Laparoscopic resection of extra-gastrointestinal stromal tumor of the transverse mesocolon

Abstract

The patient was a 58-year-old man. A recent complete work-up was done to find the cause of epigastric pain and revealed a nodule about 4 cm in diameter in the upper right abdomen on CT scans. Laparoscopic resection was performed to allow for a definitive diagnosis to be made and to treat the lesion. The tumor was located in the transverse mesocolon, and there was no communication between the lesion and the ascending or transverse colon. Spindle-shaped tumor cells were arranged in palisades. The number of mitotic figures was only 1/50 HPF. The tumor was weakly positive for KIT and negative for CD34. From these findings, a diagnosis of extra-gastrointestinal stromal tumor originating in the transverse mesocolon was made.