Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The patient is status post median sternotomy and CABG . Left - sided pacemaker device with leads terminating in right atrium and right ventricle is present . Curvilinear calcification on the lateral view along the left atrial and left ventricular contours is likely pericardial in etiology . Heart size is mildly enlarged but likely accentuated due to the low lung volumes . Mediastinal contours are unremarkable . There is no pulmonary vascular congestion . Patchy and linear opacities within the lung bases are likely reflective of atelectasis . No pleural effusion or pneumothorax is seen . Mild loss of height of a mid / low thoracic vertebral body is noted . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Probable pericardial calcifications .