Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with crowding of bronchovascular markings . There is discoid atelectasis of the bilateral upper lungs . Opacities in the retrocardiac region also likely represent atelectasis . There is no overt pulmonary edema . The heart is at least top normal in size . Apparent widening of the mediastinum is likely secondary to a combination of vascular congestion and adjacent atelectasis , with an acute mediastinal process felt less likely in the absence of any chest pain . There may be a small amount of pleural fluid on the left . There is no right pleural effusion . There is no pneumothorax . Repeat with better respiratory effort
    OUTPUT:
    
1 . No overt pulmonary edema . Discoid atelectasis of the bilateral upper lungs . Retrocardiac opacities , also likely representing atelectasis . 2 . Apparent widening of the mediastinum , likely secondary to a combination of vascular congestion and adjacent atelectasis , with an acute mediastinal process felt less likely in the absence of any chest pain . However , repeat AP radiograph with better inspiration is recommended . This preliminary report was reviewed with Dr . ___ , ___ radiologist .