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Radiology, Vol 197, 655-658, Copyright © 1995 by Radiological Society of North America

ARTICLES

Spinal cord ependymomas: MR imaging features

MJ Fine, II Kricheff, D Freed and FJ Epstein
Department of Radiology, New York University Medical Center, NY 10016, USA.

PURPOSE: To assess the magnetic resonance (MR) imaging characteristics of spinal intramedullary ependymomas. MATERIALS AND METHODS: MR images obtained in 25 patients (aged 12-73 years) with proved intramedullary ependymomas were retrospectively reviewed. T1- and T2-weighted images were obtained in all patients. Gadopentetate dimeglumine was intravenously administered in 23 patients; enhanced sagittal and axial T1-weighted spin-echo images were reviewed. RESULTS: All tumors had hyperintense signal on T2-weighted images. In the 23 patients who received contrast material, all tumors became enhanced; enhancement was heterogeneous in 15 patients and homogeneous in eight patients. Twenty tumors had sharply defined, enhanced borders. Nineteen tumors were centrally located in the spinal cord. A hypointense rim on T2-weighted images was noted in five patients. CONCLUSION: Intramedullary ependymomas become enhanced after administration of gadopentetate dimeglumine; the enhanced borders are usually sharply marginated. They are characteristically located centrally in an expanded spinal cord. Hemosiderin is often present at the periphery of cervical ependymomas.


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