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AJR Am J Roentgenol. 2007 Apr;188(4):953-9.

Flat colorectal neoplasms: definition, importance, and visualization on CT colonography.

Author information

  • 1Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Pungnap-2dong, Songpa-gu, 138-736, Seoul, Korea. seongho@amc.seoul.kr

Abstract

OBJECTIVE:

We discuss the definition of flat colorectal neoplasms, their clinical importance, CT colonography (CTC) findings, techniques for better visualization on CTC, and diagnostic pitfalls of such lesions.

CONCLUSION:

Flat lesions appear on CTC as plaque-shaped mucosal elevations with or without a central depression, thickened haustral folds, and nodular mucosal surfaces. The sensitivity and optimal techniques of CTC for the detection of flat lesions have not yet been established. Three-dimensional endoluminal fly-through may be helpful for lesion detection. Fecal tagging helps in the distinction of true flat lesions from feces. I.v. contrast enhancement and the review with intermediate soft-tissue window settings, although not routinely used for CTC, may also help lesion visualization.

PMID:
17377029
[PubMed - indexed for MEDLINE]
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