Abnormality of the immune system

What it means

An abnormality of the immune system.

The immune system is composed of organs and interdependent cell types that collectively protect the body from infections and from the growth of tumor cells. The organs of the immune system comprise the bone marrow, the spleen, the thymus,the lymph nodes, and the cell types comprise B cells, T cells, natural killer cells, granulocytes,dendritic cells, and macrophages.

Rare diseases that can present with this15

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