Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a small left pleural effusion , new from prior . Mildly elevated right hemidiaphragm is unchanged . No focal consolidation concerning for pneumonia . There is a retrocardiac opacity which is compatible with known moderate hiatal hernia . No signs of pneumonia . No pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Small left pleural effusion , moderate hiatal hernia .