Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding available PA and lateral chest examination ___ ___ . Status post sternotomy as before . Presence of multiple small surgical mediastinal clips is indicative of previous bypass surgery . Some of the clips are high positioned , indicating a LIMA anastomosis to be included . The heart size remains within normal limits , and there is no evidence of left atrial enlargement or significant pulmonary congestion . There is no significant interval change , and no evidence of new acute pulmonary abnormalities is present on today 's examination . On the preceding examination , abnormalities were suspected which led to the performance of a chest CT on ___ . Postoperative mediastinal abnormalities were identified , but no acute new pulmonary or vascular abnormality was found .
    OUTPUT:
    
Stable chest findings . No evidence of acute infiltrates . Right lower lobe abnormality found in other hospital could not be substantiated .