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Fibrous dysplasia
-Fibrous dysplasia is a benign disorder characterized by tumor-like proliferation of fibro-osseus tissue and can look like anything.
-FD most commonly presents as a long lesion in a long bone.
-FD is often purely lytic and takes on ground-glass look as the matrix calcifies.
-In many cases there is bone expansion and bone deformity.
-The ipsilateral proximal femur is invariably affected when the pelvis is involved.
-When FD in the tibia is considered, adamantinoma should be in the differential diagnosis. Discriminator:
If periosteal reaction or pain is present, exclude fibrous dysplasia, unless there is a fracture.
http://www.radiologyassistant.nl/en/4bc6176e56228
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