Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a single - lead pacemaker terminating in the right ventricle . The heart is moderately enlarged . The mediastinal and hilar contours appear unchanged . There is similar mild elevation of the right hemidiaphragm . There is no pleural effusion or pneumothorax . A very vague opacity in the right upper lobe is not as distinctly visualized .
    OUTPUT:
    
Decreased small focal opacity in the right upper lobe . Follow - up radiographs are recommended within eight weeks in order to show more complete evidence of resolution .