Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The lungs are clear of confluent consolidation or effusion . There is a well defined density in the at the posterior aspect of the mediastinum on the right . This was present on prior however appears slightly larger on the current exam . This is not clearly identified on the lateral and there is no visualized air-fluid level to confirm hiatal hernia . No acute osseous abnormalities detected . Cardiomediastinal silhouette is otherwise unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process . Interval enlargement and of the density at the posterior aspect of the mediastinum on the right . This is not definitively a hiatal hernia . It demonstrates intervcal enlargement since ___ . Consider nonurgent chest CT in to further characterize .