Skip to main content
Symptom
dx.
Menu
Clinical Reference
Approaches
I have a symptom
Management
I know the diagnosis
Orthopedic Injuries
Fractures & dislocations
Calculators
Clinical calculators
Practical Skills
ECG
Interpretation guide
POCUS
Bedside ultrasound
Procedures
Step-by-step guides
Resuscitation
ACLS / PALS / NRP
Learn
Blog
Articles & updates
Deep Dive
In-depth clinical reviews
About
Our mission
Symptom
dx.
Clinical Reference
Approaches
I have a symptom
Management
I know the diagnosis
Orthopedic Injuries
Fractures & dislocations
Calculators
Clinical calculators
Practical Skills
ECG
Interpretation guide
POCUS
Bedside ultrasound
Procedures
Step-by-step guides
Resuscitation
ACLS / PALS / NRP
Learn
Blog
Articles & updates
Deep Dive
In-depth clinical reviews
About
Our mission
Get Started
Menu
Clinical Reference
Approaches
I have a symptom
Management
I know the diagnosis
Orthopedic Injuries
Fractures & dislocations
Calculators
Clinical calculators
Practical Skills
ECG
Interpretation guide
POCUS
Bedside ultrasound
Procedures
Step-by-step guides
Resuscitation
ACLS / PALS / NRP
Learn
Blog
Articles & updates
Deep Dive
In-depth clinical reviews
About
Our mission
Loading...
Echinococcosis (Hydatid Cyst Rupture)
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
Echinococcosis (Hydatid Cyst Rupture)
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 resuscitation priorities
Anaphylaxis recognition and treatment
▶
Urticaria, angioedema, bronchospasm, hypotension after known or suspected cyst rupture
▶
Epinephrine IM 0.3–0.5 mg (1:1000) immediately
Repeat at 5–15 minutes if inadequate response
IV access with two large-bore cannulas
▶
Crystalloid bolus 1–2 L IV for hypotension
Diphenhydramine 50 mg IV and ranitidine 50 mg IV adjuncts
Supine positioning with legs elevated unless respiratory distress
▶
Airway compromise may require sitting position
Monitor for biphasic reaction up to 72 hours
Hemodynamic stabilization targets
▶
MAP >= 65 mmHg
▶
Norepinephrine 0.1–0.3 mcg/kg/min if fluid-refractory hypotension
Vasopressin 0.03–0.04 units/min adjunct
SpO2 >= 94%
▶
High-flow oxygen 10–15 L/min via non-rebreather mask
Early intubation if airway compromise from angioedema
Continuous cardiac monitoring for dysrhythmia
▶
Kounis syndrome (coronary vasospasm from anaphylaxis) rare but life-threatening
Surgical emergency actions
Immediate surgical consultation
▶
Intraperitoneal rupture is operative emergency
▶
Peritonitis with free fluid on POCUS triggers immediate OR
Damage control surgery principles if unstable
Biliary tree rupture indication for urgent ERCP or surgery
▶
Obstructive jaundice with cholangitis requires urgent biliary decompression
Pulmonary cyst rupture with respiratory failure
▶
Pleural drainage and thoracic surgical consultation
Anti-spillage and antihelminthic initiation
▶
Albendazole 400 mg PO BID started immediately in ED
▶
Goal: prevent secondary peritoneal seeding (secondary hydatidosis)
Fatty meal co-administration improves absorption significantly
Hypertonic saline (20%) kept available for intraoperative scolex ablation
▶
Irrigate peritoneal cavity intraoperatively to kill protoscoleces
Risk of hypernatremia and sclerosing cholangitis if biliary leak
Monitoring and escalation triggers
Escalation triggers
▶
Recurrent anaphylaxis or refractory bronchospasm
▶
ICU admission and continuous epinephrine infusion
Anesthesia or critical care consult
Signs of peritonitis
▶
Diffuse guarding, rigidity, rebound tenderness
Immediate surgical escalation
Septic shock from secondary infection of cyst contents
▶
Broad-spectrum antibiotics within 1 hour
Lactate > 2 mmol/l with organ dysfunction triggers sepsis bundle
History
Presenting symptoms
Core symptom complex
▶
Acute severe abdominal pain
▶
Most common presenting complaint
Sudden onset, may radiate to right shoulder if diaphragm irritated
Anaphylaxis symptoms
▶
Urticaria and pruritus
Angioedema of lips, tongue, pharynx
Dyspnea and wheezing
Syncope or near-syncope
Nausea and vomiting
▶
Peritoneal irritation
Vagal response to pain
Rupture type-specific symptoms
▶
Intraperitoneal rupture
▶
Acute abdomen with diffuse peritonitis
Sudden urticaria accompanying abdominal pain is pathognomonic
Biliary rupture
▶
Jaundice, dark urine, pale stools
Fever and rigors if secondary cholangitis (Charcot's triad)
Pulmonary cyst rupture
▶
Sudden-onset chest pain and dyspnea
Vomica: expectoration of salty fluid with grape-skin membranes
Hemoptysis if vascular involvement
Epidemiological history
Geographic and travel exposure
▶
Residence in or travel to endemic regions
▶
South America, Eastern Europe, Russia, Middle East
Central Asia, China, East Africa, Australia, Mediterranean
Duration and recency of exposure
▶
Incubation period typically months to years after egg ingestion
Lifelong risk after settling in endemic area
Occupational and animal contact
▶
Sheep or cattle farming
▶
Close contact with dogs that consume infected viscera
Slaughterhouse work
Veterinary work or animal herding
▶
Dog ownership in rural sheep-raising communities
Consumption of contaminated water, soil, or unwashed raw produce
Prior cyst history
▶
Prior diagnosis of hepatic or pulmonary cysts on imaging
▶
Previously incidentally found cysts are common
Prior surgery for hydatid disease
▶
Significant recurrence rate after surgical resection
Unexplained eosinophilia on previous blood work
▶
May suggest occult cyst leakage before rupture
Risk factors for rupture
Cyst characteristics
▶
Large cysts > 5 cm diameter
▶
Higher intracystic pressure and wall tension
Superficial or subcapsular hepatic location
▶
Less hepatic parenchyma buffering external forces
Calcification of cyst wall (may indicate transition)
Precipitating events
▶
Blunt abdominal trauma, even minor
▶
Falls, motor vehicle collision, direct blow
Heavy lifting or straining
Spontaneous rupture without identifiable trigger
▶
Occurs in up to 30% of cases
Past medical history
Relevant comorbidities
▶
Prior abdominal surgery or known hepatic mass
Chronic liver disease affecting surgical candidacy
Bone marrow disorders affecting albendazole tolerability
Immunosuppression altering cyst behavior and serologic response
Medication history
▶
Prior albendazole or mebendazole courses
▶
Duration, response, and tolerability
Anticoagulants affecting surgical planning
Corticosteroid use potentially masking presentation
Physical Exam
Vitals and hemodynamic assessment
Stability snapshot
▶
Blood pressure
▶
Hypotension (SBP < 90 mmHg) in up to 75% of intraperitoneal rupture cases
Anaphylactic shock pattern: distributive, warm peripheries initially
Heart rate
▶
Tachycardia universal in hemodynamically significant rupture
Bradycardia may indicate vasovagal response or Kounis syndrome
Respiratory rate
▶
Tachypnea from bronchospasm, pain, or pleural involvement
Temperature
▶
Fever suggests secondary infection of ruptured cyst or cholangitis
SpO2
▶
Desaturation with pulmonary cyst rupture or severe bronchospasm
Skin and allergic manifestations
Cutaneous allergic signs
▶
Urticaria
▶
Generalized hives from systemic antigen release
Pathognomonic when accompanying acute abdominal pain
Angioedema
▶
Periorbital, labial, and laryngeal involvement
Stridor indicates impending airway compromise
Flushing and erythema
▶
Mast cell degranulation from antigenic cyst fluid
Pallor and diaphoresis
▶
Hemodynamic compromise marker
Abdominal examination
Peritoneal signs
▶
Diffuse or RUQ tenderness
▶
Localized initially, progresses to diffuse with peritoneal soiling
Guarding and rigidity
▶
Involuntary guarding is a high-specificity finding for peritonitis
Rebound tenderness
▶
Blumberg sign positive
Hepatomegaly or palpable mass
▶
Present in large cysts or prior known disease
Bowel sounds diminished or absent
▶
Ileus from peritoneal irritation
Biliary signs
▶
Jaundice
▶
Scleral icterus and skin yellowing
Indicates biliary communication or obstruction
Murphy's sign
▶
RUQ tenderness with inspiration if cholecystitis overlap or biliary rupture
Respiratory examination
Pulmonary findings
▶
Wheezing
▶
