▶
Head of bed elevation to 30 degrees
Bed rest with activity restriction
Avoid nose blowing, straining, Valsalva maneuver
Stool softeners to prevent straining
▶
Docusate sodium 100 mg PO twice daily
Polyethylene glycol 17 g PO daily as alternative
Duration — majority of CSF leaks resolve within 7 days with conservative management
Escalation for persistent CSF leak
▶
Lumbar drain
▶
Consider if CSF leak persists beyond 3 to 5 days of conservative management
Target drainage 5 to 10 mL/hour
Monitor for headache, over-drainage, meningitis
Surgical repair
▶
IDSA strong recommendation if CSF leak persists beyond 7 days
Endoscopic endonasal repair preferred when anatomically feasible
Intrathecal fluorescein assists intraoperative defect identification
Antibiotic policy
Prophylactic antibiotics — NOT recommended
▶
Evidence base
▶
Cochrane review — no demonstrated reduction in meningitis with prophylaxis
IDSA strong recommendation against prophylactic antibiotics
AAST consensus against prophylaxis
2026 nationwide cohort study confirmed no benefit
Risk of prophylaxis
▶
Selects for resistant organisms
No change in meningitis incidence or mortality
Vaccination
▶
Pneumococcal vaccination recommended for patients with CSF leak
▶
IDSA strong recommendation
PCV15 or PCV20 preferred in adults
Administer once acute phase resolved if not up to date
Therapeutic antibiotics — only for confirmed meningitis
▶
Empiric regimen for post-traumatic bacterial meningitis
▶
Ceftriaxone 2 g IV every 12 hours
Vancomycin 15 to 20 mg/kg IV every 8 to 12 hours — covers resistant pneumococcus
Dexamethasone 0.15 mg/kg IV every 6 hours for 4 days adjunct
Cranial nerve and vascular injury management
Facial nerve palsy
▶
Initial management — conservative observation
▶
Delayed onset palsy has better prognosis than immediate onset
Eye protection with lubricating drops and tape for incomplete closure
Ophthalmology consultation if corneal exposure
Corticosteroids for selected cases
▶
Consider for severe delayed-onset facial palsy
Prednisolone 1 mg/kg/day PO for 5 to 7 days
Surgical decompression in selected cases
▶
ENT decision based on electromyography results
High-grade degeneration on nerve conduction studies
Vascular injury — carotid dissection
▶
Anticoagulation or antiplatelet therapy
▶
Decision based on hemorrhagic complication risk
Aspirin 325 mg PO daily if anticoagulation contraindicated by intracranial hemorrhage
Heparin infusion if no intracranial hemorrhage and high stroke risk
Interventional neuroradiology consultation for stenting if refractory
Special Populations
Pregnancy
Physiologic considerations
▶
Trauma is leading non-obstetric cause of maternal mortality
▶
Basilar skull fracture in pregnancy requires multidisciplinary team
OB and neurosurgery involvement from time of presentation
Physiologic changes affecting assessment
▶
Baseline hypotension and tachycardia of pregnancy
Hypercoagulable state — may mask evolving hemorrhage
Elevated intracranial compliance from progesterone effects
Imaging in pregnancy
▶
CT head — fetal radiation exposure minimal but perform without delay
▶
Fetal dose from head CT approximately 1 to 10 mGy — below teratogenic threshold
Do not withhold CT if clinically indicated — benefit outweighs risk
Shield pelvis/abdomen when feasible
MRI preferred over CT for follow-up imaging if stable
▶
No ionizing radiation
Gadolinium — avoid in first trimester if possible; use if clinically essential
Treatment modifications
▶
Mannitol use in pregnancy
▶
May cause fetal dehydration and bradycardia
Use only for life-threatening ICP elevation
Hypertonic saline may be preferred
Antiepileptic medications
▶
Levetiracetam — limited fetal data but preferred over valproate in acute setting
Avoid valproate — high teratogenicity risk
Anticoagulation for vascular injury
▶
Heparin preferred over warfarin — does not cross placenta
DOACs contraindicated in pregnancy
