Telangiectatic osteosarcoma is an uncommon variant of osteosarcoma that consists of multiple blood-filled cavities. The location and age-distribution of the lesion are like conventional osteosarcoma. 

On plain x-ray, the lesion appears as a lytic destructive lesion with minor amounts of matrix mineralization or periosteal reaction.

On MRI the lesion contains multiple cysts filled with blood with multiple fluid-fluid level areas. These findings are not specific and might be seen in giant cell tumors or aneurysmal bone cysts.