Bronchospasm from anaphylaxis or pulmonary cyst rupture
Decreased breath sounds unilaterally
▶
Pleural effusion or pneumothorax from pulmonary cyst rupture
Dullness to percussion
▶
Pleural effusion or hydropneumothorax
Crackles
▶
Aspiration of cyst contents or secondary pneumonia
PITFALLS
Diagnostic pitfalls
▶
Anaphylaxis without abdominal pain as sole presentation
▶
Occult hydatid rupture in endemic-area patient with unexplained anaphylaxis
No prior known allergy history should heighten suspicion
Jaundice attributed to other hepatobiliary cause
▶
Biliary rupture may mimic choledocholithiasis or cholangitis
Peritonitis attributed to other cause without imaging
▶
Daughter cysts on CT or ultrasound clinch diagnosis
Differential Diagnosis
Life-threatening diagnoses
Anaphylaxis from other causes
▶
Drug-induced anaphylaxis
▶
Medication exposure within minutes to 1 hour
ICD-10 T78.2 anaphylactic shock
Food-induced anaphylaxis
▶
Peanut, shellfish, tree nut exposure
No abdominal mass on imaging
Insect sting anaphylaxis
▶
Hymenoptera exposure history
Acute abdomen from other cause
▶
Perforated peptic ulcer
▶
ICD-10 K27.1
Free air under diaphragm on upright CXR
No cystic lesion on imaging
Acute appendicitis with perforation
▶
ICD-10 K35.2
RLQ pain migration pattern
Ruptured ectopic pregnancy
▶
Positive beta-hCG in women of reproductive age
No cystic hepatic lesion
Septic shock
▶
Pyogenic hepatic abscess
▶
ICD-10 K75.0
Fever, leukocytosis, no anaphylaxis
Ascending cholangitis
▶
ICD-10 K83.0
Charcot's triad without cyst imaging finding
Close mimics of echinococcal disease
Hepatic cystic lesions
▶
Simple hepatic cyst rupture
▶
No daughter cysts, no anaphylaxis, no protoscoleces
Polycystic liver disease
▶
Multiple cysts, family history, no serologic positivity
Hepatic adenoma rupture
▶
ICD-10 D13.5
Oral contraceptive use, solid component on MRI
Ruptured hepatocellular carcinoma
▶
ICD-10 C22.0
Cirrhosis background, elevated AFP, solid mass
Parasitic and infectious differentials
▶
Alveolar echinococcosis (Echinococcus multilocularis)
▶
ICD-10 B67.5
Tumor-like infiltrative hepatic lesion without true cyst wall
Far more aggressive biological behavior
Amebic hepatic abscess
▶
ICD-10 A06.4
Travel to tropical regions, Entamoeba serology positive
Responds to metronidazole
Cysticercosis
▶
ICD-10 B69.0
Taenia solium exposure, calcified CNS cysts more common
Serologic cross-reactivity with Echinococcus
Laboratory Tests
Allergy and anaphylaxis markers
Serum tryptase
▶
Elevated within 1–3 hours of mast cell degranulation
▶
Supports anaphylaxis diagnosis
Peak at 1 hour, returns to baseline by 6 hours
Collect during acute episode if possible
Repeat at 24 hours as baseline comparator
Complete blood count
▶
Eosinophilia
▶
Peripheral eosinophilia associated with cyst leakage and allergic response
May be absent in 25–40% of cases
Leukocytosis
▶
Secondary infection of ruptured cyst or cholangitis
Anemia
▶
Hemorrhagic rupture with hemoperitoneum
Hepatobiliary and metabolic labs
Comprehensive metabolic panel
▶
Bilirubin elevated in biliary rupture
▶
Conjugated hyperbilirubinemia with biliary obstruction
Alkaline phosphatase and GGT
▶
Elevated with biliary communication or cholangitis
Transaminases
▶
Mild to moderate elevation with hepatic parenchymal involvement
Creatinine and electrolytes
▶
Baseline for IV contrast and albendazole dosing
Hyponatremia if massive peritoneal fluid accumulation
Coagulation studies
▶
PT/INR and aPTT
▶
Pre-operative assessment mandatory
DIC risk in severe septic shock
Serologic and microbiologic tests
Echinococcus serology
▶
IgG ELISA
▶
First-line serologic test
Sensitivity 80–100% for active hepatic cysts
Lower sensitivity for pulmonary or calcified inactive cysts
Immunoelectrophoresis with arc 5 band (Weinberg test)
▶
High specificity for E. granulosus
Confirmatory when ELISA positive
Negative serology does not exclude disease
▶
Intact cysts may be seronegative
Available through CDC reference laboratories
Sepsis markers
▶
Lactate
▶
>= 2 mmol/l indicates organ hypoperfusion
Repeat at 2 hours if elevated
