Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation is seen . Retrocardiac opacity with air - fluid level is consistent with the large hiatal hernia . There is slight blunting of the bilateral posterior costophrenic angles may be due to pleural thickening versus very trace pleural effusions . No pneumothorax is seen . Cardiac silhouette is top - normal . Mediastinal contours are stable . No pulmonary edema is seen . Partially imaged is a right humeral prosthesis .
    OUTPUT:
    
Slight blunting of the bilateral posterior costophrenic angles may be due to pleural thickening or very trace pleural effusions . No focal consolidation to suggest pneumonia . Hiatal hernia .