Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is spinal hardware . There is a retrocardiac opacity consistent with volume loss in at the left lower lung . The lungs are otherwise clear . The cardiomediastinum is left shifted as compared to prior , but this could be due to obliquity .
    OUTPUT:
    
Retrocardiac opacity with associated volume loss at the left lower lung , but this may be due to the change in obliquity of the patient .