Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette and mediastinum are normal . There are developing densities at the lung bases . This may represent atelectasis or alternatively aspiration . There are no signs for overt pulmonary edema . No pleural effusions or pneumothoraces are identified .
    OUTPUT:
    
Hazy densities at the lung bases . Followup to resolution is recommended .