Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , the cardiomediastinal silhouette is grossly unchanged . Sternotomy wires again noted . Heart size is at the upper limits of normal , with a mild left ventricular configuration . The aorta is calcified . No CHF , though mild thickening of the minor fissure is again noted . No pneumothorax or effusion . There is patchy opacity in the right infrahilar region which is probably similar to ___ . Otherwise , no focal infiltrate detected . No rib fracture identified on these lung technique films . Note made of degenerative changes at the left greater the right acromioclavicular joints .
    OUTPUT:
    
Patchy opacity in the right infrahilar region is similar to ___ and therefore likely represents an area of scarring . The differential diagnosis could include an area of atelectasis or infiltrate , but this is considered much less likely given stability over time . No other infiltrate identified . No CHF , effusion , or pneumothorax detected .