Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior film , the opacity at the right lung base laterally has progressed slightly . Otherwise , I doubt significant interval change . Again seen is the NG tube extending beneath the diaphragm , off the film . Also again seen is a left IJ central line , tip over the right atrium , unchanged -- as before , consider retraction by approximately 4 cm to position at in the lower SVC . Suspect background COPD . There is cardiomegaly with upper zone redistribution and mild diffuse vascular blurring , consistent with CHF . No gross effusion . Densities overlying the lower thoracic spine are consistent with prior kypho - or vertebroplasty .
    OUTPUT:
    
Progression of opacity at the right base . The differential diagnosis includes aspiration or a pneumonic infiltrate . Otherwise , I doubt significant interval change .