Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and coronary artery bypass grafting . Marked cardiomegaly is unchanged . There is mild pulmonary vascular engorgement without frank edema . There is no pleural effusion identified . Lung volumes are low . Bibasilar opacities likely represent atelectasis . Within the right upper lung is a rounded nodule measuring approximately 1 .2 cm . There is no pneumothorax .
    OUTPUT:
    
1 .2 cm nodular opacity in the right upper lung should be further evaluated with CT to exclude the possibility of a small focus of lung cancer .