Blood cultures
▶
Two sets before antibiotics if secondary infection suspected
Procalcitonin
▶
Elevated in bacterial superinfection of ruptured cyst
Type and crossmatch
▶
Anticipate surgical hemorrhage
At least 4 units packed red blood cells available pre-operatively
Albendazole monitoring labs
CBC every 2 weeks during therapy
▶
Risk of neutropenia and agranulocytosis
▶
Neutrophil count < 1.0 x 10^9/L requires dose reduction or cessation
Thrombocytopenia monitoring
LFTs every 2 weeks during therapy
▶
Risk of hepatotoxic reaction
▶
ALT > 5 times upper limit of normal requires drug cessation
Biliary enzyme elevation assessment
Diagnostic Tests
Scoring Systems
WHO-IWGE cyst classification (CE1–CE5)
▶
CE1: Active phase, unilocular anechoic cyst with double-line sign
▶
Highly viable cysts with intact germinal layer
PAIR is an option for uncomplicated CE1
CE2: Active phase, multivesicular cyst with daughter cysts (honeycomb)
▶
High viability and high risk of rupture
CE3a: Transitional phase, cyst with detached endocyst membrane (water-lily sign)
▶
CE3a indicates early rupture or degeneration
CE3b contains daughter cysts; higher relapse rate
CE4: Inactive phase, heterogeneous matrix without daughter cysts
▶
Low or absent viability
CE5: Inactive phase, calcified cyst wall
▶
Usually requires no treatment unless symptomatic
Classification guides treatment modality selection
▶
Active stages (CE1, CE2, CE3) favor surgical or PAIR intervention
Inactive stages (CE4, CE5) may be monitored
MRI
MRI abdomen indications
▶
Superior biliary communication assessment
▶
Cystobiliary fistula detection: sensitivity superior to CT
Critical pre-operative information for surgical planning
Cyst characterization when CT equivocal
▶
Intermediate T1 signal with proteinaceous debris
T2 hypointense rim (pericyst) is characteristic
Detached germinal membrane on T2-weighted imaging
▶
Water-lily appearance confirming rupture
MRCP for biliary tree evaluation
▶
Non-invasive alternative to ERCP in stable patients
Delineates biliary anatomy before surgical intervention
MRI limitations
▶
Unstable patients: contraindicated due to monitoring constraints
Availability and time constraints in emergency setting
Motion artifact from pain and respiratory rate
CT
CT abdomen and pelvis with IV contrast
▶
Primary indication in rupture
▶
Confirms extent of rupture and free fluid
Identifies daughter cysts in peritoneal cavity
Cyst wall discontinuity is hallmark of rupture
Peritoneal seeding assessment
▶
Secondary hydatidosis: multiple peritoneal implants
Distribution and volume of implants guide surgical extent
Calcification pattern
▶
Calcified cyst wall may indicate prior or ongoing CE5 stage
Peripheral eggshell calcification
CT chest indications
▶
Pulmonary involvement workup
▶
Cyst morphology: air-fluid level within cyst (water-lily sign)
Pneumothorax, hydropneumothorax, or pleural effusion
Diaphragmatic involvement assessment
▶
Transdiaphragmatic rupture between hepatic and pulmonary cavities
CT-guided interventions
▶
Not indicated for ruptured cysts (spillage risk)
Role limited to pre-operative planning and drainage of secondary collections
Ultrasound
Abdominal ultrasound (first-line imaging for hepatic CE)
▶
Reference standard for hepatic cyst staging
▶
WHO-IWGE classification applied by ultrasound morphology
Sensitivity approaches 90–95% for hepatic cysts
Rupture findings on ultrasound
▶
Discontinuous cyst wall
Floating collapsed membranes (water-lily sign)
Free intraperitoneal fluid with echogenic particles
Daughter cysts outside the parent cyst
Limitations
▶
Operator-dependent
Gas-containing bowel may obscure cyst margins
POCUS in emergency setting
▶
Free fluid detection (FAST protocol)
▶
Morison's pouch, splenorenal recess, pelvis
Quantify hemoperitoneum or cyst fluid spillage
Biliary assessment
▶
Common bile duct dilation indicating obstruction
Intrahepatic biliary dilation pattern
Cardiac POCUS
▶
LV function in distributive shock
Pericardial effusion if cardiac hydatid cyst present (rare, approx 1% of cases)
