Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resulting bronchovascular crowding . The right lung is clear . Stable - appearing small left - sided pleural effusion with adjacent atelectasis . Small amount of subcutaneous emphysema along the left chest wall . Persistent moderate cardiomegaly . Three chest tubes project over the left hemithorax .
    OUTPUT:
    
Persistent small left - sided pleural effusion with adjacent atelectasis .