Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is enlarged but stable in size . Large hiatal hernia is again demonstrated . No focal areas of consolidation are present within the lungs , and there are no pleural effusions . Widening of left superior mediastinum is in part secondary to known left lobe thyroid enlargement as demonstrated on prior CT of ___ . More diffuse mediastinal widening corresponds to mediastinal lipomatosis on the prior CT .
    OUTPUT:
    
1 . Mild cardiomegaly without evidence of congestive heart failure . 2 . Large hiatal hernia .