Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improved lung volumes . Decreased basilar atelectasis . Persistent vague opacity in the left lower lung zone . Right - sided IJV CVP in situ with the tip in the distal SVC . Evidence of previous cervical spinal fusion .
    OUTPUT:
    
Improved lung volumes . Vague opacity in the left lower lung zone is nonspecific and short - term follow - up radiograph advised