Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderately enlarged cardiac silhouette may have increased from the prior study of ___ , although this may be related to technical differences . The mediastinal contour is normal . There is no pulmonary vascular congestion , pulmonary edema , pneumothorax , or focal consolidation .
    OUTPUT:
    
1 . Interval increase in moderately enlarged cardiac silhouette compared with ___ may be due to differences in positioning . PA radiograph is necessary for direct comparison . Normal upper mediastinal contour . 2 . No focal consolidation , edema , or pneumothorax .