1. Conclusion PEA, a rarely seen disease,is hard to differentiate from synovioma, fibrosarcoma or giant cell tumors, whose diagnosis depends on pathological examination.
   结论该病很少见，与滑膜肉瘤、纤维肉瘤及巨细胞瘤很难鉴别，确诊依靠病理检查。

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