Carcinoid Tumor Arising within a Tailgut Cyst: A Case Report.

Lee, Chul Min; Lee, Seung Hyun; Jeon, Chang Wan; Ahn, Byung Kwon; Baek, Sung Uhn

doi:10.3393/jksc.2007.23.1.65

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Case Report
Carcinoid Tumor Arising within a Tailgut Cyst: A Case Report.: Lee, Chul Min , Lee, Seung Hyun , Jeon, Chang Wan , Ahn, Byung Kwon , Baek, Sung Uhn; Journal of the Korean Society of Coloproctology 2007;23(1):65-67
DOI: https://doi.org/10.3393/jksc.2007.23.1.65

Department of Surgery, Kosin University College of Medicine, Busan, Korea. gscrslsh@hanmail.net

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Abstract

Tailgut cysts are rare congenital lesions. They are believed to develop from remnants of the embryonic hindgut. Malignancy in tailgut cyst is extremely unusual. We experienced a case of a carcinoid tumor arising within a tailgut cyst at the presacral space. A 40-year-old woman was admitted for acute anal pain. Digital rectal examination revealed a 2-cm-sized submucosal tumor in the posterior midline rectum 4 cm above the anal verge. On sigmoidoscopic examination, the overlying rectal mucosa seemed to be intact. We performed a transanal incisional biopsy. The pathological diagnosis of the tumor biopsy revealed a malignant neuroendocrine tumor. The patient underwent an abdominoperineal resection. The tumor proved to be mutilocular cysts with a solid component. The cysts were diagnosed as tailgut cysts that were lined by a variety of epithelial types, including inner columnar cells, outer cuboidal cells, and transitional cells. The solid component in the cysts was confirmed as a carcinoid tumor on microscopic examination. Six months after the operation, she was found to have liver and brain metastases.

Keywords: Tailgut cyst;Carcinoid

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