Observation of the drainage process of the residual lipoma after endoscopic unroofing technique during colonoscopic evaluation of post-procedural hematochezia.

A 57-year-old man was referred to our hospital for further management of a subepithelial lesion noted on colonoscopy. He underwent endoscopic treatment of unroofing technique, in which the protruding portion of the tumor was partially resected. Due to a small amount of hematochezia, colonoscopy was performed to re-evaluate the lesion post-treatment. This enabled the observation of the drainage process of the residual lipoma. Remission was achieved and confirmed 8 months after the treatment. Endoscopic unroofing technique has been reported as a safe and effective method of treating lipomas, particularly large ones. To the best of our knowledge, this is the first endoscopic unroofing case in which the drainage process of the residual lipoma was observed and the remission of the lesion was confirmed.