Most common feature of sarcoidosis on chest X-ray is:March 2011, March 2013

Ans. C: Bilateral hilar lymphadenopathySarcoidosis may be discovered unexpectedly on routine chest films as bilateral hilar lymphadenopathySarcoidosis/Sarcoid/Besnier-Boeck disease/Besnier-Boeck-Schaumann diseaseIt is a disease in which abnormal collections of chronic inflammatory cells (granulomas) form as nodules in multiple organs.The combination of erythema nodosum, bilateral hilar lymphadenopathy and ahralgia is called Lofgren syndrome.This syndrome has a relatively good prognosisChest X-ray changes are divided into four stages- Stage 1: Bihilar lymphadenopathy- Stage 2: Bihilar lymphadenopathy and reticulonodular infiltrates- Stage 3: Bilateral pulmonary infiltrates- Stage 4: Fibrocystic sarcoidosis typically with upward hilar retraction, cystic and bullous changes