Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An 8 mm round density is present in the left perihilar region , most likely a vessel , but a small pulmonary nodule can not be excluded . The lungs are otherwise clear without consolidations or edema . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . Small left perihilar density is present and most likely represents a vessel , although a small pulmonary nodule can not be excluded . Finding will be further evaluated on pending chest CTA . 2 . No evidence of pneumonia or pulmonary edema .