Pulmonary sarcoidosis is a rare lung disease that results from inflammation. Currently the cause is unknown. It usually develops in people between ages 20 to 50.
Pulmonary sarcoidosis causes small lumps, called granulomas, which generally heal and disappear on their own. However, for those granulomas that do not heal, the tissue can remain inflamed and become scarred or fibrotic. This may lead to loss of lung volume (the amount of air lungs can hold) and abnormal lung stiffness.
Pulmonary sarcoidosis can develop into pulmonary fibrosis, which distorts the structure of the lungs and can interfere with breathing.
Bronchiectasis, a lung disease in which pockets form in the air tubes of the lung and become sites for infection, also can occur.