Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal patchy opacities are noted in the lung bases which may reflect areas of atelectasis . No pleural effusion , focal consolidation or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacities in lung bases may reflect atelectasis , though early infection is not excluded in the correct clinical setting .