Fetal monitoring
▶
Continuous fetal heart rate monitoring once viable (>= 24 weeks)
Obstetric consultation for Kleihauer-Betke if abdominal trauma concurrent
Geriatric
Physiologic differences
▶
Cerebral atrophy — larger subdural space
▶
More tolerant of expanding hemorrhage before symptoms
Delayed presentation of significant hematomas
Higher vigilance required for occult hemorrhage
Reduced physiologic reserve
▶
Lower threshold for herniation at a given ICP
Cerebrovascular disease increases ischemia risk
Anticoagulant and antiplatelet prevalence
▶
Higher proportion of elderly on warfarin, DOACs, antiplatelets
Reversal urgency higher in this population
Document all agents on presentation
Imaging thresholds
▶
Lower imaging threshold in elderly
▶
Age >= 65 mandates CT per Canadian CT Head Rule
Even with GCS 15 and normal exam — anticoagulant use alone warrants CT
Osteoporosis increases fracture risk at lower impact energy
Disposition considerations
▶
Admission thresholds lower than younger adults
▶
Anticoagulant use — admit even with normal initial CT
Frailty and falls risk — social and functional assessment
Greater risk of delayed deterioration
ICP medications in elderly
▶
Mannitol — monitor for renal insufficiency and hyperosmolarity
Serum osmolality target < 320 mOsm/kg
Volume depletion risk higher — careful fluid balance
Pediatrics
Pediatric epidemiology and pattern
▶
Basilar skull fractures in children
▶
Less common than vertex fractures
10-year analysis — complications from simple basilar skull fractures uncommon with conservative management
Non-accidental trauma must be considered in all pediatric head injury
Age-specific mechanism
▶
Infants — birth trauma, NAT (non-accidental trauma)
Toddlers — falls, NAT
Adolescents — MVA, sports
Imaging decision rules — pediatrics
▶
PECARN TBI rule — validated tool for CT decision in children
▶
High-risk: GCS < 15, altered mental status, palpable skull fracture — CT recommended
Intermediate-risk: LOC, severe headache, vomiting, age < 2 with scalp hematoma — observation vs CT
Low-risk: CT not required
Reduces unnecessary radiation exposure
Radiation considerations
▶
Pediatric brain more radiosensitive than adult
As low as reasonably achievable (ALARA) principle
CT dose modulation and pediatric protocols
Treatment modifications
▶
Weight-based dosing for ICP management
▶
Mannitol 0.5 to 1 g/kg IV
Hypertonic saline 3% 2 to 5 mL/kg IV for acute ICP elevation
Levetiracetam 20 to 60 mg/kg/day IV divided every 12 hours
Seizure prophylaxis
▶
Indicated for severe TBI GCS <= 8 and cortical injury
Levetiracetam preferred over phenobarbital for acute seizures in children
Antibiotic policy same as adults
▶
Prophylactic antibiotics not recommended
Pneumococcal vaccination for CSF leak
Suspected NAT
▶
Mandatory reporting to child protective services
Skeletal survey and ophthalmology for retinal hemorrhage
Social work consultation
Background
Epidemiology
Incidence and burden
▶
Prevalence among skull fractures
▶
Basilar skull fractures account for 7% to 20% of all skull fractures
Present in approximately 4% of all head trauma ED presentations
Among patients with TBI requiring hospitalization — significant proportion
Demographics
▶
Higher incidence in young adult males
Bimodal distribution — young adults (trauma) and elderly (falls)
Age over 60 years — lower impact energy sufficient for fracture due to osteoporosis
Mechanism distribution
▶
Motor vehicle collisions — most common cause in adults
Falls from height
Assault
Sports-related trauma
Complications and outcomes
▶
CSF leak
▶
Occurs in 2% to 20.8% of basilar skull fractures
Majority resolve spontaneously within 7 days
Persistent leak > 7 days — surgical intervention recommended
Meningitis risk
▶
Overall incidence approximately 1.4% in basilar skull fractures
Up to 10% in those with CSF leak
Risk not reduced by prophylactic antibiotics — Cochrane review
