Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . Compared to the preoperative study on ___ , the postoperative widening of the mediastinum has progressed , particularly a bulging mediastinal contour over the main pulmonary artery and descending thoracic aorta . This is concerning for possible post-operative fluid collection , such as hematoma , or pseudoaneurysm . Degree of pulmonary edema is unchanged . Calcified right hilar lymph node is again seen . Swan - Ganz catheter and endotracheal tube have been removed . Right IJ sheath terminates in mid SVC . Bilateral pleural drains and mediastinal drains are in appropriate positions . Nasogastric tube terminates in the stomach .
    OUTPUT:
    
Findings concerning for new possible mediastinal fluid collection ( hematoma ) or pseudoaneurysm , new since 2 days ago .