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Natural History of Colorectal Adenoma Tsutomu Ishikawa 1 1Department of Diagnostic Radiology, National Cancer Center Hospital pp.167-178
Published Date 1989/2/25
DOI https://doi.org/10.11477/mf.1403106391
  • Abstract
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 In order to elucidate natural history of colorectal adenoma the size and structure of these lesions were radiologically observed in the patients in whom barium enema examinations were performed more than twice with an interval of a year or more (981 cases) and adenoma or cancer in adenoma was histologically confirmed (132 cases: 214 lesions).

 Average period of observation was 5.7 years (range: 1-15.7 years) and average number of barium enema examination 3.27 times. Histological types included tubular adenoma (190 lesions), tubulovillous adenoma (9 lesions), villotubular adenoma (9 lesions), villous adenoma (1 lesion) and cancer in adenoma (5 lesions).

 Serial observations on barium enema double contrast radiography showed no change in size in 112 lesions (52%), increase in size in 72 lesions (34%) and decrease in size or disappearance in 30 lesions (14%).

 Among 130 lesions of 5 mm or less in size at initial examination, no change in size group (74 lesions: 57%) dominated followed by increase in size group (44 lesions 34%) and diminution group (12 lesions: 9%). The combined group of no change in size and small change (±2 mm during observation period) accounted for 90 or more of the total number of the lesions.

 Increase in size group had no predilection for a specific site of the colon. More than 90% of the lesions did not change structurally either.

 Doubling time was 5.83 years for adenoma and 2.38 years for cancer in adenoma, thus suggesting slower growth rate for adenoma than that for advanced cancer.


Copyright © 1989, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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