Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer device is noted with leads terminating in the right atrium and right ventricle . Mild cardiomegaly is unchanged . Atherosclerotic calcifications are noted within the aortic knob . The mediastinal and hilar contours are similar . Pulmonary vasculature is not engorged . Patchy opacity in the right lung base likely reflects atelectasis with similar blunting of the right costophrenic angle which may be due to a small pleural effusion or pleural thickening . Left lung is clear . Scarring within the lung apices is re - demonstrated . An inferior vena cava filter is noted within the upper abdomen , just to the right of midline . No acute osseous abnormalities are visualized .
    OUTPUT:
    
No substantial interval change from the prior study . Persistent patchy right basilar opacity , likely atelectasis , with unchanged blunting of the right costophrenic angle possibly due to a small pleural effusion or pleural thickening .