A 28-year-old woman from Bangalore presents with right lower abdominal pain for 4 days, fever (38.8°C), and a palpable mass in the right iliac fossa. Laboratory findings show WBC 15,400/μL with left shift and CRP 12 mg/dL. Ultrasound reveals a 4 cm complex mass with internal echoes and surrounding free fluid in the right iliac region. The appendix itself is not clearly visualized. She is hemodynamically stable. What is the most appropriate management?

Explanation

## Clinical Diagnosis: Perforated Appendicitis with Abscess **Key Point:** This patient has a **perforated appendicitis with abscess formation** (phlegmon/localized collection). The clinical clues are: - Prolonged symptoms (4 days) — allows time for abscess formation - Palpable mass in RLQ — indicates localized inflammatory mass - Complex ultrasound image with internal echoes and free fluid — abscess features - Appendix not clearly visualized — obscured by surrounding inflammation - Hemodynamically stable — no signs of generalized peritonitis or septic shock ## Management Principle: Three-Stage Approach **High-Yield:** The gold standard for **perforated appendicitis with abscess in a stable patient** is: ```mermaid flowchart TD A[Perforated appendicitis with abscess]:::outcome --> B{Hemodynamically stable?}:::decision B -->|Yes| C[Stage 1: Percutaneous drainage]:::action C --> D[Stage 2: IV antibiotics 6-8 weeks]:::action D --> E[Stage 3: Interval appendicectomy]:::action E --> F[Definitive cure]:::outcome B -->|No| G[Emergency surgery]:::urgent ``` ## Why Percutaneous Drainage? **Clinical Pearl:** Percutaneous drainage (under ultrasound or CT guidance) is preferred over immediate surgery because: 1. **Lower morbidity:** Avoids difficult dissection through inflamed, friable tissues 2. **Reduced complications:** Decreases risk of bowel injury, fecal fistula, and anastomotic leak 3. **Better outcomes:** Allows inflammation to resolve before elective interval appendicectomy 4. **Sepsis control:** Rapid source control without operative trauma in a localized abscess Interval appendicectomy (6–8 weeks later) is performed after resolution of inflammation to prevent recurrence (10–30% without appendicectomy). ## Comparison of Management Options | Scenario | Management | |----------|------------| | **Uncomplicated acute appendicitis** | Immediate appendicectomy | | **Perforated appendicitis with abscess, stable** | Percutaneous drainage + antibiotics → interval appendicectomy | | **Perforated appendicitis with abscess, unstable/septic** | Emergency surgery (drainage + appendicectomy or damage control) | | **Generalized peritonitis** | Emergency laparotomy | **Warning:** Immediate open appendicectomy in a stable patient with abscess increases morbidity due to dense adhesions and inflamed tissues. This is reserved for unstable patients or those with generalized peritonitis. **Mnemonic:** **PADI** — **P**ercutaneous drainage, **A**ntibiotics, **D**elay, **I**nterval appendicectomy (for stable perforated appendicitis with abscess). [cite:Sabiston Textbook of Surgery 21e Ch 50; Harrison 21e Ch 297]