Primary neoplasmsof humanskeleton are rare, accounting for 0.2% of overall human tumor burden. Osteosarcoma accounts for 15-35% of all primary bone tumors. While osteosarcoma of jaw bones are even rarer, representing 4-8% of all osteosarcomas. Peak incidence for jaw osteosarcoma is 3rd-4thdecade, whileosteosarcomas of long bonesshow a bimodal agedistribution. Here we report anunusual case historyof a 54yrs old male with swelling in anterior gingiva of maxillawith mobility of teeth, which on x-ray was defined as non-contributory, andon incisional biopsy was diagnosed as giant cell granuloma. However on histopathological examination after wide surgical excision,it showed large areas of lobular malignant cartilage with few areas of disorganized tumor osteoidandatypical spindle cells, and was reported as chondroblastic osteosarcoma.
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