Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly has been stable compared to exams dated back to at least ___ . There appears to be an interval increase in consolidation at the left lower lung base compared to the prior exam from ___ . Note is made of mild pulmonary vascular congestion . Otherwise , the hilar and mediastinal contours are normal . There may be a small left pleural effusion . There is no evidence of a pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Interval increase in consolidation at the left lung base concerning for pneumonia compared to the prior exam from ___ .