Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild to moderate cardiomegaly , with a unfolding of the aorta . There is mild vascular plethora , consistent with mild CHF . Faint increased opacity at the left lung base could reflect presence of left lower lobe collapse and / or consolidation . The appearance is similar to ___ , although slightly improved . Linear atelectasis at the left base is also noted . There is minimal subsegmental atelectasis the right base . No gross effusion seen on either side , though the costophrenic angles are not sharply defined .
    OUTPUT:
    
Probable mild CHF . A faint opacity at the left lung base , consistent with collapse and / or consolidation . Changes due to aspiration could have a similar appearance . If clinically indicated , a lateral view may help for further assessment .