A 28-year-old woman presents to the emergency department with a 16-hour history of periumbilical pain that migrated to the right lower quadrant. On examination, she has a positive Rovsing sign and McBurney's point tenderness. Her temperature is 38.2°C, HR 92/min, and WBC 12,500/μL. Urine pregnancy test is negative. Abdominal ultrasound shows a non-compressible appendix measuring 8 mm with surrounding free fluid. What is the most appropriate next step in management?

Explanation

## Clinical Assessment **Key Point:** In a patient with classic clinical features of acute appendicitis AND a confirmatory ultrasound (non-compressible appendix ≥6 mm with periappendiceal free fluid), the most appropriate next step is **diagnostic laparoscopy**, which simultaneously confirms the diagnosis and allows definitive surgical treatment (laparoscopic appendicectomy) in a single procedure. ## Why Diagnostic Laparoscopy Is the Best Next Step ### Alvarado / Clinical Scoring Context This patient has: - Migratory RLQ pain ✓ - McBurney's point tenderness ✓ - Positive Rovsing sign ✓ - Fever 38.2°C ✓ - Leukocytosis 12,500/μL ✓ - Ultrasound: non-compressible appendix 8 mm + free fluid ✓ An Alvarado score ≥7 with a **positive ultrasound** constitutes a **definitive diagnosis** of acute appendicitis in most guidelines (Bailey & Love, Schwartz's Principles of Surgery). Further imaging is not required. ### Imaging Hierarchy in This Context | Modality | Role | |----------|------| | **Ultrasound (done)** | First-line; already positive — appendix 8 mm, non-compressible, free fluid | | **CT abdomen/pelvis** | Reserved for **equivocal** ultrasound or atypical presentation; adds radiation without changing management here | | **Diagnostic laparoscopy** | Indicated when diagnosis is confirmed or highly probable; therapeutic in the same sitting | ### Why CT Is NOT the Best Next Step Here - The ultrasound is **diagnostic**, not equivocal. A non-compressible appendix ≥6 mm with periappendiceal fluid is the sonographic hallmark of appendicitis (sensitivity 85–90%, specificity 95–98%). - Adding CT when the diagnosis is already established delays definitive treatment, exposes the patient to ionizing radiation, and increases cost without altering the surgical decision. - Current NICE guidelines (2021) and Schwartz's Principles of Surgery state: when clinical + ultrasound findings are conclusive, proceed to surgery without mandatory CT. ### Why Not Open Appendicectomy (Option A)? - Laparoscopic appendicectomy is the **preferred approach** in women of reproductive age (allows concurrent evaluation of pelvic organs, lower wound infection rate, faster recovery — Bailey & Love, 27th ed.). - "Immediate open appendicectomy" is outdated as the default approach. ### Why Not Observation (Option C)? - Non-operative management with antibiotics is an option only in **uncomplicated appendicitis** in selected patients who refuse surgery or have high operative risk. This patient has no contraindications to surgery and has free fluid suggesting early peritoneal involvement. **High-Yield:** When ultrasound confirms appendicitis (non-compressible appendix ≥6 mm + periappendiceal changes) in a patient with classic clinical features, proceed directly to diagnostic laparoscopy ± appendicectomy. CT is reserved for **equivocal** cases. **Clinical Pearl:** In women of reproductive age, diagnostic laparoscopy has the added advantage of evaluating for gynecological pathology (ovarian torsion, ectopic pregnancy, PID) that may mimic appendicitis — making it superior to CT in this demographic when the diagnosis is already strongly supported. *Reference: Schwartz's Principles of Surgery, 11th ed.; Bailey & Love's Short Practice of Surgery, 27th ed.; NICE Guideline NG61 (2021)*