Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD / pacemaker device is noted with leads terminating in the right atrium and right ventricle , unchanged . Rounded ring like calcification projecting over the midline lower thorax is compatible with a known left ventricular aneurysm . Heart remains moderately enlarged . The aorta is calcified . The hilar contours are stable , and there is improvement in the previous pattern of pulmonary vascular congestion . Small bilateral pleural effusions , left greater than right are present , with interval increase in the amount of fluid within the left pleural space . Dense opacification within the retrocardiac region is nonspecific and could reflect atelectasis , pneumonia , or aspiration . Linear opacities within the right lung base likely reflect chronic changes . There is no pneumothorax .
    OUTPUT:
    
1 . Small bilateral pleural effusions , increased on the left compared to the prior study . 2 . Opacification within the left lung base may reflect atelectasis , though infection or aspiration can not be excluded . 3 . Interval improvement in previous pattern of pulmonary vascular congestion .