Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is marked cardiomegaly , probably not significantly changed . Also again seen is upper zone redistribution and mild vascular plethora , which may be slightly worse . There has been interval improvement in the degree of opacification at the left lung base . There is residual left base atelectasis and a residual small left effusion . Hazy opacity at the right base , slightly increased , may reflect CHF and increased atelectasis . No frank consolidation or gross effusion seen at the right lung base .
    OUTPUT:
    
Probable slight increase in CHF . Partial interval improvement of left lung base collapse / consolidation and effusion . Residual atelectasis and small residual amount of left pleural fluid remain present . No frank consolidation or gross effusion at right base , though atelectasis and vascular engorgement have probably increased .