Disposition
Admission and surgical criteria
All ruptured hydatid cysts require hospital admission
▶
No safe outpatient management of confirmed or suspected rupture
▶
Risk of anaphylaxis relapse (biphasic reaction) up to 72 hours
Risk of peritonitis progression
Surgical consultation mandatory for all intraperitoneal ruptures
▶
Operative intervention typically within hours of diagnosis
Biliary rupture
▶
GI or hepatobiliary surgical consultation
ERCP team notification for sphincterotomy and stenting
Level of care determination
ICU criteria
▶
Refractory anaphylaxis or anaphylactic shock
▶
Vasopressor requirement
Ongoing bronchospasm requiring continuous nebulizers
Septic shock from secondary infection
▶
Lactate >= 2 mmol/l with organ dysfunction
Norepinephrine infusion requirement
Post-operative monitoring after emergency laparotomy
▶
Hemorrhagic or septic complications
Respiratory failure requiring mechanical ventilation
Step-down or general surgical ward
▶
Hemodynamically stable after resuscitation
▶
No vasopressor requirement
Tolerating oral medications
Albendazole initiation and monitoring required
Infectious disease or tropical medicine consultation recommended
Transfer criteria
Indications for transfer to tertiary center
▶
Complex hepatobiliary surgery required
▶
Hepatic resection planning
Complex biliary reconstruction
No in-house hepatobiliary or thoracic surgery capability
Pediatric transfer for definitive surgical management in children
Ensure hemodynamic stability before interfacility transfer
▶
Transfer with epinephrine and airway equipment available
Treatment
Anaphylaxis management
First-line treatment
▶
Epinephrine IM 0.3–0.5 mg (1:1000 solution)
▶
Anterolateral mid-thigh injection preferred
Repeat every 5–15 minutes if inadequate response
Maximum 3 doses IM before IV route consideration
IV epinephrine infusion for refractory anaphylaxis
▶
0.1–1 mcg/kg/min titrated to hemodynamic response
ICU monitoring mandatory
Adjunctive therapies
▶
Diphenhydramine 25–50 mg IV or IM
▶
H1 blocker reduces urticaria and angioedema
Not first-line, never replaces epinephrine
Ranitidine 50 mg IV or famotidine 20 mg IV
▶
H2 blocker adjunct
Methylprednisolone 125 mg IV or hydrocortisone 200 mg IV
▶
Reduces biphasic reaction risk
Onset delayed 4–6 hours
Salbutamol 2.5–5 mg nebulized for bronchospasm
▶
Adjunct to epinephrine for lower airway obstruction
Antihelminthic therapy
Albendazole (first-line)
▶
Adults >= 60 kg: 400 mg PO BID with fatty meal
▶
28-day cycles with 14-day drug-free intervals (FDA label)
Current expert consensus supports continuous dosing in peri-rupture period
Duration: 1–6 months post-surgery depending on response
Adults < 60 kg: 15 mg/kg/day PO divided BID
▶
Maximum daily dose 800 mg
Initiate immediately in ED to prevent secondary peritoneal seeding
▶
Cyst fluid seeding of peritoneum creates secondary hydatidosis
Most critical window is peri-operative period
Absorption enhanced by fatty meals
▶
Avoid fasting administration
Alternative antihelminthic
▶
Mebendazole 40–50 mg/kg/day PO divided TID
▶
Second-line when albendazole not available
Inferior oral bioavailability compared to albendazole
Also enhanced by fatty meal co-administration
Contraindications and precautions
▶
Albendazole contraindicated in first trimester of pregnancy
Monitoring CBC and LFTs every 2 weeks throughout treatment
Hepatotoxicity requires dose interruption or cessation
Surgical management
Intraperitoneal rupture
▶
Emergency laparotomy
▶
Aspiration of cyst contents with large-bore sucker
Intraoperative scolicidal agent instillation: hypertonic saline 20%
Leave for minimum 10 minutes before aspiration
Pericystectomy (total or partial) or hepatic resection
▶
Extent depends on cyst location and hepatic reserve
Peritoneal lavage with hypertonic saline
▶
Eliminate daughter cysts from peritoneal cavity
Drain placement for peritoneal contamination
Biliary rupture
▶
ERCP with sphincterotomy and stenting
▶
Decompress biliary tree before or instead of surgery in stable patients
