Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large right - sided pleural effusion . Minimal right - sided aerated lung seen superiorly . There is no leftward mediastinal shift suggesting significant component of underlying right lung atelectasis . The left lung is clear . The cardiomediastinal silhouette can not be adequately assessed . No acute osseous abnormalities .
    OUTPUT:
    
Large right pleural effusion with minimal aerated lung superiorly . No mediastinal shift .