Fig. 1.

Chest high-resolution computed tomography (HRCT) images of the upper and lower lobes. (A) On the day of admission, extensive ground-glass opacities and consolidation were seen predominantly in the left lung, and traction bronchiectasis and volume reduction were also present. (B) On the 26th hospital day, antiviral therapy and corticosteroid treatment including two rounds of steroid pulse therapy resulted in a marked reduction of ground-glass opacities and consolidation although reticular shadows indicative of fibrotic changes were still present. (C) On the 39th hospital day, ground-glass opacities and consolidation reappeared in the bilateral lungs superimposed on reticular shadows indicating residual fibrotic change after COVID-19 pneumonia along with hemoptysis, purpura, and thrombocytopenia. A diagnosis of diffuse alveolar hemorrhage was made by bronchoalveolar lavage after the patient was intubated. (D) On the 51st hospital day, HRCT findings improved markedly with the increase in corticosteroid dosage.