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American Journal of Roentgenology, Vol 172, 777-780, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

Pseudosparing of the endplate: a potential pitfall in using MR imaging to diagnose infectious spondylitis

LJ Wolansky, RF Heary, T Patterson, JS Friedenberg, J Tholany, JK Chen, N Patel and S Doddakashi
Department of Radiology, New Jersey Medical School/UMDNJ, Newark 07103, USA.

OBJECTIVE: The objective of this study was to describe a potential pitfall in using MR imaging to diagnose infectious spondylitis called "pseudosparing" of the endplate, in which the diseased endplate appears to be better defined than a healthy endplate. CONCLUSION: Poor definition of the endplate is a classic radiographic finding in infectious spondylitis; on MR imaging, however, increased conspicuity, or "pseudosparing," was common in our study. Pseudosparing occurs when the normal chemical shift artifact seen in healthy endplates is lost as a result of infiltration of the bone marrow by a pathologic process.
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