A 22-year-old male presents to the emergency department with a 36-hour history of periumbilical pain that migrated to the right lower quadrant. He reports anorexia, nausea, and one episode of vomiting. On examination, he is febrile (38.5°C), and tenderness is elicited at McBurney's point with positive Rovsing's sign and rebound tenderness. His WBC is 13,500/μL with left shift. Ultrasound shows a non-compressible appendix measuring 8 mm with surrounding free fluid. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis and Management Rationale ### Clinical Presentation Analysis **Key Point:** This patient has a classic presentation of acute appendicitis with the pathognomonic migration of pain from periumbilical region to right iliac fossa (McBurney's point). The clinical triad present: 1. Migratory pain (periumbilical → RLQ) 2. Anorexia preceding vomiting 3. Right lower quadrant tenderness with positive Rovsing's sign ### Diagnostic Findings | Finding | Significance | |---------|-------------| | Fever (38.5°C) | Indicates inflammatory response | | WBC 13,500 with left shift | Confirms acute bacterial infection | | Ultrasound: non-compressible appendix >6 mm | Diagnostic for acute appendicitis | | Surrounding free fluid | Suggests localized peritonitis | | Rebound tenderness | Peritoneal irritation present | **High-Yield:** In a patient with clinical diagnosis of acute appendicitis confirmed by imaging, delaying surgery increases risk of perforation, abscess formation, and peritonitis. ### Why Immediate Surgery? **Clinical Pearl:** The combination of: - Classic clinical presentation (migratory pain + RLQ tenderness) - Positive physical examination signs (Rovsing's, rebound) - Confirmatory imaging (ultrasound with non-compressible appendix) - Systemic signs of infection (fever, leukocytosis with left shift) ...constitutes a surgical emergency. Appendicectomy is the definitive treatment and should not be delayed. **Warning:** Conservative management with antibiotics alone is associated with recurrence rates of 20-40% and is reserved for: - Appendiceal mass/abscess (managed initially with percutaneous drainage + antibiotics) - Perforated appendicitis with diffuse peritonitis (resuscitation first, then surgery) - Patient refusal of surgery This patient has uncomplicated acute appendicitis — surgery is indicated. ### Mnemonic for Appendicitis Diagnosis **APPENDIX** — Anorexia, Pain migration, Periumbilical to iliac, Pyrexia, Elevated WBC, Nausea, Diarrhea/Constipation, Imaging confirms, eXamination (McBurney's point tenderness)