title: Endoscopic features of sessile serrated adenoma and other serrated colorectal polyps.
abstract: OBJECTIVE
  Sessile serrated adenoma is a subtype of serrated colorectal polyps that can potentially give rise to colorectal carcinoma. We aimed to characterize the endoscopic features of sessile serrated adenoma as compared to those of other subtypes of serrated colorectal polyps.
  
  
  METHODS
  A total of 202 serrated colorectal polyps were retrospectively collected and pathologically subclassified as sessile serrated adenoma, hyperplastic polyp, or traditional serrated adenoma. The patients' demographics and endoscopic findings were reviewed, and comparisons were made between groups.
  
  
  RESULTS
  We found 57 sessile serrated adenomas, 104 hyperplastic polyps, and 41 traditional serrated adenomas. Sessile serrated adenomas were larger in size, and they had more granular or nodular surface and more irregular or vague margin than hyperplastic polyps; however, these two subgroups were similar in terms of their sessile configuration and white coloring. Sessile serrated adenomas could be distinguished from traditional serrated adenomas based on the pedunculated configuration and red coloring unique to the traditional serrated adenomas. Nine sessile serrated adenomas were of note due to coverage with abundant mucus, which was rarely seen in other subgroups.
  
  
  CONCLUSIONS
  We characterize the endoscopic features of sessile serrated adenoma as compared to those of hyperplastic polyp and traditional serrated adenoma.
authors.affiliation: Department of Gastroenterology and Hepatology, Kyoto University Hospital, Kyoto, Japan. yatsushi@kuhp.kyoto-u.ac.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yamada
authors.forename: Kenji
authors.initials: K
authors.lastname: Notohara
authors.forename: Ikuo
authors.initials: I
authors.lastname: Aoyama
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Miyoshi
authors.forename: Shinichi
authors.initials: S
authors.lastname: Miyamoto
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Fujii
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamamoto
mesh_terms: D000236:Adenoma / Q000473:pathology*; D000368:Aged; D003111:Colonic Polyps / Q000473:pathology*; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013194:Staining and Labeling