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KMID : 0613319980040010059
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Journal of the Korean Bone and Joint Tumor Soceity
1998 Volume.4 No. 1 p.59 ~ p.64
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Dedifferentiated Parosteal Osteosarcoma - A case report -
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Kim Tai-Seung
Song Sang-Jun
Choi Il-Yong
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Abstract
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Parosteal osteosarcoma is characterized as a densely ossifying lesion, usually occurring on the surface near the metaphyses of a long bone. The histological pattern is a well- differentiated mature bone trabeculae with a hypocellular spindle-cell stroma. The cytological details are those of a low-grade malignant lesion. The natural history of this lesion is indolent local growth, late invasion of the underlying bone, and infrequently, distant metastasis. However, there is a significant risk of eventual dedifferentiation into a high-grade lesion. We report here a case of parosteal osteosarcoma dedifferentiated into a high-grade lesion, which occurred in the left distal femur of a 40-years-old woman, and discuss the experience in detail.
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KEYWORD
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Parosteal osteosarcoma, Dedifferentiation
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