Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest obtained with patient in semi-upright position is analyzed in direct comparison with the next preceding similar study obtained six hours earlier during the same day . Tracheostomy cannula remains in unchanged position . The same holds for multiple other devices and unchanged position is noted of the CoreValve typical grid structures in the left ventricular outflow tract - aortic valve area . Cardiac contours , sternotomy wire , and anterior chest wall stabilization device are unchanged . Left - sided pleural effusion obliterating diaphragmatic contour is unchanged . The degree of pulmonary vascular congestion is as before . No significant remaining pneumothorax can be identified on either side .
    OUTPUT:
    
Stable chest findings during latest examination interval .