Name the subtypes of osteosarcoma.
Conventional, telangiectatic, low-grade central, small cell, parosteal, periosteal, high-grade surface.
Lytic lesion involving the cortex of the medial diaphysis, metaphysis, and epiphysis of the distal femur. The remaining medullary bone shows a permeative lytic pattern. The mass has a wide zone of transition. There is a lamellated periosteal reaction with a Codman triangle adjacent to the mass.
Impression of spherical soft tissue component, however, there is no clear osteoid tumor matrix. No joint involvement.