Retropharyngeal abscess (RPA) is a potentially life-threatening deep neck space infection occurring in the space between the posterior pharyngeal wall and the prevertebral fascia. It predominantly affects children under 5 years (median age ~3 years) due to the presence of retropharyngeal lymph nodes that atrophy after age 5. [1-3] In adults, RPA is rare and typically associated with immunocompromise, foreign body ingestion, or trauma. [4] The incidence has been increasing, with a rising prevalence of MRSA as a causative organism. [5]
1. History
- Chief complaints: Neck pain/stiffness (38%), fever (17–70%), sore throat/odynophagia (17%), neck mass/swelling (16%), refusal to eat/decreased oral intake [1][3]
- Symptom characterization: Difficulty swallowing, drooling, muffled/"hot potato" voice, neck held in extension or torticollis [1][6]
- Timing: Often preceded by an upper respiratory infection, pharyngitis, or otitis media days prior; may follow dental infection or foreign body ingestion in adults [4][7]
- Progression: Symptoms typically worsen over 2–5 days; failure to improve on oral antibiotics for pharyngitis should raise suspicion [8]
- Important negatives: Stridor and respiratory distress are uncommon at presentation (~5%), which can lead to delayed diagnosis [1][3]
2. Alarm Features
- Stridor, respiratory distress, or drooling — suggests airway compromise [1][7]
- Toxic appearance, high fever, rigors — concern for sepsis or mediastinal extension [2][9]
- Rapidly progressive neck swelling — risk of airway obstruction; retropharyngeal abscesses caused upper airway obstruction in 36% of adult cases in one series [10]
- Bilateral neck swelling or chest pain — suggests descending necrotizing mediastinitis (mortality ~40%) [10-11]
- Persistent/worsening symptoms despite antibiotics — concern for abscess formation requiring drainage [2]
- Trismus — suggests parapharyngeal extension [4]
- Unilateral neck tenderness along the SCM with persistent fever — consider Lemierre syndrome (IJV thrombophlebitis) [12]
3. Medications
- Empiric IV antibiotics should cover Group A Streptococcus, Staphylococcus aureus (including MRSA), and anaerobes: [5][7][13]
- First-line: Ampicillin-sulbactam (Unasyn) OR clindamycin monotherapy
- Preferred combination (especially if MRSA concern): Ceftriaxone + clindamycin — this was the most common effective regimen in a large pediatric series [5]
- Alternative: Penicillin G + metronidazole (for non-MRSA settings) [13-14]
- Severe/complicated: Piperacillin-tazobactam or meropenem for extensive disease [14]
- Adjunctive corticosteroids (e.g., dexamethasone) have been used to reduce inflammation and may shorten hospital stay, though evidence is limited [15]
- Avoid: Oral antibiotics alone are insufficient for confirmed abscess; IV therapy is standard [8][16]
- Duration: Typically 2–4 weeks total (IV transitioned to oral), with median total antibiotic duration ~19–21 days [16-17]
4. Diet
- NPO if airway compromise is suspected or surgical drainage is planned
- Soft/liquid diet as tolerated; many children present with decreased oral intake and odynophagia
- Assess and correct dehydration with IV fluids
- In adults, foreign body ingestion (fish bones, chicken bones) is a common precipitant — dietary counseling on careful eating may be relevant [4]
5. Review of Systems
- HEENT: Sore throat, dysphagia, odynophagia, voice change, otalgia, trismus, drooling
- Respiratory: Stridor, noisy breathing, snoring (new-onset sleep apnea has been reported), cough, dyspnea [18]
- Neck: Pain, stiffness, swelling, torticollis, limited range of motion
- Constitutional: Fever, malaise, irritability, poor feeding (infants)
- GI: Nausea, vomiting, decreased oral intake
- Pulmonary/systemic: Chest pain, pleurisy (if mediastinal extension or Lemierre syndrome with septic emboli) [12]
6. Collateral History and Family History
- Collateral: Recent URI, pharyngitis, otitis media, dental procedures, or foreign body ingestion; prior antibiotic use (a return ED visit within 1 week is associated with surgically significant abscess) [19]
- Immunocompromise: HIV status, diabetes, immunosuppressive medications — particularly relevant in adults [4][20]
- Family history: Generally not contributory, though recurrent deep neck infections should prompt evaluation for congenital anomalies (e.g., branchial cleft fistula) [21]
7. Risk Factors
- Age <5 years (retropharyngeal lymph nodes present) [1-2]
- Male sex (slight predominance) [3][16]
- Recent upper respiratory infection or pharyngitis [3]
