Pulmonary sarcoidosis: from clinical features to pathology- narrative review.

Sarcoidosis is a multisystem disease with unknown causes. The prevalence of sarcoidosis that occurs worldwide is highly variable. It is pathologically characterized by the formation of non-necrotizing epithelioid cell granuloma, mainly affecting the respiratory tract and involving extrapulmonary organs including the skin, heart, extrathoracic lymph nodes, central nerves and eyes.