Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette appears larger than on the prior study despite comparable lung volumes . Mediastinal and hilar contours are unremarkable . There is no evidence for pulmonary edema , pulmonary consolidation , or pleural effusion . Instrumented posterior fusion of the lower thoracic and upper lumbar spine is again partially visualized . Ossification of the anterior longitudinal ligament is noted in the thoracic spine .
    OUTPUT:
    
1 . No evidence for pneumonia or pulmonary edema . 2 . The cardiac silhouette appears larger than in ___ .