True regarding osteosarcoma is -
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).
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