Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single - lead left - sided pacemaker is again seen with lead extending to the expected position of the right ventricle . The cardiac silhouette remains moderately enlarged . The aortic knob is calcified . There is bibasilar atelectasis . Subtle prominence of the central vessels of the chest may be a component of mild central vascular engorgement , although this is similar to prior . Degenerative changes are seen along the spine .
    OUTPUT:
    
Basilar atelectasis with possible mild central pulmonary vascular engorgement . No significant interval change .