Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable radiograph of the chest demonstrates the lungs are well expanded and clear . There is no evidence of focal consolidation , pneumothorax , or pleural effusion . The ascending shadow appears more prominent on this study compared to prior examination , possibly due to differences in imaging technique . There is air within the fundus of the stomach ; however , no subdiaphragmatic free air is identified .
    OUTPUT:
    
Apparent interval increased prominence of the aortic shadow since the prior study may be entirely projectional due to differences in imaging technique . However , follow - up routine PA and lateral radiographs are recommended for further characterization .