A Meckel's diverticulum can be difficult to diagnose because it does not show up on standard tests for intestinal bleeding or blockages. Its symptoms can mimic those of other conditions, such as appendicitis or gallbladder disease. One of the best ways to confirm the presence of a Meckel's diverticulum is through a special nuclear medicine scan in which a small dose of radioactive dye is injected into the bloodstream. The dye collects in stomach tissue, so a diverticulum shows up on the scan if stomach tissue is present. X-rays usually show if the intestine is blocked. However, X-rays usually cannot identify Meckel's diverticulum as the cause.