True regarding osteosarcoma is -
Occurs because of proliferation of osteoclasts
Sunray appearance in X-ray indicates new bone formation
Affects mainly males in 5th or 6th decade
Lymphtic metastasis is most common
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).