Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lordotic positioning . Compared with the prior film , the interstitial markings have improved , suggesting that this may have reflected interstitial edema or less likely an interstitial infiltrate . At present , no increased interstitial markings or CHF is identified . Increased retrocardiac density , consistent with left lower lobe collapse and / or consolidation , similar to prior , possibly minimally improved . Minimal blunting of the right costophrenic angle , but no gross effusion .
    OUTPUT:
    
Interval improvement increased interstitial markings . No current evidence of CHF . Persistent left lower lobe collapse and / or consolidation .