A 35-year-old woman from Delhi presents with a 3-day history of severe neck pain, fever (39.2°C), and progressive dysphagia. She reports a sore throat 1 week prior. On examination, she has a stiff neck, limited neck flexion, and bilateral neck swelling. Intraorally, the posterior pharyngeal wall appears bulged and erythematous. Neck X-ray shows widening of the prevertebral space (>6 mm at C3 level). Blood cultures are pending. What is the most appropriate next step in management?

Explanation

## Management of Retropharyngeal Abscess ### Clinical Diagnosis **Key Point:** This patient has a retropharyngeal abscess—a life-threatening deep neck space infection. The classic triad is: 1. Sore throat + fever 2. Neck stiffness (mimics meningitis) 3. Posterior pharyngeal wall bulging The widened prevertebral space on X-ray (>6 mm) is a key radiologic finding supporting the diagnosis. ### Why Immediate Imaging + Antibiotics + Surgical Readiness? **High-Yield:** Retropharyngeal abscess can rapidly progress to: - **Airway obstruction** (posterior wall swelling) - **Mediastinitis** (infection tracks down to chest) - **Sepsis** (bacteremia) - **Carotid sheath involvement** (hemorrhage) - **Atlantoaxial subluxation** (Grisel syndrome, rare) ### Management Algorithm ```mermaid flowchart TD A[Suspected retropharyngeal abscess]:::outcome --> B[Assess airway]:::decision B -->|Compromised| C[Intubate/Tracheostomy]:::urgent B -->|Patent| D[Start broad-spectrum IV antibiotics]:::action D --> E[Urgent CT or MRI neck]:::action E --> F{Abscess confirmed?}:::decision F -->|Yes| G[Surgical drainage + airway management]:::action F -->|No| H[Continue antibiotics, repeat imaging]:::action C --> D G --> I[Culture-directed therapy]:::action H --> I ``` ### Antibiotic Coverage **Mnemonic: SASA** — **S**treptococcus, **A**naerobes, **S**taphylococcus (including MRSA), **A**erobic gram-negatives | Organism | Frequency | Coverage | |----------|-----------|----------| | Group A Streptococcus | 40–50% | Cephalosporin, Penicillin | | Anaerobes (Peptostreptococcus, Prevotella, Fusobacterium) | 30–40% | Cefoxitin, Clindamycin | | Staphylococcus aureus | 10–20% | Cephalosporin (3rd gen) | | Gram-negative aerobes | 5–10% | Cephalosporin | **Recommended regimen:** Ceftriaxone (2 g IV Q12H) + Cefoxitin (2 g IV Q6H) or Clindamycin (600 mg IV Q6H) for anaerobic coverage. ### Why Option 0 Is Correct 1. **IV antibiotics immediately** — do not wait for culture; empiric broad-spectrum coverage is life-saving 2. **Urgent CT/MRI** — confirms diagnosis, defines extent, guides surgical approach 3. **Prepare for drainage** — most retropharyngeal abscesses require surgical intervention; intraoral drainage is preferred if localized; external approach if diffuse 4. **Airway readiness** — have intubation/tracheostomy equipment at bedside **Clinical Pearl:** Retropharyngeal abscess is NOT managed like peritonsillar abscess (which may resolve with antibiotics alone). It is a surgical disease until proven otherwise. ### Why Other Options Fail **Option 1 (Needle aspiration under local anesthesia):** Dangerous. Risk of: - Airway obstruction if swelling worsens - Aspiration of pus into airway - Incomplete drainage - Spread of infection - No anesthesia coverage for airway protection **Option 2 (Oral penicillin + observation):** Fatal error. Oral antibiotics do not achieve therapeutic levels in deep neck space abscesses. Observation allows rapid progression to airway obstruction, mediastinitis, or sepsis. **Option 3 (MRI brain first):** Wastes critical time. While meningitis is in the differential (neck stiffness), the posterior pharyngeal bulging and prevertebral space widening make retropharyngeal abscess far more likely. Imaging should be neck-focused (CT/MRI neck), not brain. Blood cultures will help differentiate. **High-Yield:** The key distinguishing feature between retropharyngeal and peritonsillar abscess is that retropharyngeal abscess is a surgical emergency requiring imaging and drainage, whereas peritonsillar abscess may respond to antibiotics ± needle aspiration. [cite:Cummings Otolaryngology 6e Ch 81]