Hi There After going through your query I understand your concern. I would like to tell you that Sarcoidosis is a multi-system inflammatory disease in which small nodules ( granulomas) of inflamed tissue develops in Body s organs. Mostly it involves Lungs but can affect other organs too. Cause of Sarcoidosis is unknown as of now, how ever genetic and environmental factors seems to play role. Sarcoidosis rarely causes kidney failure. But for kidney failure evaluation , diagnosis and a proper treatment is required to avoid Kidney failure related complications. Its recommended to consult a Nephrologist for further management. Hope this will help Kind Regards