Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is increased right effusion now large in size , with associated compressive atelectasis of the right middle and lower lobe . Left lung is clear . No pneumothorax . Heart size is difficult to assess due to effacement of the right heart border . Mediastinal contour stable . Bony structures are intact .
    OUTPUT:
    
Large right pleural effusion , increased from prior with compressive right middle and lower lobe atelectasis .