Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there has been interval progression of disease . There is a approximately 12 cm AP by 12 cm CC rounded density within the right lower lobe . There is also likely some superimposed component of atelectasis given subtle right - sided volume loss . On prior exam from ___ there had been a 2 .5 cm nodule in this region in addition to a sub - carinal density which on the current exam can not be differentiated . On today 's exam , there is also a new right apical pulmonary nodule projecting over the posterior right fourth rib . Cardiac silhouette is enlarged but stable . Atherosclerotic calcifications noted at the aortic arch .
    OUTPUT:
    
Significant interval enlargement of previously known masses since ___ . Probable superimposed component of postobstructive atelectasis . New right apical pulmonary nodule .