Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . Superimposed on pre-existing heterogeneous interstitial abnormalities are areas of increased and new opacification . Areas where opacification has increased include the right upper lobe , the medial right lung base . However left perihilar opacification has decreased . There is slight increase in density of opacity projecting over the left lateral chest wall which suggests atelectasis and perhaps loculated pleural fluid . At this site there is a more clearly visible but probably subacute fracture with lysis . The lysis is possibly due to healing , although not ineffective healing ; it is less likely but not possible to exclude pathological fracture .
    OUTPUT:
    
Overall worsening of multifocal heterogeneous opacities concerning for worsening of chronic infectious process although etiology is indeterminant . Lytic change and non-displaced fracture along the left posterior lateral sixth although probably subacute or older ; appearance may reflect ineffective healing response . Because a pathological fracture is not excluded , it may be appropriate to reassess with follow - up radiographs .