Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD / pacemaker device is noted with single lead terminating in the right ventricle . Dual lumen central venous catheter tip terminates in the proximal right atrium . Moderate to severe enlargement of cardiac silhouette is unchanged . Lung volumes are low . Mediastinal and hilar contours are stable . There is crowding of the pulmonary vascular markings , with probable mild pulmonary vascular congestion . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Minimal atelectasis is seen in the lung bases .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis and probable mild pulmonary vascular congestion .