Abstract
We report treating a solitary fibrous tumor originated in the transverse colon mesentery by laparoscopically. A 72-year-old man admitted for an abdominal mass was found in enhanced computed tomography (CT) to have a 6 cm solid mass adjacent to the transverse colon. An artery branching from the middle colic artery fed a tumor. T1-weighted magnetic resonance imaging (MRI) showed a homogeneous low-intensity mass. Laparoscopic surgery conducted for a suspected mesenchymal tumor arising from the transverse colon found that the tumor had originated in the transverse colon mesentery. We resected the tumor laparoscopically. Histologically, the tumor consisted of spindle cells presenting a "patternless pattern." The labeling index was 6.8%. Immunohistochemical staining was positive for CD34 and bcl-2 and negative for c-kit, α-SMA, vimentin, and desmin. The tumor was definitively diagnosed as a benign solitary fibrous tumor of the transverse colon mesentery.
