True regarding osteosarcoma is -: (A) Occurs because of proliferation of osteoclasts, (B) Sunray appearance in X-ray indicates new bone formation, (C) Affects mainly males in 5th or 6th decade, (D) Lymphtic metastasis is most common
Answer is B. Osteosarcoma arises from primitive bone forming cells.
Sunray appearance and Codman's triangle indicate periosteal new bone formation.
Osteosarcoma occurs in childhood or young adult (10-25 years).
Blood metastasis is most common (not lymphatic).