D2I2.
cancer

Bone (osteo)sarcoma

An osteosarcoma (OS) or osteogenic sarcoma (OGS) is a cancerous tumor in a bone. Specifically, it is an aggressive that arises from primitive transformed cells of mesenchymal origin and that exhibits osteoblastic differentiation and produces malignant osteoid.

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Plain-language summary adapted from Wikipedia. Not medical advice.