Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Lung volumes are markedly low limiting assessment . There is a retrocardiac opacity containing an air - fluid level compatible with a large hiatal hernia . There is subtle left lower lung hazy opacity which is potentially concerning for pneumonia or aspiration . The right lung appears relatively clear . No large effusion or pneumothorax is seen . Heart size is difficult to assess . Mediastinal contour appears prominent likely due to technique . No acute bony abnormality seen .
    OUTPUT:
    
Large hiatal hernia , left mid to lower lung hazy opacity concerning for pneumonia or aspiration .