Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube , enteric tube , bilateral chest tubes , left - sided central venous line are all unchanged in position . Prosthetic cardiac valve is also visualized . There is a small left apical pneumothorax measuring 5 .6 mm . Diffuse pulmonary edema and left pleural effusion are slightly improved compared to the prior radiograph . Stable cardiomegaly . No interval change in bony thorax , sternal sutures remain unchanged .
    OUTPUT:
    
Small left apical pneumothorax measuring 5 .6 mm . Rest of the findings are unchanged compared to ___ except for mild improvement in pulmonary edema .