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Endoscopic Submucosal Dissection for Rectal Tumors Advancing to the Anal Canal Yoshiro Tamegai 1 , Akiko Chino 1 , Teruhito Kishihara 1 , Sho Suzuki 1 , Chika Taniguchi 1 , Kenjiro Morishige 1 , Naoyuki Uragami 1 , Takashi Akiyoshi 2 , Tsuyoshi Konishi 2 , Yoshiya Fujimoto 2 , Satoshi Nagayama 2 , Yosuke Fukunaga 2 , Masashi Ueno 2 , Masahiro Igarashi 1 1Endoscopy Division, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo 2Department of Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo Keyword: ESD , 大腸ESD , 早期大腸癌 , 歯状線 , TAR pp.173-183
Published Date 2013/2/25
DOI https://doi.org/10.11477/mf.1403113722
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 Patients suffering from colorectal cancers have markedly increased by 2.5 times among recent 20 years in Japan. The progress of the endoscopic resection techniques such as ESD(endoscopic submucosal dissection)has led to changes in therapeutic strategies for early colorectal cancers. Also the ESD technique is a very useful endoscopic procedure, making it possible to perform en bloc resection of rectal tumors advancing to the anal canal. ESD was performed for 442 cases of colorectal neoplasms in 430 patients(male : female=260 : 170 ; mean age, 66.8 years). Among these cases, 12 cases were located in the rectum to the anal canal close to the dentate line. The average size of the tumors was 46.4mm in diameter.

 Indication for ESD for rectal neoplasms advancing to the anal canal was thought to be the same as the criteria proposed by The Colorectal ESD Standardization Implementation Working Group. The indications were as follows, (1)Lesions that were larger than 20 mm in diameter in which en bloc resection using snare EMR is difficult, (2)Mucosal lesions with fibrosis caused by prolapse due to biopsy or peristalsis of the lesions, (3)Sporadic localized tumors with chronic inflammation such as ulcerative colitis, (4)Local residual early cancer after endoscopic resection. It should be added that en bloc resection using the ESD procedure for circumferential-type tumors is considered to be a conditional indication due to the risk of anal stenosis.

 On the other hand, the incidence of local recurrence with TAR was reported to be high(12 to 30%). However, local recurrence and severe complications related to ESD were not observed in our series. Because of above mentioned reasons, ESD seems to play an important role in the therapeutic strategy for treating rectal tumors advancing to the anal canal.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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