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(A) Low power view of low cellularity cartilaginous neoplasm pushing into marrow space (left) and circumferentially entrapping bone (right). (B) A high-power view of chondrosarcoma circumferentially entrapping pre-existing lamellar bone, which has also undergone osteonecrosis.(C) Chondrocyte hypercellularity and cytologic atypia in the setting of bony entrapment.
