Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly lower lung volumes , unchanged since at least ___ . The lungs are otherwise clear , without focal consolidation or pulmonary edema . No pleural effusion or pneumothorax . Stable mild cardiomegaly . Stable mediastinal contours and hila .
    OUTPUT:
    
1 . No pneumonia . 2 . Mild cardiomegaly , stable since at least ___ .