Cranial nerve injury
▶
CN VII and CN VIII most commonly injured
CN I injury has poorest recovery prognosis
CN VII — immediate onset has worse prognosis than delayed onset
Vascular injury
▶
Carotid dissection risk with carotid canal fracture
Carotid-cavernous fistula from cavernous segment injury
Vertebral artery dissection with posterior fossa fracture
Pathophysiology
Fracture mechanisms
▶
Biomechanics of skull base fracture
▶
High-velocity impact transmits forces to skull base through calvarium
Skull base is thinner and more complex than calvarium
Foramina create stress concentration points
Common fracture patterns by region
▶
Anterior fossa — cribriform plate, ethmoid, sphenoid wing
Middle fossa — petrous temporal bone, sphenoid
Posterior fossa — occipital bone, clivus, foramen magnum
Dural tear mechanism
▶
Dura adherent to skull base — fracture often tears dura
Torn dura allows CSF communication with paranasal sinuses or middle ear
Route for ascending bacterial meningitis
Complications pathophysiology
▶
CSF leak
▶
Dural tear creates fistula between subarachnoid space and sinus or ear
Intracranial pressure gradient drives CSF outward
Pneumocephalus — air enters through same defect
Cranial nerve injury mechanisms
▶
Direct nerve compression or laceration by fracture fragment
Stretch injury from skull base deformation
Ischemic injury from vascular injury
Edema or hematoma within nerve canal
Vascular injury mechanism
▶
Fracture extension to vascular canals — carotid, vertebral
Intimal tear from stretch or direct compression
Dissection leads to thrombosis, emboli, or pseudoaneurysm formation
Carotid-cavernous fistula — direct laceration of cavernous segment creates arteriovenous shunt
Therapeutic Considerations
Evidence base for management decisions
▶
Antibiotic prophylaxis evidence
▶
Cochrane review — no benefit of prophylactic antibiotics in reducing meningitis
IDSA and AAST guidelines — strong recommendation against prophylaxis
2026 nationwide cohort study confirmed no benefit of prophylactic antibiotics
Risk of antibiotic stewardship concerns with routine prophylaxis
CSF leak management evidence
▶
Conservative management first — majority resolve within 7 days
Lumbar drain for persistent leak 3 to 5 days
Surgical repair at 7 days — IDSA strong recommendation
Endoscopic endonasal approach preferred over open repair when feasible
ICP management evidence
▶
Brain Trauma Foundation guidelines 4th edition
SBP >= 110 mmHg associated with improved outcomes
Osmotherapy reduces ICP — mannitol and hypertonic saline both effective
Seizure prophylaxis evidence
▶
Levetiracetam equivalent to phenytoin — fewer drug interactions
Prophylaxis reduces early post-traumatic seizures — not late seizures
Duration 7 days supported by BTF guidelines
Classification systems
▶
Anatomic classification
▶
Frontobasal, laterobasal, posterior basal
Guides expected complications and cranial nerve risk
Severity classification
▶
Uncomplicated vs complicated — determines disposition
Based on GCS, hemorrhage, CSF leak, cranial nerve status
Patient Discharge Instructions
copy discharge instructions
Copy
Diagnosis and what happened
▶
You have been diagnosed with a fracture at the base of your skull
▶
This type of fracture involves the bones at the bottom of the skull
It usually heals on its own over 6 to 8 weeks with proper care
Why you were evaluated
▶
Imaging was done to make sure there was no serious bleeding in your brain
Your tests were reassuring and you are safe to go home today
Activity restrictions
▶
Things to avoid for the next 2 to 4 weeks
▶
Do not blow your nose — this can worsen any fluid leakage
Avoid straining, heavy lifting, or activities that cause you to hold your breath
No contact sports or activities with fall or impact risk until cleared by your doctor
Do not fly on an airplane until cleared by your specialist
Positioning
▶
