Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP frontal view of the chest shows top normal heart size and uncoiling of the thoracic aorta , unchanged compared to the most recent prior study of ___ . There is some new perihilar linear atelectasis , most notable in the right middle lobe . No central pulmonary vascular congestion or edema is evident . Joint space narrowing and subchondral sclerosis is seen at the acromioclavicular joints .
    OUTPUT:
    
Linear atelectasis . No radiographic findings suggesting CHF .