Serrated adenoma of the colorectum: colonoscopic and histologic features.
BACKGROUND
Serrated adenoma is a recently recognized epithelial neoplasm of the colorectum. The aim of this study is to clarify the colonoscopic features of serrated adenomas.


METHODS
The endoscopic findings for 52 serrated adenomas of the colorectum were investigated; these were then divided into three groups according to surface features. The histologic type (tubular, tubulovillous or villous) and the incidence of high-grade dysplasia were compared among the three groups.


RESULTS
The surface under chromoscopy showed a hyperplastic pattern in 17 lesions, a cerebriform pattern in 18 lesions and a combined pattern in 17 lesions. The tubular type of serrated adenoma was predominant in the hyperplastic pattern group (94%), whereas the tubulovillous or villous histologic types were frequent in the cerebriform pattern (89%) and combined pattern (82%) groups. High-grade dysplasia was found in 18% of the combined pattern adenomas; the incidence was lower in hyperplastic (6%) or cerebriform pattern (0%) adenomas.


CONCLUSIONS
Surface features of serrated adenomas have a close correlation with their histologic type. A combined hyperplastic-cerebriform surface pattern under chromoscopy was seen only in serrated adenomas.
Matsumoto
T
T
Division of Gastroenterology, Department of Medicine, Kawasaki Medical School, Kurashiki-City, Okayama, Japan.
Mizuno
M
M
Shimizu
M
M
Manabe
T
T
Iida
M
M
Fujishima
M
M
D000236:Adenoma / Q000175:diagnosis / Q000473:pathology*; D000328:Adult; D000368:Aged; D001707:Biopsy, Needle; D003111:Colonic Polyps / Q000175:diagnosis / Q000473:pathology*; D003113:Colonoscopy / Q000379:methods*; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity