Calcified hilar and mediastinal lymph nodes in an AIDS patient with Pneumocystis carinii infection.

An unusual radiologic manifestation of Pneumocystis carinii infection (enlarged, calcified hilar and mediastinal lymph nodes) in a patient with acquired immunodeficiency syndrome is described. This atypical manifestation caused significant diagnostic confusion. Recognition that P carinii infection can cause calcification of hilar and mediastinal lymph nodes may prevent this confusion and facilitate diagnosis and treatment.