Pneumocystis pneumonia showing asymmetric ground-glass opacities with a mosaic pattern

Pneumocystis pneumonia following hematopoietic cell transplantation. High-resolution computed tomography (CT) image (1-mm collimation) at the level of the bronchus intermedius shows asymmetrical bilateral ground-glass opacities. Note sharp demarcation between the normal and abnormal lung resulting in a mosaic or geographic pattern.