PMC7396905_01
Colonoscopy finding. Colonoscopy showed 20-mm of sub-mucosal tumor at low rectum (Fig. 1a). The tumor was elastic hard and move easily. An endoscopic ultrasonography revealed low echoic mass (Fig. 1b). Biopsy revealed no specific findings.
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Colonoscopy showed 20-mm of sub-mucosal tumor at low rectum (Fig. 1a). An endoscopic ultrasonography revealed low echoic mass (Fig. 1b).
Pelvic CT finding. Pelvic CT showed that a 20-mm low density mass at posterior of lower rectum.
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Abdominal computed tomography showed that a 20-mm low density mass at posterior of lower rectum (Fig. 2).
Intra-operative finding for ta-TME. we introduced GelPOINTR Path Trans anal Access Platform (Applied Medical, Inc. Rancho Santa Margerita, CA, USA) to anal canal. A standard 10 mm-camera and conventional laparoscopic instrument were used.
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A standard 10 mm-camera and conventional laparoscopic instrument were used (Fig. 3).
Macroscopic and histological appearance.. a) Macroscopic finding of resected rectum, b) the cyst was fulfilled by mucinous content. c) Histologically, the cyst was composed of single epithelial layer and smooth muscle layer. In high magnification, epithelial layer was ectopic ciliated epithelium.
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Macroscopically, rectum had a submucosal mass sized 15 mm in diameter (Fig. 4a) that showed cystic change fulfilled mucinous content in cutting surface (Fig. 4b). Finally, rectal duplication cyst was diagnosed (Fig. 4c).