A 25-year-old male presents with swelling over right knee since 1 month. The radiograph is shown here. Which of the following statement is true regarding this condition?: (A) It is a bone forming primary malignant tumour of bone, (B) Codmans triangle can be seen, (C) Hematogenous spread with lung metastasis are common., (D) All of above
Answer is D. Osteosarcoma This primary malignant bone-forming neoplasm is rare, but is still the commonest primary malignant lesion of bone after myeloma.