A 28-year-old man presents to the ENT clinic with a 4-day history of severe sore throat, odynophagia, and fever (39.2°C). On examination, the right tonsil is enlarged, erythematous, and covered with yellowish exudate. The uvula is deviated to the left. Intraoral examination reveals trismus and a bulge in the soft palate above the right tonsil. The patient reports difficulty swallowing saliva and mild dyspnea. What is the most likely diagnosis?

Explanation

## Clinical Diagnosis: Peritonsillar Abscess ### Key Clinical Features **Key Point:** A peritonsillar abscess (PTA) is a collection of pus in the space between the tonsil capsule and the superior pharyngeal constrictor muscle, typically developing as a complication of acute tonsillitis. ### Diagnostic Criteria Present in This Case | Feature | Finding | Significance | |---------|---------|---------------| | **Uvula deviation** | Deviated to left (away from abscess) | Hallmark sign of PTA | | **Bulge in soft palate** | Above the tonsil | Indicates collection pushing palate medially | | **Trismus** | Present | Reflects inflammation of muscles of mastication | | **Dysphagia/odynophagia** | Severe | Indicates deep space involvement | | **Fever** | High (39.2°C) | Systemic response to abscess | ### Pathophysiology of PTA Formation 1. **Acute tonsillitis** → bacterial invasion (Group A Streptococcus most common) 2. **Suppuration** within tonsillar tissue 3. **Rupture** into peritonsillar space 4. **Abscess formation** between tonsil capsule and pharyngeal wall **High-Yield:** The **uvula deviation away from the affected side** is the single most specific clinical sign of peritonsillar abscess and distinguishes it from uncomplicated tonsillitis. ### Why This Is NOT Acute Tonsillitis Alone - Acute tonsillitis presents with exudate and fever but **no uvula deviation** or **soft palate bulge** - This patient has **anatomical distortion** indicating a loculated collection ### Why This Is NOT Retropharyngeal Abscess - RPA presents with **posterior pharyngeal wall bulge** (not soft palate bulge) - RPA causes **neck stiffness** and **neck swelling** (absent here) - RPA is typically **more toxic** with risk of airway compromise from posterior displacement ### Why This Is NOT Epiglottitis - Epiglottitis presents with **"hot potato" voice** and **drooling** - **Dyspnea is more prominent** (stridor, respiratory distress) - **No intraoral bulge** visible; diagnosis requires laryngoscopy - Epiglottitis is a medical emergency with different management (airway first) ### Management Implications **Clinical Pearl:** The diagnosis of PTA is **clinical** — based on the classic triad of: 1. Uvula deviation 2. Soft palate bulge 3. Trismus + dysphagia Imaging (CT/ultrasound) is confirmatory but not required if clinical signs are clear. **Treatment:** Immediate drainage (needle aspiration or incision) + antibiotics (amoxicillin-clavulanate or cephalosporin) + supportive care. Delayed drainage risks airway compromise.