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Radiology, Vol 181, 461-467, Copyright © 1991 by Radiological Society of North America

ARTICLES

Rectal carcinoma: staging at MR imaging with endorectal surface coil. Work in progress

TW Chan, HY Kressel, B Milestone, J Tomachefski, M Schnall, E Rosato and J Daly
Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104.

To increase the accuracy of local staging of rectal carcinomas at magnetic resonance (MR) imaging, the authors placed on endorectal coil mounted on a balloon in a position adjacent to the lesion. Use of such a local coil resulted in increased signal-to-noise ratio compared with use of a body coil; higher-resolution images were obtained because the field of view was decreased. The depth of wall invasion by rectal carcinoma was correctly staged with endorectal MR imaging in 11 of 12 patients. In the detection of perirectal adenopathy, use of MR enabled correct identification of positive perirectal nodes in four of seven patients (57%). There were no false-positive diagnoses of perirectal adenopathy at MR. Endorectal MR imaging is an evolving and promising technique for the local staging of rectal carcinomas, but further studies are needed to demonstrate its efficacy.


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