Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal view of the chest demonstrates patient 's chronic moderate right pleural effusion with associated pleural thickening . There is increased opacity in the right lung base since ___ . The left lung remains essentially clear . There is left apical scarring . There is no left pleural effusion . No pneumothorax . Hilar and mediastinal silhouettes unchanged . Heart size top normal . Patient is status post medial sternotomy and CABG . Partially imaged upper abdomen is unremarkable . Bones are diffusely demineralized .
    OUTPUT:
    
1 . Increased airspace opacity in the right lung base , may suggest atelectasis or infection in the appropriate clinical setting . 2 . Stable appearance of patient 's known chronic right pleural effusion .