Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains moderately enlarged . The aorta is tortuous . Mediastinal and hilar contours are similar . Lung volumes are slightly low which causes mild crowding of bronchovascular structures , but no overt pulmonary edema is present . Linear opacities in the lung bases likely reflect areas of atelectasis . Assessment of the right lung apex is is slightly obscured by the patient 's neck and chin projecting over this region , but no pneumothorax is identified . No pleural effusion or focal consolidation is present . There are moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Moderate cardiomegaly and bibasilar atelectasis . No pulmonary edema .