Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased retrocardiac density as compared to prior . Additionally , a broad curvilinear lucency is visualized in this region . Findings may be due to a small hiatal hernia and less likely a necrotic pneumonia . Recommend follow - up PA and lateral chest radiographs for further assessment . The remainder of the lungs appear clear . There is no pulmonary edema or pleural effusion . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits and unchanged .
    OUTPUT:
    
Increasing retrocardiac opacity with adjacent lucency , most likely a hiatal hernia . Follow - up PA and lateral chest radiographs is recommended .