<prompt> True about pulmonary sarcoidosisSchauman asteroid bodies are pathognomic findingCD4CD82.5 in BALNon caseating granulomanone  <response>: Sarcoidosis is a granulomatous disorder of unknown etiology characterised by the presence of non-caseating granulomas.The use of the lymphocyte markers CD4 CD8 can be used to determine the CD4CD8 ratio of increased lymphocytes in the BAL fluid.A ratio of 3.5 is strongly suppoive of Sarcoidosis.Schaumann and Asteroid bodies can be seen,but they are non-pathognomic.Asteroid bodies are stellate inclusions with numerous rays radiating from a central core.They are seen in granulomas of Sarcoidosis,tuberculosis,leprosy,foreign body type,etc.Schaumann bodies are large concentric calcification often containing refractile calcium oxalate crystals.They are seen in Sarcoidosis,Beryllosis,hypersensitivity pneumonitis . Reference:Harrison s Medicine,Davidsons Medicine,22nd edition,page no:710,711. 