Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph on ___ , the right IJ catheter has been removed . Median sternotomy wires are intact . Bronchovascular markings are accentuated by low lung volumes . Pulmonary vascular congestion is mild . A small left pleural effusion is similar , or perhaps smaller compared to ___ . There is no focal consolidation or pneumothorax . Heart size is mildly enlarged , and postoperative appearance of the cardiomediastinal silhouette is unchanged . There is a prosthetic aortic valve . No acute osseous abnormalities are identified .
    OUTPUT:
    
1 . Stable or improved small left pleural effusion compared to ___ . 2 . Stable postoperative appearance of the cardiomediastinal silhouette , with mild pulmonary vascular congestion .