Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment is limited by patient positioning and rotation . There are low lung volumes . Mild to moderate enlargement of the cardiac silhouette is grossly unchanged . The aorta appears diffusely calcified . The mediastinal and hilar contours are not substantially changed in the interval . Crowding of bronchovascular structures is noted and mild pulmonary vascular congestion is likely present . Streaky opacities in the lung bases may reflect areas of atelectasis . No large pleural effusion or pneumothorax is present .
    OUTPUT:
    
Limited study due to low lung volumes and patient rotation . Patchy opacities in the lung bases may reflect atelectasis but infection is not excluded in the correct clinical setting .