Think of bone lesions in 4 groups:

Aggressive features

• IDK what it is (aggressive but nonspecific features)

  • Very common in clinical practice; ddx by age.

    • Adult: mets/myeloma

    • Children: ewing/infection

• I know what it is! (lesion w/ characteristic imaging features)

  • Very rare in clinical practice: osteosarcoma, chondrosarcoma.

Nonaggressive features

• IDK what it is (nonaggressive but nonspecific features)

  • Very common in clinical practice; can say fibro-osseous lesion to sound smart.

• I know what it is! (characteristic imaging features)

  • Enchondroma, osteoid osteoma, non-ossifying fibroma, hemangioma, giant cell tumor, fibrous dysplasia.