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What is a pulmonary granuloma and how does one form in someone's lung. Are they dangerous?


Granulomas are the most common lung tissue calcifications that are seen in chest x-ray imaging reports. They are generally not dangerous.

"A granuloma is a small area of inflammation in the body due to tissue injury, such as from an infection. Granulomas most often occur in the lungs but can occur in other parts of the body as well. They typically cause no signs or symptoms and are found incidentally on an X-ray done for some other reason. Although granulomas are noncancerous (benign), they may resemble cancer on an X-ray.

The most common cause of granuloma is histoplasmosis, a fungal infection that primarily affects the lungs. Most people with pulmonary histoplasmosis never suspect that they have the disease. Granulomas due to histoplasmosis are usually visible on X-rays because they become calcified and have the same density as bone.

A doctor may make a diagnosis of granuloma by a chest X-ray or computerized tomography (CT) scan. The affected tissue usually shows scarring and calcification characteristic of a granuloma. Granulomas typically require no treatment."