Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One portable AP upright view of the chest . In the retrocardiac area , there is a vague opacity that may represent aspiration or pneumonia . There is no pleural effusion or pneumothorax . The cardiomediastinal contours are normal .
    OUTPUT:
    
Vague retrocardiac opacity may represent aspiration or pneumonia in the correct clinical setting . For better visualization , PA and lateral views can be done .