Objective: to determine CT features of pneumonia depending on the etiological agent in patients with LHP after chemotherapy. Materials and methods. 52 patients with LPD, who developed pneumonia, underwent chest CT. In all patients, the causative agent of lower respiratory tract infection was verified by microbiological diagnostic methods. Results. In the first 48 hours from the onset of the viral pneumonia, thickening of the interlobular septa and of peribronchial interstitium, part-solid and solid nodules, and hydropericardium (p < 0.01) were detected. After 48 hours, ground glass opacity, Intralobular septal thickening, “crazy-paving” pattern and hydropericardium were more often detected (p < 0.001). In the first 48 hours from the onset of invasive pulmonary mycosis, a halo sign (p < 0.01) and the prevalence of changes in the upper parts of the lungs (p < 0.05) were detected. After 48 hours, halo sign (p <0.01), a random distribution of nodules and solid nodules (p < 0.05) were detected. Conclusion. Viral o