Pediatric Pneumocystis Jiroveci Pneumonia Etiology: in immunocompromised hostImaging: ground glass + interlobular septal thickening, may have cystic spaces / bullae, pleural effusion rare, can look like anything on CXR Radiology Cases of Pneumocystis Jiroveci Pneumonia CXR AP shows bilaterally diffuse, symmetrical, fine reticular infiltrates.