PT - JOURNAL ARTICLE AU - Verda Arshad AU - Nousheen Iqbal AU - Haider Ali Saleem AU - Muhammad Irfan TI - Case of undiagnosed pneumocystis pneumonia (PCP) AID - 10.1136/bcr-2017-221871 DP - 2017 Oct 24 TA - BMJ Case Reports PG - bcr-2017-221871 VI - 2017 4099 - http://casereports.bmj.com/content/2017/bcr-2017-221871.short 4100 - http://casereports.bmj.com/content/2017/bcr-2017-221871.full AB - Pneumocystis pneumonia (PCP) is an opportunistic fungal infection that is usually seen in immunocompromised patients, especially those with HIV, malignancies, organ transplants and on drug therapies like chemotherapy and steroids. PCP has subacute presentation in patients with AIDS which if left untreated gets worse and is a significant cause of morbidity and mortality. Here we present a case of PCP went undiagnosed, partially due to the patient being unaware of his HIV positive status and partially because no organism could be found under the microscope.