Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is stable compared to multiple prior exams dating back at least to ___ . The previously noted subtle opacity in the right lung base is not seen on this exam . There are no new focal consolidations , pleural effusions or pneumothorax . The hilar and mediastinal contours are unremarkable .
    OUTPUT:
    
No evidence of pneumonia .