Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The right hemidiaphragm is substantially elevated . Colon interposed underneath the right hemidiaphragm indicates there is no subpleural subpulmonic effusion . The left lung is normal . The left cardiac contours are normal . There is no pneumothorax , effusion , or consolidation .
    OUTPUT:
    
Elevated right hemidiaphragm of unknown chronicity . Correlate with any prior imaging or history of phrenic nerve injury .