Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A left subclavian central venous catheter terminates at the cavoatrial junction . A nasogastric tube terminates within the stomach . There is no pneumothorax , focal consolidation , or right pleural effusion . A trace left pleural effusion is present .
    OUTPUT:
    
Small left pleural effusion . No superimposed acute intrathoracic process .