Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . Bronchial wall thickening in the lower lobes has not worsened , though the degree of bronchitis can not be fully assessed . There is no focal consolidation , effusion or pneumothorax . Mediastinal and hilar contours are stable . There is mild vascular engorgement with minimal interstitial pulmonary edema . Borderline mild cardiomegaly is unchanged . Old bilateral rib fractures with associated scarring in the left and right mid-zones .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Persistent bronchial wall thickening in the lower lobes has not worsened , though the degree of bronchitis can not be fully assessed . 3 . Mild vascular engorgement with minimal interstitial pulmonary edema . Borderline cardiomegaly is unchanged .