Granuloma
Inflammatory aggregation of immune cells
Granuloma
A granuloma (pl. granulomata) is an aggregation of macrophages (along with other cells) that forms in response to chronic inflammation. This occurs when the immune system attempts to isolate foreign substances that it is otherwise unable to eliminate. Such substances include infectious organisms including bacteria and fungi, as well as other materials such as foreign objects, keratin, and suture fragments.
Read on Wikipedia · Image Sanjay Mukhopadhyay, Public domain
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