age dependent tumor
;osteosarcoma, euing sarcoma, metastatic tumor
FCD(4-8세), NOF(older) 는 같은 pathology, age에 따라 나눔
site dependent
;epi : chondroblastoma, eosinophilic granuloma
dia : Ewing sarcoma, NOF, enchondroma, fibrous dysplasia
meta : 대부분
central : enchondroma, SBC, fibrous dysplasia
cortical : osteoid osteoma(nidus), NOF
giant cell tumor와 chondroblastoma는 epiphyseal plate로 구분
Ewing vs. osteomyelitis
chondrosarcoma vs. simple bone cyst
osteochondroma : exophytic
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