Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP Portable view of the chest was obtained . There has been interval resolution of previously seen pleural effusions , given that a lateral view was not obtained . Subtle patchy left base opacity most likely relates to atelectasis or vascular structures , although an early / mild consolidation in the appropriate clinical setting is difficult to exclude . The right lung is clear . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top normal . The aorta is calcified and tortuous .
    OUTPUT:
    
Subtle patchy left base opacity most likely relates to atelectasis or vascular structures , although in the appropriate clinical setting , early consolidation is difficult to exclude .