Abstract
The osteosarcoma that affects the jaw bones consists of a rare malignant neoplasm that has the capacity to produce immature bone or osteoid. A 60-year-old male patient attended a referral service exhibiting a rapidly growing lesion with nodular appearance, mucosa-like staining, hardened consistency, and painful symptoms located in the right mandibular body. The radiographic examination showed a mixed aspect of radiolucency and radiopacity, exhibiting the classic pattern of sun rays. The lesion was submitted to incisional biopsy, and the histopathologic examination revealed a malignant neoplasm of bone origin characterized by a proliferation of mesenchymal cells with significant pleomorphism and an intense deposition of irregular osteoid matrix. After the diagnosis of osteosarcoma was established, the patient underwent complete surgical resection of the lesion and is currently being followed up after 1 year without clinical-radiographic signs of relapse.
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