- Immunocompromise (HIV, diabetes, chronic steroid use) — especially in adults [4][20]
- Foreign body ingestion or pharyngeal trauma — leading cause in adults [4]
- Dental/odontogenic infection [22]
- IVDU (in adults, associated with atypical organisms)
- Prior antibiotic use without improvement [19]
8. Differential Diagnosis
- Peritonsillar abscess — more common; unilateral tonsillar bulging, uvular deviation, trismus; typically older children/adults
- Parapharyngeal abscess — lateral neck swelling, medial displacement of tonsil; often requires transcervical drainage [20]
- Epiglottitis — similar presentation with fever, drooling, dysphagia, stridor; distinguished by direct visualization and lateral neck film [6]
- Calcific tendinitis of the longus colli — retropharyngeal fluid on imaging but afebrile, no leukocytosis; calcium deposits visible on CT [23]
- Cervical vertebral osteomyelitis/discitis — retropharyngeal fluid with vertebral body changes on imaging [4][23]
- Kawasaki disease / MIS-C — cervical lymphadenopathy with fever; should be considered in pediatric patients [24]
- Lemierre syndrome — pharyngitis progressing to IJV thrombophlebitis and septic emboli [12]
- Cervical lymphadenitis — reactive or suppurative; usually more superficial
- Retropharyngeal hematoma — post-traumatic or anticoagulated patients
- Malignancy (lymphoma, rhabdomyosarcoma) — in cases with atypical course [25]
9. Past Medical History
- Prior episodes of deep neck infection or peritonsillar abscess
- Recurrent pharyngitis or tonsillitis
- Diabetes mellitus (significant risk factor in adults; associated with worse outcomes) [4][26]
- HIV/immunodeficiency
- Recent dental work or oropharyngeal procedures
- History of congenital anomalies (branchial cleft fistula — associated with recurrence) [21]
10. Physical Exam
- Vitals: Fever (70%), tachycardia; monitor for signs of sepsis [3]
- General: Ill-appearing, irritable child; may hold neck in extension ("sniffing position") [6]
- Neck: Limited neck extension (45%), torticollis (36–54%), limited neck flexion (12.5%), cervical lymphadenopathy (77%), neck swelling/mass [1][3]
- Oropharynx: Posterior pharyngeal wall bulging (classic but not always visible); unilateral swelling suggests lateralized abscess [4]
- Drooling (8%), trismus [3-4]
- Stridor is rare (~5%) but indicates significant airway compromise [1][3]
- Palpation: Avoid aggressive palpation of the posterior pharynx — risk of abscess rupture and aspiration [7]
11. Lab Studies
- CBC with differential: Leukocytosis with left shift; WBC >15,000/μL is an independent predictor of PICU admission and need for surgery [9][19]
- CRP: Elevated; CRP >50 mg/L associated with PICU admission; CRP >10 associated with surgically significant abscess [9][19]
- Blood cultures: Should be obtained before antibiotics; positive in a minority but critical if bacteremia/sepsis suspected [27]
- BMP: Assess hydration status, glucose (rule out DM in adults)
- Wound/abscess culture: If surgical drainage performed — send for aerobic, anaerobic, and Gram stain in anaerobic transport [27]
- Procalcitonin: May help differentiate bacterial from viral etiology in ambiguous cases
12. Imaging
- Lateral soft tissue neck radiograph: Useful initial screening tool; sensitivity 84%, specificity 94% for retropharyngeal infection. Prevertebral soft tissue widening: >7 mm at C2 or >14 mm at C6 (children) / >22 mm at C6 (adults). Must be obtained in true lateral with neck in extension during inspiration to avoid false positives. Limited ability to distinguish abscess from cellulitis/edema [25][28]
- CT neck with IV contrast: Gold standard for confirming diagnosis, delineating extent, and guiding surgical decision-making. Key findings: rim-enhancing hypodense fluid collection, scalloped walls, gas within the collection (gas = abscess in all cases). PPV for abscess ~82–84%, but false positives occur. Cross-sectional area >2–3 cm² predicts need for surgery [1][25][29-32]
- MRI: Superior soft tissue contrast; better for detecting free fluid, intracranial complications, and skull base involvement; useful when CT is equivocal or to reduce radiation in children [24][33-34]
- Ultrasound: Limited role for deep neck space infections; may miss retropharyngeal collections; higher rate of repeat imaging [25]
13. Special Tests
- Flexible nasopharyngoscopy: Can visualize posterior pharyngeal bulging; performed by ENT
- Intraoperative findings: Definitive confirmation — presence of purulent material on incision and drainage
- D-zone test: For clindamycin-inducible resistance in MRSA isolates [35]
