Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A bedside AP radiograph of the chest demonstrates increasing mild bibasilar atelectasis but otherwise clear lungs . The hilar and cardiomediastinal contours are normal . There is perhaps very mild pulmonary vascular congestion but no pulmonary edema . There is no pneumothorax and a small right pleural effusion , if any . The left subclavian line is unchanged in position , terminating within the mid SVC .
    OUTPUT:
    
Mild bibasilar atelectasis and small right pleural effusion , if any . No evidence of pneumonia at this time .