Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . Left base opacity is seen , which could be due to a combination of pleural effusion and atelectasis , although underlying consolidation can not be excluded . The right lung is clear , although a trace pleural effusion would be difficult to exclude . The patient is status post median sternotomy and aortic valve replacement . Cardiac silhouette is top normal to mildly enlarged . Mediastinal contours are stable . The aorta is calcified . Degenerative changes are seen at the acromioclavicular , shoulder joints , and along the spine . Small 3 - mm calcification projecting over the soft tissue along the lateral left humeral head may relate to calcific tendinosis .
    OUTPUT:
    
Left base opacity likely represents combination of pleural effusion and atelectasis , although underlying consolidation can not be excluded . Minimal pulmonary vascular congestion .