RESUMO
During a follow-upstudy after the treatment of T cell lymphoma, a 21-year-old man reported an intra-abdominal mass in his right lower abdomen, which was then confirmed using abdominal CT. Therefore, recurrence was suspected due to his medical history. To perform a biopsy, laparoscopic surgery was scheduled, which located the tumor in the mesentery of the terminal ileum, involving the cecum. For this, laparoscopic ileocecal resection was performed. After 7 days, the patient was discharged without complications. Histopathologically, the mass was diagnosed as a desmoid tumor via immunostaining. It is relatively rare that an intra-abdominal desmoid tumor occurs without risk factors in a young man. We herein report a case of an intra-abdominal desmoid tumor, which was successfully treated using laparoscopic surgery.