Background Osteosarcoma is a most common, highly malignant bone tumor affecting children and adolescents in their early ages but it may occur in late ages after an initial bone disease such as Paget Disease . There are two types of osteosarcoma primary osteosarcoma Secondary osteosarcoma Telangiectatic osteosarcoma. It is  least common variant of osteosarcoma. This tumor mainly occur in metaphyseal region within the medullary cavity of long bones. It is characterized by blood filled vascular spaces lined by osteoblast cells. These osteoblast seperated by fibrus septa which contain malignant cells , multinucleated joint cells […]