Technetium-99m Pertechnetate Scan with a<unk> . A technetium-99m (99mTc) pertechnetate scan, also called<unk>  scan or nuclear scintigraphy scan, is the investigation of choice to diagnose<unk> 's diverticula in children. This scan detects gastric mucosa; since approximately 50% of symptomatic<unk> 's diverticula have ectopic gastric or pancreatic cells contained within them, this is displayed as a spot on the scan distant from the stomach itself. In children, this scan is highly accurate and noninvasive, with 95% specificity and 85% sensitivity; however, in adults the test is only 9% specific and 62% sensitive. Patients with these misplaced gastric cells may experience peptic ulcers as a consequence. Therefore, other tests such as colonoscopy and screenings for bleeding disorders should be performed, and angiography can assist in determining the location and severity of bleeding. Colonoscopy might be helpful to rule out other sources of bleeding but it is not used as an identification tool. Angiography of a<unk>  that presented with bleeding. Angiography might identify brisk bleeding in patients with<unk> . Ultrasonography could demonstrate omphaloenteric duct remnants or cysts. Computed tomography (CT scan) might be a useful tool to demonstrate a blind ended and inflamed structure in the mid-abdominal cavity, which is not an appendix. In asymptomatic patients,<unk>  is often diagnosed as an incidental finding during laparoscopy or laparotomy.
Meckel's diverticulum
Hartnup disease
Intussusception 
Mirizzi's syndrome
Hirschsprung's disease
Vesicointestinal fistula
Cord colitis syndrome
Tropical sprue