A 28-year-old woman from Bangalore presents with a 5-day history of right lower quadrant pain, fever (38.5°C), and palpable mass in the RLQ. WBC is 14,200/μL. CT abdomen shows a 5.5 cm localized periappendiceal abscess with an inflamed appendix. She is haemodynamically stable with no signs of generalized peritonitis. What is the most appropriate management strategy?

Explanation

## Management of Appendicitis with Periappendiceal Abscess ### Clinical Scenario Analysis This patient presents with: - **Duration:** 5 days (chronic inflammation with localization) - **Findings:** Palpable RLQ mass, fever, elevated WBC - **Imaging:** CT-confirmed localized abscess (5.5 cm) with inflamed appendix - **Stability:** Haemodynamically stable, no generalized peritonitis **Key Point:** A localized periappendiceal abscess >4 cm in a stable patient is managed by **percutaneous drainage + antibiotics + interval appendicectomy**, NOT immediate surgery. ### Rationale for Conservative Management ```mermaid flowchart TD A[Appendicitis with periappendiceal abscess]:::outcome --> B{Abscess size?}:::decision B -->|< 4 cm| C[IV antibiotics + appendicectomy]:::action B -->|≥ 4 cm| D[Haemodynamically stable?]:::decision D -->|Yes| E[Percutaneous drainage + IV antibiotics]:::action D -->|No| F[Immediate surgery]:::urgent E --> G[Interval appendicectomy after 6-8 weeks]:::action C --> H[Appendicectomy within 24-48 hours]:::action ``` ### Why Percutaneous Drainage + Interval Appendicectomy? **High-Yield:** The **Richtter protocol** (percutaneous drainage + antibiotics + interval appendicectomy) is the gold standard for localized abscess >4 cm in stable patients. **Advantages:** 1. **Lower morbidity:** Avoids emergency surgery in inflamed, friable tissue 2. **Reduced complications:** Lower rates of bowel injury, anastomotic leak, and infection 3. **Better outcomes:** Interval appendicectomy (6–8 weeks later) allows inflammation to resolve 4. **Haemodynamic stability:** Allows time for optimization before elective surgery **Timing:** - Percutaneous drainage: Within 24 hours of diagnosis - Interval appendicectomy: 6–8 weeks after abscess resolution - Repeat imaging before interval surgery to confirm abscess resolution **Clinical Pearl:** The 6–8 week interval allows the inflammatory reaction to completely resolve, making the appendicectomy technically easier and safer. The recurrence rate of appendicitis during this interval is only 5–10%. ### Why NOT the Other Options? | Option | Why Wrong | |--------|----------| | Immediate open appendicectomy | Risks injury to bowel, mesentery, and adjacent structures in inflamed tissue; higher morbidity than percutaneous drainage + interval approach | | IV antibiotics alone | Abscess requires drainage; antibiotics alone have high failure rate (30–50%); risks rupture and peritonitis | | Laparoscopic appendicectomy | Laparoscopy is contraindicated in acute appendicitis with abscess due to risk of visceral injury and abscess rupture | **Mnemonic: ABSCESS Management — DRAIN & DELAY** - **D**rain the abscess percutaneously - **R**esolve inflammation with antibiotics - **A**void emergency surgery - **I**nterval appendicectomy after 6–8 weeks - **N**o immediate operative intervention ### Indications for Immediate Surgery Despite Abscess - Haemodynamic instability - Signs of generalized peritonitis - Failure of percutaneous drainage - Abscess rupture This patient meets NONE of these criteria, so percutaneous drainage is appropriate. [cite:Sabiston Textbook of Surgery 21e Ch 50; Harrison 21e Ch 297]