Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right PICC line ends at the upper SVC , previously at the superior cavoatrial junction . Overall , the residual effusion and thickening in the left lower lobe has decreased . No right pleural effusion or residual left pleural air . The right lung and left upper lung are clear .
    OUTPUT:
    
1 . Overall improvement in the residual left lower lobe effusion thickening . 2 . Retraction of the right PICC line to the upper SVC .