Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval development of a new enlarged left pleural effusion with tracking in the fissures . Small amount of adjacent left - sided compressive atelectasis . The right lung is clear . No pulmonary edema or pneumothorax . Chronic bilateral apical scarring . Stable cardiomediastinal contours and hila .
    OUTPUT:
    
1 . New large left pleural effusion . 2 . Can not adequately evaluate for any processes contributing to the left pleural effusion , and a CT chest could be performed to evaluate underlying structures .