Figure 2. Photograph of an axially sectioned whole-mounted specimen (hematoxylin-eosin stain) shows multiple cartilaginous lobules (*) replacing the femoral marrow with deep endosteal scalloping anteriorly, cortical penetration, and a small focus of soft-tissue extension (large arrows), findings that represent conventional intramedullary chondrosarcoma. Enchondral ossification at the periphery of the chondroid lobules causing a ring-and-arc appearance is also seen (small arrows).