Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and mitral valve replacement . Pacemaker / ICD remains in place with leads in the right atrium and right ventricle . Heart is enlarged but stable in size . There is no evidence of pulmonary edema . Persistent small right pleural effusion , slightly decreased in size since ___ with adjacent area of improving atelectasis . Poorly defined opacity in the right mid lung region is also improving . Linear areas of atelectasis in the left lung base have slightly worsened .
    OUTPUT:
    
1 . Cardiomegaly without congestive heart failure . 2 . Slight improvement in small right pleural effusion . 3 . Multifocal atelectasis in the right mid and both lower lung regions .