Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided tunneled subclavian line with the tip in the right atrium . No pneumothorax . Left upper lobe collapse has slightly improved . There is persistent retrocardiac and basal opacity with mediastinal shift in keeping with volume loss . Endotracheal tube is 4 cm of the carina and the nasogastric tube is in good position .
    OUTPUT:
    
Right - sided tunneled subclavian line with the tip in the right atrium . Slight interval improvement in extent of left lung atelectasis , particularly in the left upper lobe .