False-Negative Meniscal Tear in MR Imaging Using Non Fat-Suppressed Techniques
SUPHANEEWAN JAOVISIDHA, M.D.*, CHATHCHAI POOKARNJANAMORAKOT, M.D.**,
PATARAWAN APIYASAWAT,M.D.**, PARICHART ROJANAPLAKORN, M.Sc.***,
PIMJAI SIRIWONGPAIRAT, M.D.*
Affiliation : * Department of Radiology,
**Department of Orthopedic Surgery,
***Department of Nursing, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand.
AbstractMagnetic resonance (MR) imaging of menisci has a diagnostic accuracy of more than
90 per cent when the images are properly obtained. Errors in the interpretation of MR
images may be related to many problems, resulting in false positive or false negative
readings. We conducted this study to evaluate the prevalence of false negative results,
using arthroscopy as gold standard. Matched MR imaging (performed before July 1997)
and arthroscopic findings of the menisci in 63 consecutive patients were retrospectively
reviewed separately by imaging planes and sequences used, by the site of tear, and by the site
of meniscus (medial or lateral meniscus). The number and percentage of false-negative
results were recorded. We found that with non fat-suppressed MR techniques, missed tear
(false negative reading) of both menisci occurred predominantly in the meniscal body.
The prevalence depends on imaging plane and sequence used. Among the techniques
reviewed, sagittal T2-weighted (T2W) sequence had the highest prevalence of undetected
meniscal tear.
Keywords : Meniscus, MR Imaging, False-Negative
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