Colon schwannoma: A case report

Schwannoma is a common soft tissue tumor, arises form Schwann cell, which cover the peripheral nerves. Gastrointestinal schwannomas are rare and colon schwannomas are extremely rare. We report a case of ascending colon schwannoma with the initial presentation of chronic diarrhea. This 65 year-old men had chronic water diarrhea for six months. Colonoscopy exam ination showed a submucosal tumor with ulceration and it protruded into ascending colon. The initial biopsy pathology showed necrotizing inflammation. Another two colonoscopic biopsy also failed to prove the nature of the submucosal tumor. Finally, he received right hemicolectomy with the tumor completely resected. The pathological diagnosis of this tumor was benign gastrointestinal schwannoma.