What is hemosiderin-laden macrophage?

Hemosiderin-laden macrophage is a type of macrophage that has ingested and stored hemosiderin, which is a breakdown product of hemoglobin. Hemosiderin is a brown pigment that gives the macrophages a characteristic appearance. These macrophages are found in the spleen, liver, and bone marrow, and they play an important role in recycling iron from old or damaged red blood cells.

Hemosiderin-laden macrophages are also found in areas of tissue damage or inflammation, where they help to clear away damaged tissue and promote healing. In some cases, the presence of hemosiderin-laden macrophages can be a sign of an underlying medical condition, such as a bleeding disorder or liver disease.