Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A new left thoracostomy tube is present , resulting and improved aeration of the left lung and decreased left effusion . The right lung remains clear . There is no pneumothorax . Multiple intact sternal wires , prosthetic valve , and a left pacemaker generator pack projecting leads into the right ventricle and atrium remain unchanged . A right IJ catheter terminates at the cavoatrial junction .
    OUTPUT:
    
New left thoracostomy tube , with interval decrease of a left pleural effusion and improved aeration of the left lung . No pneumothorax .