<prompt> Which of the following condition is considered as a premalignant condition for secondary osteosarcoma?Pagets diseaseEnchondromatosisDiaphyseal aclasisAll of the above  <response>: Pre-malignant bone lesions of secondary osteosarcoma : Pagets disease Diaphyseal aclasis Enchondromatosis Post-radiation Fibrous dysplasia Reference: Maheshwari; Essential Ohopaedics 9th ed; Page no: 242 