Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior films , inspiratory volumes are slightly lower . There is probable vascular plethora , slightly more than on the prior film , though this is presumably accentuated by low lung volumes . There is left lower lobe collapse and / or consolidation as well as increased patchy opacity in the right cardiophrenic region . Possible small left effusion .
    OUTPUT:
    
1 . Low lung volumes , slightly worse compared with 611 . 2 . Increase in the appearance of vascular plethora , suggestive of CHF , though the appearance is likely accentuated by low lung volumes . 3 . Left lower lobe collapse and / or consolidation and patchy opacity at the right base likely also reflect atelectasis accentuated by low lung volumes , but the possibility of an infectious infiltrate would be difficult to exclude in this setting .