Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient 's clinical condition required examination in sitting position using AP frontal and left lateral views . Analysis is performed in direct comparison with the next preceding portable AP chest examination with the patient in supine position performed on ___ . There is status post sternotomy and evidence of previous bypass surgery with moderate cardiac enlargement remaining . The on previous portable examination identified cephalization in the pulmonary vasculature has normalized as the patient now is in upright position . There is no evidence of advanced pulmonary vascular congestion as the lateral and posterior pleural sinuses are free . No evidence of acute infiltrates and no pneumothorax in the apical area . The examination was performed today at noontime of ___ . It is unclear why the examination was requested to be performed one day later on ___ .
    OUTPUT:
    
Stable moderate cardiac enlargement , status post bypass surgery without evidence of acute pulmonary congestion and no evidence of acute pulmonary infiltrates .