A rare case of sarcoidosis with necrotizing mediastinal lymphadenitis misdiagnosed as multidrug-resistant tuberculosis (MDR- TB).

Sarcoidosis, a multisystem disorder of unknown cause, is characterized by the presence of non-caseating granulomas and the proliferation of epithelioid cells. Sarcoidosis mostly affects the lungs and mediastinal lymph nodes in 90% of cases. Caseation and necrosis are very rare.