Keep your head elevated — sleep with the head of the bed raised or use extra pillows
This helps reduce any fluid leak and headache
Medications
▶
Pain management
▶
Acetaminophen (Tylenol) is the preferred pain reliever
Avoid ibuprofen, aspirin, and naproxen — these can increase bleeding risk
Avoid sedating medications including sleeping pills and antihistamines
Stool softeners
▶
Take a stool softener such as Colace to avoid straining with bowel movements
Follow-up appointments
▶
Neurosurgery or trauma clinic within 1 to 2 weeks
▶
Call today to arrange this appointment if not already scheduled
Bring any imaging discs or reports to your appointment
Additional referrals as applicable
▶
Ear nose and throat specialist if you have hearing changes or facial weakness
Audiologist for formal hearing testing
Return immediately to emergency if any of the following occur
▶
Neurological warning signs
▶
Increasing headache that is not responding to acetaminophen
New or worsening confusion, unusual sleepiness, or difficulty waking
Weakness or numbness anywhere in your body
New facial drooping or weakness
Seizures or convulsions
Vision changes or double vision
Repeated vomiting
Signs of meningitis
▶
Fever with severe headache
Neck stiffness or pain with bending the neck
Sensitivity to light or sound
Rash
CSF leak concerns
▶
Clear watery fluid draining from your nose or ear
Salty or sweet taste when leaning forward
References
Guidelines and key sources
Clinical practice guidelines
▶
Brain Trauma Foundation (BTF) Guidelines for Management of Severe TBI 4th Edition 2016
▶
Blood pressure targets — SBP >= 110 mmHg in adults
Osmotherapy, seizure prophylaxis, ICP monitoring recommendations
ACEP Clinical Policy — Mild TBI in Adults 2023
▶
Valente JH et al. Annals of Emergency Medicine 2023
CT indications, observation, and disposition guidance
IDSA Clinical Practice Guidelines for Healthcare-Associated Ventriculitis and Meningitis 2017
▶
Tunkel AR et al. Clinical Infectious Diseases 2017
Antibiotic prophylaxis not recommended — strong recommendation
Pneumococcal vaccination recommended for CSF leak
AAST Antibiotic Prophylaxis in Injury 2023
▶
Appelbaum RD et al. Trauma Surgery and Acute Care Open 2023
Consensus against prophylactic antibiotics for basilar skull fracture
Systematic reviews and key studies
▶
Cochrane Review — Antibiotic Prophylaxis for Preventing Meningitis in Basilar Skull Fractures
▶
Ratilal BO et al. Cochrane Database 2015
No benefit of prophylactic antibiotics demonstrated
Nationwide Cohort Study — Prophylactic Antibiotic Use in Closed Basilar Skull Fractures
▶
Kim E et al. Journal of Trauma and Acute Care Surgery 2026
Confirmed no benefit of prophylactic antibiotics
CSF Biomarkers in Leak Detection — Systematic Review and Meta-Analysis
▶
Bhat SN et al. Clinica Chimica Acta 2025
Beta-2 transferrin and beta-trace protein diagnostic accuracy
Physical Exam Signs for Intracranial Injury — JAMA Rational Clinical Examination
▶
Easter JS et al. JAMA 2015
Likelihood ratio of 16 for skull fracture signs predicting intracranial injury
Imaging guidelines
▶
ACR Appropriateness Criteria — Head Trauma 2021
▶
Expert Panel on Neurological Imaging, Shih RY et al. JACR 2021
CT head recommendations and CTA indications
ACR Appropriateness Criteria — Major Blunt Trauma Update 2025
▶
Expert Panel on Polytrauma Imaging, Lee JT et al. JACR 2026
Vascular injury screening and imaging protocols
CT of Skull Base Fractures — Classification Systems, Complications, and Management
▶
Dreizin D et al. Radiographics 2021
Imaging classification and fracture patterns
Diagnostic Tools and Imaging for Skull Base CSF Leak
▶
Caplan IF et al. Otolaryngologic Clinics of North America 2026
Beta-2 transferrin, MRI cisternography, CT cisternography
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.
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Management Protocols
Basilar Skull Fracture