Pneumocystis carinii pneumonia in a patient without a predisposing illness: case report and review.

A case of Pneumocystis carinii pneumonia in a patient without an underlying immunosuppressing condition is reported, and 12 other previously reported cases are reviewed. When compared with Pneumocystis carinii pneumonia in association with AIDS and in other immunosuppressing conditions, Pneumocystis carinii pneumonia in patients without predisposing conditions resembles more closely that seen in immunosuppressing conditions other than AIDS.