Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity in the left upper lobe and lingula could represent an infectious process in the proper clinical setting with lesser consideration to asymmetric pulmonary edema . There is no pleural effusion , pneumothorax , or frank pulmonary edema . The cardiomediastinal silhouette is stably enlarged . A left pectoral single lead pacemaker projects in unchanged position .
    OUTPUT:
    
Left upper lobe and lingular opacities are worrisome for pneumonia .