Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of cardiac silhouette is unchanged . The mediastinal contours are stable . Atherosclerotic calcifications of the thoracic aorta are again noted . There is no pulmonary vascular congestion . Enlargement of the hila bilaterally reflects dilated pulmonary arteries , suggestive of pulmonary arterial hypertension . Small right pleural effusion persists . Bibasilar atelectasis is noted and elevation of the right hemidiaphragm is again seen . There is no pneumothorax . Multilevel degenerative changes in the thoracic spine are again present . Cholecystectomy clip in the right upper quadrant the abdomen is again noted .
    OUTPUT:
    
Unchanged small right pleural effusion and bibasilar atelectasis . Bilateral hilar enlargement suggestive of underlying pulmonary arterial hypertension .