Abstract:

A 46-year-old male patient with an abdominal pain complaint and a palpable abdominal mass applied to our general surgery outpatient clinic. The computed tomography revealed a well-circumscribed solid mass, approximately 12 cm in diameter, which is thought to be a gastrointestinal stromal tumor originating from the cecum. The colonoscopy detected an external pressure on the cecum. No remarkable feature was noted in the patient’s history. Right hemicolectomy was performed. Pathological examination revealed a collagen-rich hypocellular mesenchymal tumor originating from the appendiceal wall, which was negatively stained with CD117 and DOG-1 immunohistochemical antibodies. The histopathological diagnosis revealed a fibromatous lesion (desmoid tumor). The patient was discharged on postoperative day 6 and was transferred to the oncology service.

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