Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes have decreased compared to prior . Bibasilar patchy and linear opacities are likely due to atelectasis . Heart size is within normal limits . Mediastinal and hilar contours are unremarkable . There is no evidence for pulmonary edema , pulmonary consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Bibasilar opacities , likely due to atelectasis . If clinical suspicion for pneumonia persists , repeat radiograph with improved inspiratory level may be helpful for more complete assessment of the lung bases .