Abstract
We reviewed histological and clinical findings of six cases of borderline chondrosarcoma and examined the expression of collagen types I, II, III, V, and VI by immunohistochemical analysis of these tumors. Borderline chondrosarcoma is defined as a cartilaginous tumor of bone resembling enchondroma on the basis of histomorphology. Clinically the tumor causes intermittent vague pain unrelated to physical activities. On radiographs borderline chondrosarcoma is characterized by evidence of endosteal erosion. We observed local recurrences in two cases treated by intralesional excision and marginal excision, and one of those cases died of inoperable local tumor recurrence. In our histological analysis based on tissue patterns, there were enchondromatous patterns in five cases, and chondrosarcomatous patterns in four cases. In the second recurrent tumor in one case, a chondrosarcomatous pattern was newly observed, and the recurrent tumor was found to be a low-grade chondrosarcoma cytologically in the other case. In the tumor matrix immunoreactivity for collagen types II and VI was predominant, with collagen types I, III, and V showing heterogeneous expression in some cases. In all cases rimming of tumor lobules with collagen types I a...Continue Reading
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