XXXX with massive ossification--a case report.

@entity1 @entity22880 @entity714 @entity5 @entity1352 @entity2277 @entity3 @entity24983
@entity1352 with extensive osteoid production is rare. We report a case of @entity1352 of monophasic type with massive ossification. The diagnosis was confirmed by reverse-transcripitase polymerase chain reaction (RT-PCR). The @entity1 was an-81-year-old @entity1 with recurrent @entity1352 in her right knee. The @entity5 was primarily excised in 1989. It recurred and was removed again in 1996. However, in 1999 a painful mass appeared in the same site. Preoperative plain radiography and computed tomography revealed a 5 x 5 cm soft tissue mass with extensive ossification in the medial side of the right knee joint. The @entity5 was widely excised in 2000. Soft X-ray examination revealed a trabecular pattern of ossification in the excised @entity5 . Microscopically the @entity5 was composed of hypercellular spindle cells with @entity714 with prominent ossification but no epithelial component. The @entity5 cells were positive for @entity2277 and focally positive for cytokeratin. The @entity5 expressed a sequence of @entity22880 - @entity24983 fusion gene transcript demonstrated by RT-PCR. Twelve years long survival of the present case without @entity3 in spite of repeated recurrence suggests a better prognosis of @entity1352 with ossification.