Remove daughter cysts from common bile duct
Surgical common bile duct exploration if ERCP fails
T-tube drainage
Pulmonary cyst rupture
▶
Thoracoscopic or open cystectomy
▶
Capitonnage (closure of remaining cavity) preferred
Bronchopleural fistula management
▶
May require lobectomy in complex cases
Post-operative albendazole continuation
PAIR procedure (not for ruptured cysts)
▶
Puncture-Aspiration-Injection-Re-aspiration
▶
Contraindicated in ruptured cysts
Contraindicated when biliary communication present
Used for intact uncomplicated CE1 or CE3a cysts
Infection control and antibiotics
Antibiotics for secondary infection
▶
Piperacillin-tazobactam 4.5 g IV every 6 hours
▶
First-line for biliary or peritoneal contamination
Gram-negative and anaerobic coverage
Alternative: ceftriaxone 2 g IV daily plus metronidazole 500 mg IV every 8 hours
▶
Biliary penetration for cholangitis management
If septic shock: broaden to carbapenem (meropenem 1 g IV every 8 hours)
▶
Duration: 5–14 days depending on source control adequacy
Prophylactic antibiotics
▶
Cefazolin 1–2 g IV single dose pre-operative
No evidence for routine prophylactic antibiotics absent secondary infection
Corticosteroid and prolonged allergy management
Prolonged corticosteroid course for eosinophilic or systemic allergic response
▶
Prednisone 40–60 mg PO daily tapered over 2–4 weeks
▶
When ongoing eosinophilia-related organ dysfunction
Consult infectious disease or allergy/immunology
Not routine for all rupture cases
Special Populations
Pregnancy
Physiologic considerations
▶
Increased intraabdominal pressure and cyst compression risk
▶
Third trimester highest mechanical rupture risk
Immunologic tolerance of pregnancy may alter serologic response
▶
Serology less reliable in pregnancy
Antihelminthic safety
▶
Albendazole contraindicated in first trimester
▶
Teratogenic in animal models; insufficient human safety data
FDA Pregnancy Category C (old classification)
Second and third trimester: weigh benefit-risk carefully
▶
Defer elective albendazole therapy to post-partum if cyst stable
Emergency rupture may justify use after first trimester with specialist guidance
Mebendazole similarly teratogenic risk profile
Surgical considerations
▶
Surgery in pregnancy for ruptured cyst is generally required regardless of trimester
▶
Maternal life takes priority
Obstetric and maternal-fetal medicine consultation
Fetal heart rate monitoring peri-operatively when viable
Regional anesthesia preferred when feasible
Imaging
▶
Ultrasound is imaging modality of choice in pregnancy
▶
No ionizing radiation risk to fetus
MRI without gadolinium acceptable when ultrasound insufficient
▶
Avoid gadolinium contrast in pregnancy unless mandatory
CT only when life-threatening emergency mandates it
▶
Fetal radiation dose counseling required
Geriatric
Atypical presentation
▶
Blunted anaphylaxis response in older adults
▶
Beta-blocker use may attenuate tachycardia and mask severity
Epinephrine still first-line; glucagon 1–2 mg IV if beta-blocked
Higher baseline comorbidity affecting surgical risk
▶
Cardiac and pulmonary reserve assessment critical
Drug considerations
▶
Albendazole hepatotoxicity risk higher with pre-existing liver disease
▶
Careful baseline LFT assessment and more frequent monitoring
Renal adjustment for antibiotics
▶
Piperacillin-tazobactam: GFR-based dose adjustment
Polypharmacy interaction review
▶
Albendazole is CYP3A4 inducer; interaction with anticoagulants
Surgical risk modification
▶
High-risk patients may be candidates for non-operative management
▶
Interventional radiology drainage of contained rupture
Multidisciplinary team decision
Frailty assessment influences disposition and post-operative care needs
Admission to geriatric surgery or high dependency unit preferred
Pediatrics
Epidemiology in children
▶
Children represent up to 40% of cases in highly endemic regions
▶
Most symptomatic cases present in ages 5–15 years
Rupture less common in children due to smaller cyst size at presentation
Antihelminthic dosing
▶
