Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The aorta is tortuous . Lung volumes are low with crowding of bronchovascular structures but no overt pulmonary edema . Small left pleural effusion with patchy atelectasis is noted at the left lung base . Minimal atelectasis is also noted within the right lower lobe . No pneumothorax is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Small left pleural effusion with associated left basilar atelectasis .