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Cytomegalovirus pneumonia in a 51-year-old man with chronic myelogenous leukemia who underwent bone marrow transplantation. (a) Thin-section CT scan of the right lung shows centrilobular ground-glass opacities in addition to nodules and tree-in-bud opacities (arrow). (b) Photomicrograph (original magnification, ×400; hematoxylin-eosin stain) shows cytomegalic inclusion bodies in the lung tissue (arrows).
Rossi, SE et al Tree-in-Bud Pattern at Thin-Section CT of the Lungs: Radiologic-Pathologic Overview RadioGraphics Vol. 25, No. 3 2005

CMV – Multicentric Pneumonia
Cytomegalovirus pneumonia. CT scans in a 31-year-old woman with a history of type 1 diabetes mellitus complicated by end-stage renal disease. The patient had previously undergone kidney and pancreas transplant and presented with 2 days of right lower quadrant abdominal pain associated with nausea and vomiting. Upon further work-up, patient was found to have cytomegalovirus viremia. (above) Axial and (be;low) coronal CT images demonstrate diffuse randomly distributed small pulmonary nodules (arrows), many of which are ill-defined and distributed in the secondary pulmonary lobules and perilymphatic regions.
Parekh, M et al Review of the Chest CT Differential Diagnosis of Ground-Glass Opacities in the COVID Era Radiology Vol. 297, No. 3 July 2020