Pneumocystis carinii pneumonia following corticosteroid therapy for giant cell arteritis.

Pneumocystic carinii pneumonia (PCP) is a well-recognized complication of immunodeficiency disorders. PCP has been reported in patients with connective tissue diseases, but most were on cytotoxic drugs. We report a case of PCP occurring in a patient with giant cell arteritis who was receiving high dose prednisone. To our knowledge this complication has not been previously reported.