30/12/2025
Diagnosis of Acute Appendicitis
Acute appendicitis is primarily a clinical diagnosis supported by laboratory and imaging findings. The aim is to identify the disease early while minimizing unnecessary negative appendicectomies.
History:
Pain characteristics: Typically starts as vague, peri-umbilical pain migrating to the right iliac fossa (RIF) due to visceral → parietal peritoneal irritation (The initial pain is visceral in origin, referred via T10 (same dermatome as the umbilicus).
As inflammation spreads and irritates the parietal peritoneum overlying the appendix, the pain localizes to the RIF.
Associated symptoms: Nausea, vomiting, anorexia, low-grade fever.
Differential pointers:
Upper respiratory or urinary symptoms may suggest alternative pathology.
Detailed gynaecological history and pregnancy test essential in women of child-bearing age — pregnancy must be excluded first.
Ask about bowel changes and family history of inflammatory bowel disease.
Clinical Scoring:
Alvarado score (Migration, , Nausea, Tenderness, Rebound, Elevated temperature, Leukocytosis, Shift to left) may guide decisions but is not diagnostic.
Primarily used to support admission vs discharge decisions in borderline cases.
Examination:
Typical findings:
RIF tenderness
Rebound tenderness
Rovsing’s sign: RIF pain when pressing LIF
Psoas sign: Pain on right hip extension suggests retrocecal appendix
Obturator sign: Pain on internal rotation of flexed right hip (pelvic appendix)
Cough test: Localizes peritoneal irritation
These signs support, but none are individually diagnostic.
Investigations
Bloods: Neutrophilia and elevated CRP support inflammation, but normal values do not exclude appendicitis.
Urine dipstick: Exclude UTI; pregnancy test mandatory in women of reproductive age.
Imaging
Ultrasound:
First-line in females to rule out tubo-ovarian pathology.
Limited utility in males except in equivocal cases.
CT scan:
Highly accurate but use selectively.
Use caution in young patients (radiation).
Low threshold in patients >40 years to exclude malignancy or identify alternate causes.
Clinical judgment remains central. Scores, labs, and scans support but never replace bedside assessment.
Based on ultrasound reports a tubular blind dilated structure seen in the RIF with mild fluid around denoting likely appendicitis, the patient is been booked and consented for laparoscopic appendicectomy, a 36 years old male, 2/7 history of RIF pain, examined the patient very mildly tender RIF no rebound, not clinically convinced, CRP 20, WCC 11.9, normal Urine Dip
To resolve this, patient has been offered watchful waiting till tomorrow with re-examine and re-blood tests, vs CT AP, they opted CT Abdo pelvis which luckily showed no acute appendicitis, and patient went home.