Japanese

Clinicopathological Features of Inverted Sessile Serrated Adenoma/Polyp of the Colon Keisuke Kawasaki 1,2 , Koichi Kurahara 2 , Yumi Oshiro 3 , Shunichi Yanai 1 , Makoto Eizuka 4 , Noriyuki Uesugi 4 , Kazuyuki Ishida 4 , Hiroyuki Kobayashi 5 , Shotaro Nakamura 1 , Tadahiko Fuchigami 2 , Tamotsu Sugai 4 , Takayuki Matsumoto 1 1Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Morioka, Japan 2Division of Gastroenterology, Matsuyama Red Cross Hospital, Matsuyama, Japan 3Department of Pathology, Matsuyama Red Cross Hospital, Matsuyama, Japan 4Department of Diagnostic Pathology, Iwate Medical University, Morioka, Japan 5Division of Gastroenterology, Fukuoka Sanno Hospital, Fukuoka, Japan Keyword: 大腸鋸歯状病変 , inverted growth , inverted SSA/P , inverted hyperplastic polyp , 大腸内視鏡 pp.1688-1695
Published Date 2015/12/25
DOI https://doi.org/10.11477/mf.1403200493
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 Objective : This investigation aimed to clarify the clinicopathological features of inverted SSA/P(sessile serrated adenoma/polyp)of the colon.

 Methods : We identified eight inverted SSA/Ps that were endoscopically resected at our institution, and their colonoscopic findings were retrospectively investigated.

 Results : The inverted SSA/Ps were predominantly right-sided and revealed a flat-elevated configuration with a central depression. Using Kudo's criteria, magnifying chromoendoscopy revealed type II pit patterns in all lesions and type II open-shape pit patterns in six lesions. Narrow band imaging revealed numerous varicose microvascular vessels or expanded crypt openings.

 Conclusions : Conventional and magnifying endoscopies appear to be invaluable for the diagnosis of inverted SSA/P.


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