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Case Reports in Medicine
Volume 2009, Article ID 379578, 4 pages
Case Report

Colonic Endometriosis Mimicking Colon Cancer on a Virtual Colonoscopy Study: A Potential Pitfall in Diagnosis

1Department of Radiology, Northwestern Medical Faculty Foundation, Chicago, IL 60611, USA
2Department of Radiology, Johns Hopkins Medical Institutions, Baltimore, MD 21287-0801, USA
3Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21231, USA

Received 17 June 2009; Accepted 18 September 2009

Academic Editor: Dirk Beyersdorff

Copyright © 2009 Jonathan D. Samet et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Colonic endometriosis has been reported in the literature to mimic colon cancer. Patients can present with symptoms almost identical to colon cancer. We present an exemplary case of a woman who was found to have a mass on conventional colonoscopy. Virtual colonoscopy was instrumental in characterizing the obstructive sigmoid mass. A biopsy of the mass revealed sigmoid endometriosis.