What is a cluster of calcified granulomas called?

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A typical calcified granuloma is a benign nodule from a previous inflammation. Granulomas frequently calcify. When it's in the lung, it's called pulmonary nodule. 

Granulomas can exist in other organs, as well. 

Granulomas is a defensive mechanism that triggers the body to "wall off" foreign invaders such as bacteria or fungi to keep them from spreading. Common causes include an inflammatory condition called sarcoidosis and infections such as histoplasmosis or tuberculosis.

Granulomas in people without symptoms almost never require treatment or even follow-up imaging tests.

Granuloma caused by infection with biological pathogens can form cell nodules with a special structure and become infectious granuloma. Foreign body granuloma is caused by foreign bodies. The lesions are centered on foreign bodies, surrounded by a large number of macrophages, foreign giant cells, fibroblasts and lymphocytes, forming nodular lesions. Non-necrotic epithelioid cell granuloma that occurs during sarcoidosis is called sarcoidosis granuloma. In tuberculosis, caseous necrosis can be calcified.