title: Characteristic magnifying narrow-band imaging features of colorectal tumors in each growth type.
abstract: OBJECTIVE
  We investigated the surface characteristics and vascular patterns of colorectal tumors according to growth type by means of magnifying narrow-band imaging (NBI).
  
  
  METHODS
  Four hundred ninety-seven colorectal tumors larger than 10 mm (204 tubular adenomas [TAs], 199 frankly invasive intramucosal carcinomas to shallow invasive submucosal [M/SM-s] carcinomas, and 94 deeply invasive submucosal [SM-d] carcinomas) were analyzed. These colorectal tumors were classified according to growth type as follows: polypoid type, n = 224; laterally spreading tumor-granular (LST-G) type, n = 133; and LST-non-granular (LST-NG) type, n = 140. Surface and vascular patterns were evaluated in relation to histology and growth type.
  
  
  RESULTS
  The absent and irregular surface patterns were observed in approximately 40 % of the SM-d carcinomas of the polypoid and LST-G type. The unclear surface pattern was more frequent in tumors of the LST-NG type than in those of other growth types, regardless of histology. Among TAs and M/SM-s carcinomas, the dense vascular pattern was most frequent in polypoid type, the dense and corkscrew vascular patterns were most frequent in the LST-G type, and the honeycomb and avascular and/or fragmentary patterns were most frequent in the LST-NG type. The avascular and/or fragmentary vessel pattern was more frequent in SM-d carcinomas than in TA and M/SM-s carcinomas, regardless of growth type.
  
  
  CONCLUSIONS
  A part of LST-NG was difficult to identify the NBI magnifying surface pattern. Although NBI magnifying findings were almost same in each type lesion in SM-d lesion, those of LST-NG were different from those of LST-G and polypoid type in M/SM-s lesion.
authors.affiliation: Department of Medicine and Molecular Science, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan.
authors.forename: Sayaka
authors.initials: S
authors.lastname: Takata
authors.forename: Shinji
authors.initials: S
authors.lastname: Tanaka
authors.forename: Nana
authors.initials: N
authors.lastname: Hayashi
authors.forename: Motomi
authors.initials: M
authors.lastname: Terasaki
authors.forename: Koichi
authors.initials: K
authors.lastname: Nakadoi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kanao
authors.forename: Shiro
authors.initials: S
authors.lastname: Oka
authors.forename: Shigeto
authors.initials: S
authors.lastname: Yoshida
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Chayama
mesh_terms: D015179:Colorectal Neoplasms / Q000098:blood supply* / Q000145:classification / Q000473:pathology*; D006801:Humans; D007413:Intestinal Mucosa / Q000098:blood supply / Q000473:pathology; D062048:Narrow Band Imaging / Q000379:methods*; D009361:Neoplasm Invasiveness