Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is difficult to assess due to the presence of left basilar opacity which may reflect atelectasis but infection can not be excluded . There is mild elevation of left hemidiaphragm which appears chronic . Small left pleural effusion may be present . There is mild pulmonary vascular congestion . No pneumothorax is seen . Old right clavicular and old left rib fractures are seen .
    OUTPUT:
    
Left basilar opacity may reflect atelectasis , but infection can not be excluded . Elevated left hemidiaphragm . Probable small left pleural effusion . Mild pulmonary vascular congestion .