Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Moderate cardiomegaly is unchanged . There has been no significant interval change in bilateral interstitial and airspace opacities . There is no pneumothorax . Right shoulder degenerative changes have progressed since ___ .
    OUTPUT:
    
Unchanged bilateral interstitial and airspace opacities which may be due to edema versus infection . Stable moderate cardiomegaly .