Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle nodular opacities in the right upper lobe are better seen on the subsequent CT . No large air space consolidation . The hilar and cardiomediastinal contours are normal with the exception of chronic mild cardiomegaly . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . The patient is status post median sternotomy and mitral valve replacement .
    OUTPUT:
    
Subtle nodular opacities in the right upper lobe are better seen on the subsequent CT .