Metachronous Sporadic Desmoid Tumors Arisen in the Stomach and the Cecum.

Desmoid-type fibromatosis (DF) is a rare soft-tissue tumor demonstrating fibroblastic to myofibroblastic differentiation, recognized as a biologically intermediate, locally aggressive tumor; however, it can be clinically lethal due to its infiltrative growth and risk of locoregional recurrence. Desmoid-type fibromatoses can arise from any part of the body, however, intra-abdominal DFs comprise only 8% of all DFs. We report a case of a male in his 60s who presented with the metachronous occurrence of DF: gastric DF followed by cecal DF with two years of clinical interval. The latter tumor (cecal DF) developed under scheduled postoperative surveillance of laparoscopic gastrectomy. Although a surgical wound is known to be an inductive factor for DFs, the cecal DF developed in a part that was not a surgical site in the previous operation. Curative resection is the first treatment option when the tumor shows progression in size. Following the curative resection, close observation should be provided because of the risk of locoregional recurrence.