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Histopathological Characteristics and Diagnostic Criteria of SSA/P, from Project Research “Potential of Cancerization of Colorectal Serrated Lesions” of the Japanese Society for Cancer of the Colon and Rectum Takashi Yao 1 , Tamotsu Sugai 2 , Akinori Iwashita 3 , Takahiro Fujimori 4 , Ryoji Kushima 5 , Mitsuhiro Nokubi 6 , Hiroyuki Mitomi 1 , Yoichi Ajioka 7 , Fumio Konishi 8 1Department of Human Pathology, Juntendo University School of Medicine, Tokyo 2Division of Molecular Diagnostic Pathology, Department of Pathology, School of Medicine, Iwate Medical University, Morioka, Japan 3Department of Pathology, Fukuoka University Chikushi Hospital, Chikushino, Japan 4Department of Molecular and Surgical Pathology, Dokkyo Medical University School of Medicine, Tochigi, Japan 5Clinical Laboratory Division, National Cancer Center Hospital, Tokyo 6Division of Pathology, Saitama Medical Center, Jichi Medical University, Saitama, Japan 7Division of Molecular and Diagnostic Pathology, Niigata University, Graduate School of Medical and Dental Sciences, Niigata, Japan 8Department of Surgery, Saitama Medical Center, Jichi Medical University, Saitama, Japan Keyword: sessile serrated adenoma/polyp , hyperplastic polyp , compartmentalization pp.442-448
Published Date 2011/4/25
DOI https://doi.org/10.11477/mf.1403102182

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 Colorectal serrated lesions are basically classified into HP(hyperplastic polyp),TSA(traditional serrated adenoma), and SSA/P(sessile serrated adenoma/polyp)in the latest WHO classification, but there are many problems which are yet unsolved concerning the significance of the carcinogenetic pathway including the risk of cancerization. Because there has been variation amongst observers in the diagnosis of SSA/P and because the diagnostic criteria of SSA/P have not yet been established, the establishment of diagnostic criteria is essential for analyzing the potential of the cancerization.

 In project research “potential of cancerization of colorectal serrated lesion” of the Japanese Society for Cancer of the Colon and Rectum, the diagnostic criteria of SSA/P have been newly established recently. The essential histological alteration of SSA/P has been clarified as an aberration of crypt compartmentalization, which has prompted various kinds of reported histological features. Therefore, the most important findings based on this alteration are considered to be as follows : 1)crypt dilation, 2)irregularly branching crypts, 3)horizontally arranged basal area crypts at the basal(inverted T-and/or L-shaped crypts). If the serrated lesion have more than 2 of these findings, it can be diagnosed as SSA/P.

 From now on, we will classify the serrated lesion based on these criteria, analyze clinicopathological characteristics and risk of cancerization of SSA/P, and establish its clinical management.


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