Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Mild enlargement of the cardiac silhouette is present . The mediastinal and hilar contours are unremarkable . Crowding of bronchovascular structures is present with mild pulmonary vascular congestion . Patchy opacities are noted in the lung bases , which may reflect atelectasis , but infection or aspiration is not excluded . There is likely a small left pleural effusion . No pneumothorax is detected . Marked degenerative changes of the left glenohumeral joint are present . There are moderate multilevel degenerative changes seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild pulmonary vascular congestion and patchy opacities in the lung bases , possibly atelectasis . Infection or aspiration can not be excluded in the correct clinical setting . Possible trace left pleural effusion .