Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Heart size is moderately enlarged , unchanged . The aorta is tortuous . The mediastinal contours are otherwise similar . Enlargement of the right hilum is unchanged , compatible with mild enlargement of the right pulmonary artery . Pulmonary vasculature is not engorged . Patchy right basilar opacity is concerning for an area of infection with a small right pleural effusion . No pneumothorax is present . Severe degenerative changes are noted within the thoracic spine .
    OUTPUT:
    
Patchy right basilar opacity concerning for pneumonia . Small right pleural effusion . Moderate cardiomegaly without pulmonary edema .