Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . There is a right - sided Port - A - Cath which appears to terminate in the mid SVC , unchanged compared to the prior exam . The lung volumes are low . Increased linear opacities at the lung bases bilaterally are likely due to atelectasis . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Low lung volumes with linear opacities at the lung bases bilaterally likely due to atelectasis . No evidence of pneumothorax .