Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Ill - defined bilateral central perihilar opacities correspond to ground - glass opacities on the chest CT examination from ___ , which may reflect atypical infection , inflammation , or blood . The overall appearance is minimally changed since the ___ radiograph . There is no pneumothorax or pleural effusion . An endotracheal tube and orogastric tube are unchanged in position .
    OUTPUT:
    
Persistent central bilateral pulmonary parenchymal opacities , corresponding to ground - glass opacities on recent chest CT , which may reflect fluid , hemorrhage , or atypical infection . The overall appearance is minimally changed since the ___ radiograph .