Matrix-Calcifications or mineralization within a bone lesion may be an important clue in the differential diagnosis.
-There are two kinds of mineralization: a chondroid matrix in cartilaginous tumors like enchondromas and chondrosarcomsa and an osteoid matrix in osseus tumors like osteoid osteomas and osteosarcomas.
-Chondroid matrix
Calcifications in chondroid tumors have many descriptions: rings-and-arcs, popcorn, focal stippled or flocculent.
left: Enchondroma, the most commonly encountered lesion of the phalanges.
middle: middle: Peripheral chondrosarcoma, arising from an osteochondroma (exostosis).
right: Chondrosarcoma of the rib.
http://www.radiologyassistant.nl/en/494e15cbf0d8d#a4b331e94d0f15
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