Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior chest radiograph of ___ . The lung volumes have slightly improved ; however , they remain very low . Bilateral diffuse increased interstitial opacity consistent with the chest CT findings of interstitial lung disease . There is mild vascular congestion . No pleural effusion or pneumothorax identified . There is mild cardiomegaly . Median sternotomy wires are intact .
    OUTPUT:
    
Mild pulmonary vascular congestion in a background of chronic interstitial lung disease .