"streamer pattern – well-formed bony trabeculae with intermeddled spindle cell fascicles (most common)"
"fibrous dysplasia-like – haphazard arrangement of trabeculae looking like Chinese calligraphy"
"desmoplastic fibroma-like – predominant background of spindle cells with abundant collagen"
"MDM2 amplification is a further desirable criterion."
"possible focal necrosis, haemorrhage or fluid-filled cavities"
"form, location and size"
"History and etymology"
"myositis ossificans: the ossification pattern of parosteal osteosarcoma shows progressively increased ossification from the centre to the periphery (hardened heart); the ossification pattern of myositis ossificans is the opposite, with the densest ossification at the periphery (soft heart) and usually associated with soft tissue oedema 5"