Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: right - sided chest drain in situ . Interval decrease in size of the right - sided pleural effusion . No right - sided pneumothorax . The cardiomediastinal shadow is unchanged . Low lung volumes most likely a contribute to the increased bronchovascular markings seen in the lung bases . Spondylotic changes of the thoracic spine .
    OUTPUT:
    
Chest drain in the appropriate position . Interval decrease in size of the right - sided pleural effusion . No pneumothorax .