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Radiology, Vol 174, 99-102, Copyright © 1990 by Radiological Society of North America

ARTICLES

Meninges: benign postoperative enhancement on MR images

JW Burke, AE Podrasky and WG Bradley Jr
Magnetic Resonance Imaging Laboratory, Huntington Medical Research Institute, Pasadena, CA 91105-3201.

In a group of 20 postcraniotomy patients who underwent magnetic resonance imaging performed with gadopentetate dimeglumine, 16 (80%) had nonneoplastic meningeal enhancement. This was seen as either enhancement of a local dural membrane or generalized meningeal enhancement. In a control group of 23 patients, only three (13%) had similar findings. The authors believe that postcraniotomy meningeal enhancement is most likely the result of a local inflammatory process or a diffuse chemical arachnoiditis caused by bleeding into the subarachnoid space at the time of surgery. The finding does not necessarily indicate leptomeningeal tumor spread or infection.


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