Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates well expanded and clear lungs . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . A new retrocardiac and right lower lobes opacity demonstrates in air - fluid level and is best assessed on lateral projection , consistent with a moderate - sized hiatal hernia . Limited assessment of the osseous structures are unremarkable and visualized upper abdomen is within normal limits .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Moderate hiatal hernia .