Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment is limited by patient rotation and the patient 's head obscuring the right mid and upper lung fields . Patient is status post median sternotomy . Heart size appears at least mildly enlarged . Mediastinal and hilar contours are difficult to assess given the degree of rotation . Lung volumes are low . Patchy opacities are seen in the lung bases , potentially atelectasis . There is crowding of bronchovascular structures with mild pulmonary vascular congestion , perhaps slightly improved in the interval . No large pleural effusion or pneumothorax is detected on this supine exam . Remote left - sided rib fractures are present .
    OUTPUT:
    
Limited study due to patient positioning and rotation . Mild pulmonary vascular congestion , perhaps slightly improved in the interval with bibasilar atelectasis .