Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post median sternotomy and CABG . The cardiac and mediastinal silhouettes are stable and unremarkable . There is no widening of mediastinum . There is subtle ground - glass opacification in the right lung base , new / increased since the prior study , which could be due to atelectasis or mucoid impaction , although underlying early consolidation is not excluded . The left lung is clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle right base opacity , could be due to atelectasis , vascular structures , or mucoid impaction , although underlying consolidation is not excluded in the appropriate clinical setting .