- TB testing: Consider in endemic areas or immunocompromised patients (PPD/IGRA) [4]
14. ECG
- Not routinely indicated unless:
- Sepsis with hemodynamic instability
- Concern for pericarditis from mediastinal extension [11]
- Pre-operative assessment
- Electrolyte abnormalities from dehydration/poor intake
15. Assessment
RPA is a polymicrobial infection in most cases. The predominant organisms are Group A Streptococcus, Staphylococcus aureus (including MRSA in up to 64% of S. aureus isolates), and anaerobes (Prevotella, Fusobacterium, Peptostreptococcus). [5][7] More than two-thirds of deep neck abscesses harbor beta-lactamase-producing organisms. [7]
The distribution of organisms cultured from retropharyngeal/parapharyngeal abscesses compared to other deep neck locations is shown in the following figure:
Severity stratification
- Mild/Cellulitis: Prevertebral soft tissue thickening without defined fluid collection on CT → trial of IV antibiotics
- Moderate (small abscess <2–3 cm): Rim-enhancing collection on CT → IV antibiotics with close monitoring; ~35–50% can be managed medically [1][31-32]
- Severe: Large abscess (≥3 cm), airway compromise, mediastinal extension, sepsis, or failure to improve in 24–48 hours → surgical drainage [2][16][32]
Complications (cannot-miss)
- Airway obstruction (36% of retropharyngeal abscesses in one adult series) [10]
- Descending necrotizing mediastinitis (mortality ~40%) [11]
- Aspiration from spontaneous rupture [7]
- Lemierre syndrome (IJV septic thrombophlebitis) [12][27]
- Carotid artery erosion/pseudoaneurysm
- Epidural abscess, meningitis [37]
- Sepsis (mortality 4.8% in adults) [20]
16. Treatment Plan
Initial stabilization
- Airway first — prepare for difficult airway; avoid blind nasotracheal intubation; have surgical airway equipment available; intubation ideally in the OR with ENT present [38]
- IV access, fluid resuscitation, NPO
Antibiotic therapy
- Empiric IV regimen: Ceftriaxone (50 mg/kg/day, max 2g) + Clindamycin (30–40 mg/kg/day IV divided q8h) [5][13]
- Alternative: Ampicillin-sulbactam (200–400 mg/kg/day of ampicillin component divided q6h) [13]
- Penicillin-allergic: Clindamycin monotherapy or vancomycin + metronidazole
- Severe/complicated: Piperacillin-tazobactam or meropenem [14]
- Narrow antibiotics based on culture and sensitivity data
Surgical drainage
- Indications: Large abscess (≥3 cm), airway compromise, failure to improve on IV antibiotics within 24–48 hours, mediastinal extension, immunocompromised host [2][16][32]
- Approach: Transoral incision and drainage (preferred for uncomplicated RPA) vs. transcervical (for extensive disease or parapharyngeal extension) [20]
- Transoral approach has lower recurrence (5.6% vs. 27%) and complication rates compared to transcervical in one series [20]
- ~35–58% of patients can be managed with antibiotics alone without surgery [1][31]
17. Disposition
Admit all confirmed or suspected RPA
- All patients require IV antibiotics and close airway monitoring [8]
- ICU admission criteria: Stridor, respiratory distress, airway compromise, sepsis, mediastinal extension, post-operative monitoring in young infants [2][9][39]
- Predictors of PICU admission: dysphagia, trismus, tonsillar hypertrophy, WBC ≥15,000, CRP ≥50 mg/L [9]
Discharge criteria
- Afebrile for 24–48 hours
- Tolerating oral intake and oral antibiotics
- Improving clinically with decreasing neck swelling/pain
- Reliable follow-up arranged
Consultation triggers
- ENT/Otolaryngology — consult early for all suspected RPA [8]
- Pediatric surgery or interventional radiology if CT-guided drainage considered
- Infectious disease — for complicated cases, MRSA, or atypical organisms
- Anesthesiology — for airway management planning
18. Follow Up / Return Precautions
- Follow-up: ENT follow-up within 1 week of discharge; primary care within 2–3 days
- Total antibiotic duration: Typically 2–4 weeks (IV + oral transition) [16-17]
- Return immediately for: Worsening neck swelling, difficulty breathing, stridor, inability to swallow, high fever, drooling, or worsening neck stiffness
- Expected course: Most patients improve within 48–72 hours of appropriate therapy; median hospital stay is 2.6 days (medical) to 3.5 days (surgical) [31]
- Recurrence: Uncommon (~5–9% for RPA); recurrent infections should prompt evaluation for congenital anomalies (branchial cleft fistula) or immunodeficiency [20-21]
- Patient counseling: Emphasize completion of full antibiotic course; educate on signs of airway compromise
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