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Authors: Huang K-C and Liang J-T
This 52-year-old woman presented with symptoms of rectal bleeding and constipation. The initial diagnosis was submucosal tumour, presumed colonic lipoma, after colonoscopy (a) and computed tomography (b); arrow shows tumour. She underwent laparoscopic left hemicolectomy with removal of the tumour (c); histology showed a schwannoma. Preoperative colonoscopy with biopsy is often non-diagnostic for submucosal tumours. Schwannoma is a rare possibility when a submucosal tumour is encountered.