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* <spoiler text="What is sarcoidosis?">The exact cause of sarcoidosis is unknown. Sarcoidosis is characterized by non-caseating granulomas in many tissues and organs.</spoiler>

* <spoiler text="What is the characteristic phenotype of sarcoid granulomas?">The typical characteristic of a sarcoid granuloma is a non-caseating granuloma which consists of an aggregate of tightly-clustered epitheliod cells, often with Langhans’ or multinucleated giant cells. Occasionally, asteroid bodies may be seen.</spoiler>