J o u r n a l P r e -p r o o f CAA was the cause of purulent pericarditis (CAA leak into the pericardial sac) or the result of the purulent pericarditis (local injury of the CAA due to the artery's wall inflammation). However, the most plausible series of events is that CAA preceded pericarditis and when the CAA had reached a critical size, a possible tearing of the wall was the cause of leak into the pericardium. J o u r n a l P r e -p r o o f