Ferruginous body refers to an iron-containing pigment that appears in tissues affected by certain diseases such as tuberculosis. However, there are several synonyms to consider. For instance, hemosiderin is a related pigment that forms in tissues in response to abnormal breakdown of red blood cells. Another term used interchangeably with ferruginous body is hemosiderotic tissue, which suggests the accumulation of hemosiderin in body tissues. Finally, the term siderocalcinosis may be used to refer to the pathological accumulation of iron and calcium in tissues. While ferruginous body is a commonly used term in medicine, understanding its synonyms and related terms can help medical professionals to communicate more precisely about pathologies relating to iron and pigment metabolism.