Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi upright view of the chest . Multiple overlying leads limit the assessment . The lungs are grossly clear . A retrocardiac opacity containing gas may represent a hiatal hernia . No overt signs of pneumonia . Small right pleural effusion again noted . Subtle opacity in the right mid lung at the site of multiple rib fractures likely represents chronic pleural thickening versus loculated pleural effusion . No convincing evidence for pulmonary edema . No pneumothorax . Cardiomediastinal silhouette appears unchanged . No significant change from prior .
    OUTPUT:
    
No significant change from prior .