Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low with vascular crowding but no frank pulmonary edema . There is mild bronchial wall thickening . There is no definite focal airspace opacity to suggest pneumonia . Mild cardiomegaly is unchanged . The mediastinal and hilar contours are normal .
    OUTPUT:
    
1 . Mild bronchial wall thickening without definite focal airspace opacity could reflect bronchitis . There is no convincing evidence of pneumonia . 2 . Mild cardiomegaly is unchanged .