Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Left chest wall pacer device is seen with leads extending to the right atrium and right ventricle unchanged . Small bilateral pleural effusions are noted with scarring in the left lower lobe which appears chronic . Central hilar congestion with mild interstitial edema is noted . No pneumothorax . Cardiomediastinal silhouette is stable . Scoliotic curvature of the thoracic spine again noted .
    OUTPUT:
    
Mild pulmonary interstitial edema with small bilateral pleural effusions and chronic scarring in the left lower lobe . Difficult to exclude a superimposed pneumonia in the left lung base .