A 28-year-old woman presents with a 36-hour history of right lower quadrant pain, fever (38.5°C), and vomiting. On examination, she has severe tenderness and guarding in the right iliac fossa with absent bowel sounds. Her WBC is 14,200/μL. Abdominal X-ray shows a small amount of free air under the diaphragm. CT abdomen confirms a perforated appendix with a 4 cm localized abscess. What is the most appropriate management?

Explanation

## Perforated Appendicitis with Free Air and Localized Abscess: Management Strategy **Key Point:** When perforated appendicitis presents with **free air under the diaphragm**, **absent bowel sounds**, and **severe guarding**, this indicates a surgical emergency requiring immediate operative intervention — not percutaneous drainage alone [Sabiston Textbook of Surgery, 20th ed., Ch. 50; Bailey & Love's Short Practice of Surgery, 27th ed.]. ## Clinical Context | Finding | Implication | |---------|-------------| | Free air under diaphragm | Confirmed perforation with pneumoperitoneum | | Absent bowel sounds + severe guarding | Peritoneal contamination / generalized peritonitis | | 4 cm localized abscess on CT | Contained component, but overall picture is surgical emergency | | 36-hour duration, fever 38.5°C, WBC 14,200 | Active sepsis requiring source control | **High-Yield:** The combination of **free air + absent bowel sounds + severe guarding** places this patient in **Hinchey III–IV** territory (generalized peritonitis / fecal peritonitis), NOT Hinchey I–II. Percutaneous drainage is appropriate only for Hinchey I–II (localized phlegmon/abscess WITHOUT generalized peritonitis or free air). ## Why Immediate Open Appendicectomy with Drainage? 1. **Free air = pneumoperitoneum** → indicates ongoing or recent perforation with peritoneal soiling; this mandates emergency surgery for source control. 2. **Absent bowel sounds + severe guarding** → signs of generalized peritoneal irritation; delaying surgery risks worsening sepsis and multi-organ failure. 3. **Open approach preferred over laparoscopic** in this setting: the 4 cm abscess, hostile abdomen, and generalized contamination make open surgery safer for thorough washout and drainage. 4. **Percutaneous drainage (Option D)** is contraindicated when there is free air and signs of generalized peritonitis — it does not address the ongoing peritoneal contamination. ## Why Not the Other Options? - **Option A (Laparoscopic appendicectomy):** Laparoscopy is relatively contraindicated in frank generalized peritonitis with free air and absent bowel sounds; open surgery allows better washout. - **Option C (Antibiotics + observation):** Absolutely contraindicated with free air and peritonitis — this is a surgical emergency. - **Option D (Percutaneous drainage + interval appendicectomy):** Appropriate for Hinchey I–II (localized abscess, no free air, no generalized peritonitis). This patient's free air and absent bowel sounds exclude this conservative approach. **Clinical Pearl:** The Hinchey classification guides management: - **Hinchey I–II** (pericolic/pelvic abscess, no free air, no generalized peritonitis): Percutaneous drainage + interval appendicectomy - **Hinchey III–IV** (generalized peritonitis, free air, fecal contamination): **Immediate open surgery with washout and drainage** **Mnemonic: FREE AIR = OPERATE** — Free air under diaphragm in the context of appendicitis with peritonitis mandates emergency open appendicectomy with drainage, not conservative management.