A rare presentation of gastrointestinal stromal tumor arising from a meckel's diverticulum: A case report.

The most common congenital gastrointestinal tract abnormality is Meckel's diverticulum, affecting 1% to 2% of the population. Meckel's diverticulum can sometimes house a gastrointestinal stromal tumor (GIST), which is a rare malignant tumor. A 63-year-old man presented with occult melena. It turns out to be a GIST developing from Meckel's diverticulum after an exploratory laparotomy. Occult melena is one of the causes of unexplained and intractable anemia. Every family and general physician should keep in mind the possibility of occult blood loss via the gastrointestinal tract when treating the patient.