Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperexpanded . Coarse reticular interstitial markings , predominating the bases , are consistent with fibrosis , as seen on the prior CT abdomen and pelvis of ___ . There is increasing opacity lung base from ___ which , in the appropriate clinical setting could represent pneumonia . No pleural effusion or pneumothorax . Mediastinal and hilar structures are unremarkable . Course of the trachea is unchanged .
    OUTPUT:
    
Increasing retrocardiac opacity from ___ , which in the appropriate clinical setting could represent pneumonia .