Synchronous occurrence of colorectal adenocarcinoma and colonic gastrointestinal stromal tumor.

The synchronous occurrence of GIST and other primary gastrointestinal malignancies has been rarely reported. We report the case of an 84 year-old female who presented with a rectal blood loss. Total coloscopy revealed a stenotic lesion at sigmoid colon covered by endoscopically healthy mucosa and also a massive polypoid cecal mass. The patient underwent left subtotal colectomy and ileorectal J-pouch anastomoses without diverting stoma. Histologically the sigmoid tumor met the GIST criteria and the cecal mass was a well differentiated adenocarcinoma. To our knowledge this synchronous occurrence is reported for first time in the literature.