Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity projecting over the lower posterior chest on the lateral view is not substantiated on the frontal view and may be due to atelectasis . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal . Mediastinal contours are unremarkable . No overt pulmonary edema is seen .
    OUTPUT:
    
Opacity projecting over the lower posterior chest on the lateral view is not substantiated on the frontal view and may be due to atelectasis , focal consolidation not entirely excluded .