A moving Meckel's diverticulum on Tc-99m pertechnetate imaging in a patient with lower gastrointestinal bleeding.

Meckel's diverticulum is one of the most common causes of lower gastrointestinal hemorrhage in the young. We report a case of a 16-year-old youth who presented with a 3-day history of bright red bleeding per rectum. Clinical examination revealed pallor but nothing else of note. The patient had a hemoglobin of 9 G% on admission. Tc-99m pertechnetate scintigraphy was performed and demonstrated an abnormal focus in the pelvis on the right that changed in position during the course of imaging. A laparotomy was done and a 5 x 2-cm Meckel's diverticulum was removed from the ileum. Histopathologic examination revealed heterotopic gastric mucosa of the body type. The patient recovered fully after operation.