Most common malignant bone tumor: (A) Osteogenic sarcotoma, (B) Secondaries, (C) Osteoma, (D) Enchondroma
Answer is B. Primary bone tumors are considerably less common than bone metastases from other primary sites; metastatic disease is discussed at the end of this section. Primary bone tumors exhibit great morphologic diversity and clinical behaviors--from benign to aggressively malignant. ref : Robbins Basic Pathology, 9E,page-774