2017 Volume 37 Issue 3 Pages 437-441
An 80-year-old man visited our hospital complaining of right lower quadrant abdominal pain and abdominal fullness. An abdominal CT examination showed a lobulated tumor 14 cm in diameter in the pelvic cavity. Endoscopy and irrigoscopy showed a compression phenomenon toward the sigmoid colon by the tumor. We diagnosed the patient as having subileus and performed an emergency operation. A pelvic tumor connected with the sigmoid colon and infiltrating the mesentery was found, so a partial resection of the sigmoid colon and small intestine was performed. Peritoneal disseminations were observed in the abdominal cavity and were removed. A pathological examination showed c-kit positivity, and high-risk gastrointestinal stromal tumor (GIST). GIST derived from the large intestine accounts for 5% of all GISTs. Thus, GIST derived from the colon is relatively rare. We report a case of GIST derived from the sigmoid colon that presented as subileus and describe the characteristics of GISTs derived from the colon.
