Osteosarcoma

Osteosarcoma is a malignant bone cancer; together with Ewing's sarcoma it accounts for most primary bone malignancies. There is a preference for the metaphyseal region of tubular long bones. 50% of cases occur around the knee. It is a malignant connective (soft) tissue tumor whose neoplastic cells present osteoblastic differentiation and form tumoral bone.

Symptoms

This type of bone tumor will first appears as a lump in long bones. Muscles will start to become weaker as the affected bone part is not as strong as normal bones. Since it is a bone tumor, the feel of it is bony but muscles are not necessarily attached.

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