TOPICS: Pneumocystis Jirovecii, fungi, yeast-like, disc-shaped cysts, methenamine silver stain, immunocompromised, AIDS, CD4 less than 200, interstitial pneumonia, ground glass opacities, pneumatoceles, lung biopsy, bronchoalveolar lavage, PCR, polymerase chain reaction, fluorescent antibody stain, TMP-SMX, trimethoprim, sulfamethoxazole, dapsone prophylaxis, pentamidine, atovaquone
