Secondary osteosarcoma are associated with -
Paget's disease
Osteogenesis imperfecta
Melhoreostosis
Ankylosing spondylitis
Ans. is 'a' i.e., Paget's disease Causes of secondary osteosarcomao Pagets Diseaseo Fibrous dysplasiao Radiationo Enchondromatosiso Hereditary multiple exostosiso Chronic osteomyelitiso Bone infarction
Metabolic Disorders Leading to Osteosclerosis