Case Report
Copyright ©2010 Baishideng. All rights reserved.
World J Gastrointest Oncol. Apr 15, 2010; 2(4): 205-208
Published online Apr 15, 2010. doi: 10.4251/wjgo.v2.i4.205
Perivascular epithelioid cell neoplasm of the colon
Hugh James Freeman, Doug L Webber
Hugh James Freeman, Department of Medicine (Gastroenterology), University of British Columbia, Vancouver BC V6T 1W5, Canada
Doug L Webber, Department of Pathology, University of British Columbia, Vancouver BC V6T 1W5, Canada
Author contributions: Freeman HJ and Webber DL contributed equally to this paper.
Correspondence to: Dr. Hugh James Freeman, MD, FRCPC, FACP, Department of Medicine (Gastroenterology), University of British Columbia, Vancouver BC V6T 1W5, Canada. hugfree@shaw.ca
Telephone: +1-604-8227216 Fax: +1-604-8227236
Received: November 23, 2009
Revised: December 19, 2009
Accepted: December 26, 2009
Published online: April 15, 2010
Abstract

A 17-year-old female presented with rectal bleeding from an ulcerated sigmoid mass in 1994. Initial pathological evaluation revealed a rare clear cell neoplasm of the colon, possibly originating from kidneys, adrenals, lung or a gynecologic source as a metastatic lesion. Extensive imaging studies were negative, and over the next 15 years, she remained well with no recurrence. The original resected neoplasm was reviewed and re-classified as a perivascular epithelioid cell neoplasm (PEComa). Although the long-term natural history of PEComas requires definition, increased clinical and pathological awareness should lead to increased recognition of an apparently rare type of colonic neoplasm that likely occurs more often than is currently appreciated.

Keywords: Perivascular epithelioid cell neoplasm; Carcinoid tumor; Colonic adenocarcinoma; Clear cell tumor