Abstract

Twelve consecutive cases of chondrosarcoma and its histologic variants are analyzed histo- pathologically and include seven cases of ordinary(classic) type, two cases of mesenchymal type, one case of clear cell type and two cases of peripheral secondary type arising from one of multiple osteochondromas. One of seven classic chondrosarcomas is classified as dedifferen- tiated chondrosarcoma, which recurred locally five vears after initial surgical removal. Histologic features of the variants are described in details, and differential points on histo- logic findings and clinical manifestation as well are discussed.