Cystic pneumonia in a patient with AIDS

A 47-year-old man, HIV positive since 1991 and lost to followup for the last 10 years, presented in the emergency department for influenza-like syndrome, fever and cough. Pulmonary examination war unremarkable. Biological testing was noticeable for lymphocytopenia (lymphocyte 0.54 G/L) and uncontrolled HIV infection: high viral load (HIV1- RNA 5.81 log copies/mL), low CD4 T-cells level (CD3+CD4+ Tcells 7 mm³ , CD3+CD8+T-cells 83 mm³). Chest CT showed multiple bilateral cystic lesions, centrilobular micronodules and condensation, but lacked ground glass and mediastinal adenopathy. Due to the advanced CD4 T-cell depletion infectious disease was most likely, with among them Pneumocystis jirovecii, past tuberculosis/active atypical mycobacterial infection and more infrequent paragonimiasis, echinococcosis and coccidioidomycosis. In this case, Cystic Pneumocystis Pneumonia (PCP) was diagnosed on sputum induced positive P. jirovecii quantitative PCR, while differential diagnosis were excluded through sputum and serum testing. Previously described as one of the hallmark of PCP with diffuse ground glass opacities, cysts seems to become quite exceptional in non-AIDS patients. They have almost disappeared since the introduction of antiretroviral drugs. Interestingly, these cysts, unrelated to their size, tend to resolve within a year. It is noteworthy that this radiological pattern (lack or few ground glass and mostly apical cysts) is also characteristic of primary inhaled pentamidine prophylaxis failure. Finally, this case highlight to remember this simple saying: there is cyst in pneumocystis pneumonia. (author)