Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Since chest CT performed 8 days ago , right pleural effusion has increased in size ( now moderate to large ) in this patient with a right lower lobe mass seen on prior chest CT . Increasing atelectasis is noted in the right middle lobe and right lower lobe . Left lung is clear . Cardiomediastinal silhouette is grossly unchanged . Bony structures are intact .
    OUTPUT:
    
Increased right pleural effusion ( likely a malignant effusion ) , now moderate to large with significant atelectasis in the right middle lobe and right lower lobe .