Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited due to patient 's rotation and low lung volumes . The heart size is difficult to assess given the degree of rotation but may be mildly enlarged . The aortic knob is calcified . Assessment of the mediastinal and hilar contours is limited . There are low lung volumes with crowding of the bronchovascular structures and mild pulmonary vascular congestion . Streaky bibasilar airspace opacities are present . No large pleural effusion or pneumothorax is seen . Widened right AC joint is chronic , unchanged from ___ .
    OUTPUT:
    
Limited exam . Mild pulmonary vascular congestion and bibasilar airspace opacities , possibly atelectasis in the setting of low lung volumes , but infection or aspiration are not excluded .