Fulminant descending mediastinitis secondary to infectious mononucleosis.

Descending mediastinitis is a rare, life-threatening condition caused by contiguous spread of oropharyngeal or cervical infection into the mediastinum. Infectious mononucleosis generally results in a self-limited illness characterized by fever, pharyngitis and lymphadenopathy. We present an exceptional case of an 18-year-old with infectious mononucleosis complicated by progressive bacterial superinfection and fulminant descending mediastinitis. After resuscitation, broad spectrum antibiotics, critical care support and definitive surgical management, they made a full recovery.