Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a left chest port with the tip in the low SVC . The cardiomediastinal silhouette is normal . The lungs are clear and demonstrate low volumes which are improved from prior radiograph . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left chest port with the tip in the low SVC . No etiology for lack of drawback is identified .