Abnormality of the medullary cavity of the long bones

What it means

An abnormality of the medullary cavity (medulla, innermost part), which is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored.

Rare diseases that can present with this1

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