Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Nodular opacity described on thoracic spine radiograph of ___ is not evident on this dedicated chest radiograph , and could have been due to summation of structures related to low lung volumes on that exam . Cardiomediastinal contours are normal . Lungs and pleural surfaces are clear appear
    OUTPUT:
    
No evidence of lung nodule