Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post MVR / AVR repair . Compared to chest radiograph performed earlier on the same day at 14 : 14 , the right IJ Swan ___ catheter has been pulled back and tip is in the proximal right main pulmonary artery . Other lines and tubes are in appropriate positions and are unchanged compared to previous . Apparent widening of the mediastinum likely due to oblique positioning of the patient and aortic knob margins remain sharp . Cardiac size is normal . The lungs are clear . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Apparent widening of the mediastinum likely due to oblique positioning of the patient rather than hemorrhage as aortic knob margins remain sharp . Right IJ Swan - Ganz catheter tip in proximal right main pulmonary artery .