cryptogenic

Modifies a noun

• alveolitis: Occupational exposure to metal or wood dust and etiology of cryptogenic fibrosing alveolitis.
• epilepsy: For most people, there is no known cause for their epilepsy - this is referred to as cryptogenic epilepsy.
• cirrhosis: Was told is could be Cryptogenic Cirrhosis which means I think that they do not know how it came about.