Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided central venous catheter is in unchanged position , terminating at the mid SVC . There is persistent opacification of the right lung base , likely secondary to moderate sized pleural effusion . Blunting of the left costophrenic angle is likely secondary to a small pleural effusion . Widening of the upper mediastinum correlates with lymphadenopathy and soft tissue density within the mediastinum as seen on prior CT . No definite pneumothorax seen on this portable semi-erect chest radiograph . Pulmonary edema has slightly improved , now mild .
    OUTPUT:
    
No significant pneumothorax seen on this portable semi-erect chest radiograph .