A 35-year-old man from Mumbai with a 4-year history of Crohn disease (previously managed with 5-ASA) now presents with a 2-week history of severe cramping abdominal pain, fever (38.5°C), and palpable right lower quadrant mass. CT abdomen shows a 6 cm × 5 cm collection in the right ileal mesentery with adjacent bowel wall thickening and stricture formation. Serum albumin is 2.8 g/dL. Which of the following is the most appropriate next step in management?

Explanation

## Management of Crohn Disease with Intra-Abdominal Abscess ### Clinical Scenario Analysis **Key Point:** This patient has a **contained intra-abdominal abscess** (6 cm collection with defined borders on CT) complicating Crohn disease. The presence of fever, systemic signs, and hypoalbuminemia indicates active inflammation and sepsis. ### Management Algorithm for IBD-Associated Abscess ```mermaid flowchart TD A[Crohn disease with fever and imaging-confirmed abscess]:::outcome --> B{Abscess characteristics?}:::decision B -->|Large, contained, accessible| C[Percutaneous drainage]:::action B -->|Diffuse, uncontained, multiple| D[Immediate surgery]:::urgent C --> E[IV antibiotics + supportive care]:::action E --> F[Assess response at 48-72 hrs]:::decision F -->|Improved| G[Continue medical therapy, plan elective resection]:::action F -->|Deteriorating| H[Urgent surgical intervention]:::urgent D --> I[Resection + diversion if needed]:::action ``` ### Why Percutaneous Drainage Is Preferred **High-Yield:** The **percutaneous drainage approach** has become the standard of care for accessible, loculated intra-abdominal abscesses in IBD because it: 1. **Avoids emergency surgery** — which carries higher morbidity and mortality in Crohn disease 2. **Allows time for optimization** — nutritional repletion, immunosuppression, and resolution of inflammation 3. **Preserves bowel** — reduces the need for extensive resection 4. **Enables elective surgery later** — when the patient is in better condition 5. **Success rate >80%** — for abscesses >3 cm with percutaneous drainage ### Rationale Against Other Options | Option | Why It's Wrong | |--------|----------------| | **Immediate laparotomy** | Reserved for diffuse peritonitis, uncontained abscesses, or failure of percutaneous drainage. Emergency surgery in Crohn disease has higher morbidity. | | **Steroids + antibiotics alone** | Inadequate for a large, loculated collection. Antibiotics alone will not drain purulent material. Steroids may worsen sepsis. | | **Endoscopic drainage** | Not feasible for mesenteric abscesses. Endoscopy accesses the lumen, not extraintestinal collections. | ### Adjunctive Management **Clinical Pearl:** After percutaneous drainage: - Start **broad-spectrum IV antibiotics** (covering gram-negatives and anaerobes) - Provide **nutritional support** (albumin 2.8 is severely depleted) - Continue **medical therapy** (biologics, immunosuppressants) once infection controlled - Plan **elective resection** of the strictured segment 6–12 weeks later if clinically indicated ### Mnemonic: DRAIN Before RESECT **DRAIN** = Drainage, Rest bowel, Antibiotics, Immunosuppression, Nutrition Then **RESECT** = only if stricture/fistula persists after medical optimization [cite:Harrison 21e Ch 297]