OBJECTIVE: Report of one case of desmoid tumor in a patient who had been treated of a testicular semi-noma 26 months before, with excision of a retroperitoneal mass and chemotherapy. On follow-up he presented with a mesenteric abdominal mass which was clinically labeleled as a recurrence of the seminoma.RESULTS: Histologically it was reported as a mesenteric desmoid tumor. Differential diagnosis with gastrointestinal stromal tumor was performed with immunohistochemical stu-dies.CONCLUSIONS: Desmoid tumor is rare. There are few cases reported in patients with history of previous testicular tumor. It should be included in the differential diagnosis of testicular tumor recurrences.