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DOI: 10.1148/rg.264055166
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RadioGraphics 2006;26:1085-1099
© RSNA, 2006

EDUCATION EXHIBIT

Evaluation of Benign and Malignant Rectal Lesions with CT Colonography and Endoscopic Correlation1

Alvin C. Silva, MD, Eric A. Vens, MD, Amy K. Hara, MD, Joel G. Fletcher, MD, Jeff L. Fidler, MD and C. Daniel Johnson, MD

1 From the Department of Diagnostic Radiology, Mayo Clinic, 13400 E Shea Blvd, Scottsdale, AZ 85259 (A.C.S., E.A.V., A.K.H.); and the Department of Radiology, Mayo Clinic, Rochester, Minn (J.G.F., J.L.F., C.D.J.). Recipient of Cum Laude and Excellence in Design awards for an education exhibit at the 2004 RSNA Annual Meeting. Received August 25, 2005; revision requested September 2 and received November 4; accepted November 7. A.K.H. has a licensure agreement with GE Medical Systems; all remaining authors have no financial relationships to disclose. Address correspondence to A.C.S. (e-mail: silva.alvin{at}mayo.edu).

Colorectal carcinoma is a significant cause of death from cancer in the United States, and early detection and treatment are critical. Computed tomographic (CT) colonography is a noninvasive, rapidly evolving technique that is a potential alternative to conventional colonoscopy for colorectal cancer screening. Rectal disease (eg, polyps, cancerous lesions, extramucosal lesions, inflammatory disease) can be especially challenging to diagnose with CT colonography because of several factors that can simulate or obscure the disease (eg, over- or underdistention, rectal tube, stool, artifacts). Familiarity with the spectrum of rectal diseases and with the potential pitfalls and technical limitations of CT colonography will help minimize interpretative and perceptual errors.

© RSNA, 2006






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