Abstract
Osteosarcoma is the most common primary neoplasm of the bone, typically affecting the metaphysis of femur or tibia in children or young adults. Metastasis of osteosarcoma in the oral cavity is rare. An 18-year-old male presented gingiva swelling with 1-month duration. Medical history revealed osteosarcoma in femur diagnosed in 2016 with metastasis in lung, mediastinum, and tibia. Intraorally, a lobulated nodule with ulcerative surface, measuring 2.0 x 2.0 cm was observed in left buccal and lingual attached gingiva surrounding teeth 37 and 38. The diagnostic hypothesis included non-neoplastic reactive lesions and metastasis of osteosarcoma. An incisional biopsy was performed, and histopathological diagnosis was compatible with osteosarcoma. The patient maintained palliative chemotherapy; however, he died 2 months after the metastasis diagnosis due to osteosarcoma complications.
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