Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacification within the right mid and lower lung fields likely reflects a combination of a moderate pleural effusion and basilar atelectasis . Infection or aspiration in the right lung base can not be excluded . Cardiac silhouette size remains at least mildly enlarged , but difficult to assess on this exam due to the right basilar opacity . The aorta remains mildly tortuous . Pulmonary vasculature is not engorged . Left lung is clear . No pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Opacification within the right mid and lower lung fields likely reflects a combination of a moderate pleural effusion and right basilar atelectasis , though infection or aspiration can not be excluded .