高密度影，呈灰白色，特点对X光的吸收不一样多。
其余3个病灶为均匀高密度影。
CT可区分高密度影是关节腔游离体还是软组织内钙化或关节囊钙化。
CT can differentiate freebodys in the joint cavity with the calcification of the soft tissue or joint sac.
CT异常率为82 .5 %，主要表现为片状和圆形的低密度影和少量的高密度影。
The abnormal rate of CT was 82.5% in all patients, and flaky and circular focus were chief manifestations.
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