Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding AP single view chest examination of ___ . Cardiac enlargement as before . Unchanged appearance of thoracic aorta , thus only mildly widened and elongated without evidence of local contour abnormalities . The pulmonary vasculature shows a mild upper zone redistribution pattern and some perivascular haze on the bases . On previous examination identified pleural effusion obliterating the right lateral pleural sinus has increased slightly . There are some crowded pulmonary vessels on the right base , but no conclusive evidence for infiltrates is present . The left - sided retrocardiac pulmonary density persists and as before , is indicative of a sizeable atelectasis in the left lower lobe . The lateral view discloses that also some small amount of pleural effusion reaches into the posterior left - sided pleural space . Previously identified calcification in right - sided sixth anterior rib remains unchanged .
    OUTPUT:
    
Bilateral pleural effusions , slightly increasing and suggestive of CHF . Left - sided retrocardiac atelectasis persists and possibility of infective course is likely . No other interval changes are seen .