Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal basilar atelectasis is seen . Subtle patchy left base retrocardiac opacity most likely due represents atelectasis versus less likely consolidation . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Mild basilar atelectasis . Subtle left base retrocardiac opacity seen only on the frontal view , not substantiated on the lateral view , most likely represents atelectasis , less likely consolidation .