Albendazole 15 mg/kg/day PO divided BID
▶
Maximum 800 mg/day
Administer with fatty meal for absorption
Same monitoring intervals: CBC and LFTs every 2 weeks
Surgical approach
▶
Children generally tolerate surgery well
▶
Cyst-preserving conservative surgery preferred to avoid hepatic resection
Pediatric surgery consultation essential
Spill precautions same as adults
▶
Hypertonic saline scolex ablation intraoperatively
Anaphylaxis dosing
▶
Epinephrine IM 0.01 mg/kg (1:1000) up to 0.5 mg maximum per dose
▶
Weight-based dosing mandatory
Anterolateral mid-thigh injection
Diphenhydramine 1 mg/kg IV up to 50 mg maximum
Imaging preference
▶
Ultrasound first-line to avoid radiation
▶
CT only when ultrasound insufficient and emergency planning required
Background
Epidemiology
Global burden
▶
Cystic echinococcosis (CE) endemic in 100+ countries
▶
Estimated 1–3 million cases worldwide at any time
Global burden estimated at 1–3 million DALYs annually
Highest incidence in sheep-raising and cattle-farming regions
▶
South America (Argentina, Uruguay, Peru), Mediterranean basin
Central Asia, China, Eastern Europe, East Africa
Annual incidence 1–200 per 100,000 population in endemic zones
Demographics
▶
Most symptomatic cases in adults aged 21–40 years in endemic areas
▶
Long latency from infection (egg ingestion) to clinical presentation
Children up to 40% of cases in highly endemic regions
Equal sex distribution overall; occupational exposure creates male predominance in some cohorts
Rupture incidence
▶
Spontaneous or trauma-induced rupture occurs in 5–25% of CE cases
▶
Intraperitoneal rupture is the most common and most dangerous
Biliary rupture is most common form of complication overall
Mortality from ruptured hydatid cyst: 1–10% with treatment; higher without
Secondary hydatidosis (peritoneal seeding) occurs in 10–30% of intraperitoneal ruptures not treated with anti-scolicidal agents
Pathophysiology
Parasite lifecycle
▶
Definitive host: Canis lupus familiaris (dog) and other canids
▶
Adult Echinococcus granulosus tapeworm lives in small intestine
Eggs shed in feces contaminate water, soil, vegetation
Intermediate host: sheep, cattle, humans (dead-end host)
▶
Humans ingest eggs via contaminated food, water, or fomites
Oncosphere (hexacanth embryo) penetrates intestinal wall
Hepatic and pulmonary tropism
▶
Liver: first-pass organ, 70–80% of human CE
Lungs: second filter, 15–20% of human CE
Other sites (brain, bone, kidney, spleen): < 5%
Cyst development
▶
Three-layer cyst structure
▶
Pericyst: host-derived outer fibrotic layer
Ectocyst (laminated membrane): parasite-derived, outer
Germinal layer (endocyst): inner living parasite epithelium producing daughter cysts and protoscoleces
Protoscoleces: juvenile tapeworm heads, highly antigenic
▶
Release into host cavity triggers massive IgE-mediated response
Hydatid sand: mixture of protoscoleces, free hooklets, and brood capsules
Rupture consequences
▶
Anaphylaxis: sudden release of highly antigenic cyst fluid
▶
IgE-mediated mast cell degranulation systemically
Secondary hydatidosis: peritoneal or pleural seeding with viable protoscoleces
▶
Each protoscolex can develop into a new cyst
Seeding causes disseminated disease if not treated
Chemical peritonitis from irritant cyst fluid
Biliary obstruction and cholangitis from daughter cysts in biliary tree
Therapeutic Considerations
Antihelminthic therapy rationale
▶
Albendazole penetrates cyst wall via hydrophilic diffusion
▶
Active metabolite albendazole sulfoxide is scolicidal
Reaches 10–20% of plasma concentration within cyst fluid
Pre-operative albendazole reduces cyst viability
▶
Minimum 4 days recommended before elective surgery
May not be achievable in emergency rupture setting
Post-operative continuation mandatory to prevent recurrence
▶
Duration 1–6 months per WHO recommendation
Longer duration for secondary hydatidosis
Surgical principles
▶
Radical surgery (total pericystectomy or hepatic resection) reduces recurrence
▶
Recurrence rate after conservative surgery: 10–30%
