About Primary Malignant Chondroblastoma

According to the WHO histological classification of tumors (1972), chondroblastoma of bone belongs to benign cartilage-forming tumors. However, later literature data indicate the possibility of its malignancy. T.P. Vinogradova mentions its malignant form along with benign chondroblastoma, noting that "each benign form of tumor, as a rule, has its malignant analogue". There are 20 cases of malignant chondroblastoma described in the world literature and there are brief mentions of another 8 such cases. The work of V.N. Burdygin, A.K. Morozov and S.I. Lipkin [1] reports 6 own observations, A.K. Morozov reports 8 malignant chondroblastomas out of 113 studied, the publication of S.I. Lipkin - about 13 malignant chondroblastomas and 3 clear cell chondrosarcomas, which probably arose on the basis of chondroblastoma malignancy; according to V.L. Kotov and S.I. Lipkin, in 13 of 225 patients with chondroblastoma the tumor was verified as malignant.