Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . The patient is status post median sternotomy and mitral valve replacement . The cardiac silhouette remains enlarged . Aortic knob is calcified . There is blunting of the left costophrenic angle again seen , consistent with pleural effusion . There is slight increase in markings in the right lung base , this may be artifactual , although underlying consolidation is not excluded .
    OUTPUT:
    
1 . Left pleural effusion again seen . 2 . Slight increased opacity in the right lung base may be artifactual , although an early consolidation is not excluded in the appropriate clinical setting .