Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior studies , there has been increased diffuse lung opacification most pronounced in the right upper lobe and left lower lobe . Left chest wall mass causing bony destruction , better seen on recent PET - CT . Mediastinal contour is normal . Cardiac contour is ill - defined secondary to lung opacity . There is no pneumothorax .
    OUTPUT:
    
Interval increase in diffuse airspace opacity most pronounced in the right upper lobe and left lower lobe , concerning for multifocal infection . Of note , drug toxicity from chemotherapy can have a similar appearance . Known left chest wall mass better evaluated on recent PET - CT .