Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior studies , the left lung demonstrates longstanding diffuse homogeneous opacities characterized as ground glass infiltrations on prior chest CT which appear stable and unchanged . Somewhat heterogeneous opacities on the right have evolved , with increased consolidations in the lateral aspect of the right lung . This process seems to fluctuate on day - to - day basis , based on concurrent cardiac function . These findings may be related to pneumonitis , less likely an infection , and raises the possibility of a drug reaction and / or toxic exposure .
    OUTPUT:
    
Stable diffuse homogeneous opacities in the left lung with heterogeneous right lung opacities and increased right peripheral consolidations which raise the possibility of pneumonitis as a result of a drug reaction and / or toxic exposure initiated in late ___ .