Imaging of non-traumatic acute abdominal pain in adults presenting to the emergency department

A photography showing the A) erect and B) supine abdominal radiograph demonstrating a large bowel distension with large air-fluid level suggestive of distal large bowel obstruction in a 58-year-old male. No evidence of bowel perforation. Sigmoid cancer causing the obstruction was diagnosed by contrast enhanced CT. C) An enhanced coronal image of the abdomen and pelvis with oral contrast, demonstrating a thick and inflamed appendix (arrow) with soft tissue stranding suggestive of acute uncomplicated appendicitis. D) CT showed an acutely inflamed sigmoid diverticulum (arrow), with soft tissue stranding in a 35-year-old male with left lower abdominal pain. E) An unenhanced coronal low dose CT scan of the abdomen and pelvis, demonstrating 2 obstructive stones at the distal end of the left ureter (arrow) causing sever left hydronephrosis (star).