Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph , the lung volumes are significantly lower , with resultant crowding of the vascular structures and exaggeration of the cardiac silhouette which is likely within normal limits . There is no evidence of consolidation , edema , pleural effusion , or pneumothorax .
    OUTPUT:
    
Low lung volumes , but no evidence of acute cardiopulmonary process .