Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer is again noted with single lead terminating in the region of the right ventricle . Mild enlargement of cardiac silhouette is again noted with dense mitral annular calcifications . Mediastinal and hilar contours are unchanged with atherosclerotic calcifications appearing most pronounced at the aortic knob . No pulmonary edema is present . Increased streaky opacities in the lung bases are noted , potentially worsening atelectasis though infection , particularly in the left lung base is not completely excluded . There is no pneumothorax . Elevation of the right hemidiaphragm is again noted .
    OUTPUT:
    
Streaky opacities in the lung bases may reflect worsening atelectasis though infection in the left lung base is not completely excluded .