Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . There is redemonstration of a right PICC , ending near the superior cavoatrial junction . Lung volumes remain low . Diffuse lung opacification has improved since ___ . There is no new consolidation and no pleural effusion . No pneumothorax is seen . Elevation of the right hemidiaphragm is not significantly changed . Spinal fusion hardware is redemonstrated .
    OUTPUT:
    
No evidence of pneumonia . Previous pneumonia and chronic edema improved since ___ .