Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities within the left mid lung are similar to prior and likely reflect scarring . Lung volumes are low , however , no confluent consolidation is identified . There is no pulmonary edema or large pleural effusions . Moderate enlargement of the cardiomediastinal silhouette appears similar to prior examination and is consistent with recent CABG . Enlargement of the thoracic aorta is similar to multiple priors . Median sternotomy wires are intact . There is no pneumothorax . Again noted is a prosthetic aortic valve in unchanged position . Deviation of the trachea to the right is unchanged from prior and consistent with known thyroid enlargement seen on prior CT .
    OUTPUT:
    
Postoperative widening of the cardiomediastinal silhouette , unchanged from prior . No acute cardiopulmonary process .