Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly has been stable compared to exams dated back to ___ . The aorta is tortuous , and low lung volumes exaggerate the cardiomediastinal contours , which are otherwise unremarkable . There is mild pulmonary vascular congestion . Compared to the lateral radiograph from ___ , there appears to be an interval increase in consolidation in the retrocardiac region . Mild bibasilar atelectasis is persistent . There is no evidence of a pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Compared to the lateral radiograph from ___ , there has been an interval increase in consolidation in the retrocardiac region , which is concerning for pneumonia .