Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There has been significant interval increase in right pleural effusion with only partial residual aeration of the right upper lobe and shift of midline structures to the left . The left lung is clear . Heart size can not be assessed . Bony structures appear intact .
    OUTPUT:
    
Large right pleural effusion with collapse of right middle and lower lobes and mild leftward shift of midline structures . Thoracentesis advised .