A 28-year-old woman presents with right lower quadrant pain for 48 hours, fever (38.8°C), and vomiting. On examination, she has severe tenderness in the RLQ with guarding and rigidity. WBC is 16,200/μL. Ultrasound shows an appendix measuring 10 mm with a hyperechoic focus suggesting perforation, and a loculated fluid collection (4 × 3 cm) adjacent to the appendix. What is the most appropriate management strategy?

Explanation

## Management of Perforated Appendicitis with Abscess Formation ### Clinical Presentation Interpretation **Key Point:** This patient has perforated acute appendicitis with a localized appendiceal abscess — a distinct clinical entity requiring a staged approach rather than immediate appendicectomy. ### Diagnostic Findings Indicating Perforation with Abscess | Finding | Significance | |---------|-------------| | Appendix >10 mm | Indicates inflammation/perforation | | Hyperechoic focus within appendix | Suggests perforation with gas/debris | | Loculated fluid collection (4 × 3 cm) | Organized abscess, not free peritonitis | | Guarding and rigidity | Peritoneal irritation, but localized | | Fever + elevated WBC | Systemic inflammatory response | ### Why Percutaneous Drainage + Interval Appendicectomy? **High-Yield:** The Hennigson protocol (percutaneous drainage + antibiotics + interval appendicectomy) is the standard of care for perforated appendicitis with abscess because: 1. **Immediate appendicectomy in this setting carries high morbidity:** - Friable, inflamed tissues increase risk of bowel injury - Increased bleeding and need for extensive dissection - Higher rates of anastomotic leak if bowel involved - Increased wound infection rates 2. **Percutaneous drainage allows:** - Source control (abscess evacuation) - Reduction of bacterial load - Resolution of acute inflammation over 6–8 weeks - Safer elective appendicectomy in interval period 3. **Interval appendicectomy (6–8 weeks later):** - Performed on non-inflamed, normal-appearing appendix - Significantly lower morbidity and mortality - Prevents recurrent appendicitis (10–15% risk if appendix left in situ) **Clinical Pearl:** The key differentiator is the **loculated abscess** — this indicates the body has walled off the infection. Immediate surgery risks entering inflamed, friable tissue planes. Percutaneous drainage + antibiotics allows the abscess to resolve and inflammation to settle before elective surgery. ### Mnemonic for Appendicitis Management Strategy **STAGE IT** — Sepsis localized? → Try percutaneous drainage + Antibiotics + Interval appendicectomy (6–8 weeks) → Elective removal when Inflammation resolves ### Contraindications to Percutaneous Drainage - Diffuse peritonitis (free fluid throughout abdomen) → immediate surgery - Hemodynamic instability despite resuscitation → immediate surgery - Uncontrolled sepsis → immediate surgery - Inability to access abscess safely → immediate surgery This patient has a **contained, localized abscess** — percutaneous drainage is appropriate.