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American Journal of Roentgenology, Vol 154, 585-592, Copyright © 1990 by American Roentgen Ray Society

ARTICLES

Tumors of the nasopharynx and adjacent areas: MR imaging with Gd-DTPA

T Vogl, S Dresel, LT Bilaniuk, G Grevers, K Kang and J Lissner
Department of Radiology, University of Munich, West Germany.

The purpose of this study was to describe our experience with Gd-DTPA- enhanced MR imaging in the evaluation of the most common nasopharyngeal tumors. Forty-two patients with tumors of the nasopharynx and adjacent spaces had MR imaging before and after IV injection of Gd-DTPA. Images were obtained with a 1.0-T superconducting magnet imaging system in transverse, coronal, and sagittal planes with T1- and T2-weighted sequences. MR images were compared with CT scans and tumor histology. The studies were categorized by using a grading system with grades ranging from unsatisfactory (grade 0) to optimal (grade 3). Contrast- enhanced MR enables better identification of small anatomic details such as both palatini muscles and the pharyngobasilar fascia. MR after Gd-DTPA was superior to CT in all cases except for tumors of the maxillary sinuses. MR with Gd-DTPA is recommended for tumors that are small and difficult to detect on the initial nonenhanced MR examination or that show subtle infiltrations. Because of the increased cost and longer examination time, MR with Gd-DTPA does not need to be done when large tumors are well delineated.
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