Fibrous dysplasia of the bones

What it means

Tumor-like growths that consist of replacement of the medullary bone with fibrous tissue, causing the expansion and weakening of the areas of bone involved. Especially when involving the skull or facial bones, the lesions can cause externally visible deformities. The skull is often, but not necessarily, affected, and any other bone or bones may be involved. Fibrous dysplasia can either effect isolated bones (Monostotic fibrous dysplasia) or also generalized all bones of the body (Polyostotic fibrous dysplasia).

Rare diseases that can present with this4

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category