Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right - sided drainage tube has been removed . There is no pneumothorax or pleural effusion . There is stable mild - to - moderate cardiomegaly . New increased opacification of the left lung base is likely atelectasis due to low lung volumes or possibly early pneumonia in the proper clinical setting . There is no focal consolidation or pulmonary edema .
    OUTPUT:
    
1 . No pneumothorax or pleural effusion after removal of chest tube . 2 . Left base opacity is likely atelectasis , but early pneumonia can not be fully excluded .