Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph demonstrates low lung volumes , with minimal infrahilar atelectasis . There is no focal consolidation . The pulmonary vasculature is engorged , and there is mild interstitial abnormality . The cardiac silhouette is top normal in size . The mediastinal contours are normal . A drainage catheter is noted in the right upper quadrant , with adjacent cholecystectomy clips .
    OUTPUT:
    
Low lung volumes with mild pulmonary interstitial abnormality , which could represent edema or chronic thickening . Comparison with prior radiographs is recommended to aid in this differentiation .