We report a case of gastrointestinal pacemaker cell tumor (GIPACT) with special reference to the usefulness of multiplaner reconstruction (MPR) and three-dimensional imaging (3D) by multislice computed tomography (MSCT) for selecting the surgical procedure and approach. A 36-year-old man with constipation was admitted for further examination was found in diagnostic imaging studies to have a submucosal tumor in the lower rectum. MPR and 3D were used to select the tumor approach and surgical procedure, resulting in a successful ultralow anterior resection with transanal anastmosis. Histological examination of the resected specimen showed the tumor consisted of spindle-shaped cells. Immunohistochemical testing was negative for s-100 and muscle-actin, and positive for CD34 and c-kit and the tumor was diagnosed as GIPACT. The postoperative course was uneventful except for temporary urinary dysfunction.
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