Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous study which accentuates the size of the cardiac silhouette which appears moderately enlarged . Superior mediastinal widening is re - demonstrated , potentially due to the presence of mediastinal fat and low lung volumes . Atherosclerotic calcifications of the aortic knob are present . There is crowding of bronchovascular structures without overt pulmonary edema . Small hiatal hernia persists . Apart from atelectasis at the lung bases , no focal consolidation , pleural effusion or pneumothorax is present . The osseous structures are diffusely demineralized with moderate degenerative changes seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .