Dyspnea

•Pneumocystic carinii pneumonia is most common etiology (75%)

•usually present as subacute illness with constitutional symptoms: fever, night sweats and progressive non productive cough.

•Chest X-ray typically shows diffuse interstitial infiltrates although many radiographic appearances are possible.

•Diagnosis with cyst or trophozites in sputum or bronchio alveolar lavage (98%)

•Treatment with either trimethoprim sulphamethoxazole or pentamidine.