A 19-year-old man presents with a 2-day history of abdominal pain. The pain started in the central abdomen and has now become constant and has shifted to the right iliac fossa. The patient has vomited twice today and is off his food. His motions were loose today, but there was no associated rectal bleeding. Examination The patient has a temperature of 37.8°C and a pulse rate of 110/min.

On examination of his abdomen he has localized tenderness and guarding in the right iliac fossa. Urinalysis is clear. Haemoglobin 14.2 g/dL Mean cell volume 86 fL White cell count 19 x 10 9 /L Platelets 250 x 10 9 /L Sodium 136 mmol/L 1 Potassium 3.5 mmol/L Urea 5.0 mmol/L Creatinine 62 µmol/L C-reactive protein 20 mg/L What is the probable diagnosis? Click here for the answer *This patient case is from Docplexus Editorial Team for educative purpose only. Source: 100 Cases of Surgery