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The following findings can be seen at diffent stages of AVN:

Stage I: MRI findings only, normal radiographs and CT
Stage II: Osteopenia, osteosclerosis, cysts
Stage III: Subchondral radiolucency (cresecent sign)
Stage IV: Flattening or collapse of the bone
Stage V: Joint space narrowing Stage VI: Joint extensively destroyed

Diff Dx:

Trauma, steroids, hemoglobinopathies, alcoholism, pancreatitis,Gaucher, radiation therapy

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