Abstract
A 37-year-old man was brought into a hospital because of abdominal pain when abdominal CT scan and MRI showed a 6×6×5 cm tumor in the abdomen. Two months later he presented to our hospital on referral from the previous hospital. However, there was no tumor on CT image which was taken in our hospital. Further 1 year and 3 months later he was seen at our hospital because of severe abdominal pain with high fever. Abdominal CT scan showed a 6 × 6 × 6 cm intra-abdominal tumor again. Meckel's diverticulitis was likely and we performed surgery after medical treatment for 2 weeks. There was a tumor with the size of a fist of a child in the ileum. Partial resection of the small intestine was performed. The center of the tumor became necrotic with bleeding and communicated to the bowel lumen. This tumor was diagnosed as gastrointestinal stromal tumor (GIST) of the small intestine by pathological and immunohistochemical studies. We present the case which followed such a rare clinical course as the tumor once disappeared and then presented with diverticulitis like symptoms, together with a review of the literature.
