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Abstract
The authors present a case of primary synovial osteochondromatosis of the ankle, as
demonstrated by magnetic resonance (MR). Ankle involvement by osteochondromatosis
is unusual. The characteristic MR findings are: target appearance of some loose bodies
with a low intensity peripheral rim and a center isointense to the soft tissues on
T1-weighted images, which remain unchanged on T2-weighted images. Conversely, other
loose bodies were characterized by homogeneous hyperintensity close to the bone marrow
on T1-weighted images, with loss of signal on T2-weighted images. The authors believe
that these findings are quite pathognomonic of a long-standing synovial osteochondromatosis.
Keywords
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© 1992 Published by Elsevier Inc.