title: Endoscopic characteristics of colorectal serrated lesions.
abstract: OBJECTIVE
  With the recent changes of pathological concepts, colorectal serrated lesions can be now divided into traditional serrated adenoma, typical hyperplastic polyp and sessile serrated polyp. The aim of this study is to clarify the endoscopic differences among these three groups.
  
  
  METHODS
  A total number of 362 serrated lesions larger than 5mm were evaluated. These were detected with ordinary view and observed also with magnifying chromoendoscopic view. The final pathologic diagnosis of the resected specimens was made blinded.
  
  
  RESULTS
  There were significant differences between traditional serrated adenoma and sessile serrated polypconcerning location, configuration and color. In chromoendoscopy, most of sessile serrated polyps and typical hyperplastic polyps showed star-like pattern, in contrast with traditional serrated adenomas most of which had fernor pinecone-like pattern. The differential diagnosis between traditional sessile polyp and the other two was possible with high accuracy. On the other hand, endoscopic distinction between sessile serrated polyp and typical hyperplastic polyp was not easy, except that the location and size were significantly different.
  
  
  CONCLUSIONS
  We can endoscopically differentiate between traditional serrated adenoma and sessile serrated polyp or typical hyperplastic polyp, but it is difficult to differentiate between the latter two.
authors.affiliation: Showa University, Northern Yokohama Hospital, Yokohama, Japan. kashi-md@xf6.so-net.ne.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kashida
authors.forename: Nobunao
authors.initials: N
authors.lastname: Ikehara
authors.forename: Shigeharu
authors.initials: S
authors.lastname: Hamatani
authors.forename: Shin-ei
authors.initials: SE
authors.lastname: Kudo
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Kudo
mesh_terms: D000236:Adenoma / Q000175:diagnosis / Q000473:pathology*; D003111:Colonic Polyps / Q000175:diagnosis / Q000473:pathology*; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D016099:Endoscopy, Gastrointestinal; D006801:Humans; D006965:Hyperplasia