What does lung nodule mean?

Pulmonary nodules are pulmonary sarcoidosis, a granulomatous disease of multiple systems and organs. At present, the cause of pulmonary sarcoidosis is still unclear, which may be caused by cellular immune function and humoral immune function disorder. Asymptomatic pulmonary sarcoidosis can not be treated, and there is a possibility of self-healing; if SACE levels are significantly increased, hormone drugs should be used for treatment.