Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The indwelling left subclavian lead ends in the right ventricle as before , and the new lead travels along the chest wall through the right subclavian vein and ends outside the left ventricle . Previous left pleural effusion has decreased to baseline , and the left mediastinal shift has resolved , but the left lower lobe collapse that followed the new lead placement has not fully resolved . Moderate cardiomegaly is unchanged without pulmonary edema .
    OUTPUT:
    
Left lower atelelctasis improved . Tunneled transvenous left ventricular pacer lead follows right subclavian approach .