Recurrence after radical surgery: < 5%
Anti-scolicidal agent contact time critical
▶
Hypertonic saline 20% minimum 10 minutes contact
Alternative: cetrimide 0.5% or 70% ethanol
Risk of sclerosing cholangitis if biliary communication present: avoid hyperosmolar solutions
Laparoscopic approach for selected uncomplicated cases
▶
Not recommended in rupture scenario due to spillage risk
PAIR rationale and limitations
▶
Percutaneous aspiration with scolicidal agent injection for uncomplicated cysts
▶
Effective for CE1 and CE3a stages
Contraindicated in rupture: risk of anaphylaxis and peritoneal seeding
WHO/IWGE guidelines support PAIR as alternative to surgery for uncomplicated CE
Monitoring post-treatment
▶
Ultrasound follow-up every 3–6 months for 2 years post-treatment
▶
Cyst regression stages E toward CE4/CE5 indicate therapeutic success
Serology may remain positive for years after successful treatment
▶
Not reliable marker of cure; imaging-based follow-up preferred
Patient Discharge Instructions
copy discharge instructions
Copy
Echinococcosis (hydatid cyst) — home care after treatment
▶
Take all antiparasitic medication (albendazole) exactly as prescribed
▶
Always take with a fatty meal (eggs, milk, peanut butter) to improve absorption
Do not stop taking without medical advice even if feeling better
Return for blood test monitoring every 2 weeks while on medication
▶
Medication can affect your liver and blood counts
Avoid heavy lifting or strenuous activity until cleared by surgeon
Keep all surgical follow-up appointments
Allergy warning after rupture
▶
You had a severe allergic reaction (anaphylaxis) during your illness
▶
Carry an epinephrine auto-injector (EpiPen) as prescribed until specialist clears you
Wear medical alert identification stating history of hydatid cyst rupture and anaphylaxis
Biphasic reactions can occur up to 72 hours after the initial event
Warning signs to return to the emergency department immediately
▶
Sudden severe hives or swelling of face, lips, or throat
Difficulty breathing or swallowing
Sudden severe abdominal pain
Yellowing of skin or eyes (jaundice)
High fever with shaking chills
Dizziness or fainting
Nausea, vomiting that cannot be controlled
Any new or worsening symptoms that concern you
Follow-up appointments
▶
Surgeon follow-up within 1–2 weeks post-discharge
Infectious disease or tropical medicine specialist within 2–4 weeks
Ultrasound abdomen every 3–6 months for 2 years to monitor cyst regression
Repeat blood tests (CBC and liver function) every 2 weeks while on albendazole
Preventing reinfection
▶
Avoid close contact with dogs in sheep-farming areas without hand hygiene
Wash hands thoroughly after contact with dogs or farm animals
Wash all fruits and vegetables thoroughly before eating
Avoid consuming potentially contaminated water from rural or farm water sources
Do not allow dogs to consume raw sheep, cattle, or goat organs
References
Guidelines and key sources
WHO Informal Working Group on Echinococcosis (WHO-IWGE)
▶
WHO-IWGE cyst classification CE1–CE5 for staging and treatment guidance
PAIR guideline: indications, contraindications, and procedural protocol
WHO Technical Report Series 993: Echinococcosis
International guidelines
▶
European Association for the Study of the Liver (EASL) clinical practice guidelines on echinococcosis
WHO-IWGE consensus guidelines on treatment of uncomplicated CE
Key references for emergency management
▶
Anaphylaxis management: World Allergy Organization (WAO) Anaphylaxis Guidelines 2020
Surviving Sepsis Campaign guidelines for septic shock management
Coding standards
▶
ICD-10 B67.0: Echinococcus granulosus infection of liver
ICD-10 B67.1: Echinococcus granulosus infection of lung
ICD-10 B67.2: Echinococcus granulosus infection of bone
ICD-10 B67.8: Echinococcus granulosus infection, other and multiple sites
ICD-10 B67.9: Echinococcus granulosus infection, unspecified
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.
← Management Protocols
Home
Management Protocols
Echinococcosis (Hydatid Cyst Rupture)