Spontaneous fistulisation of infected walled-off necrosis (WON) into the duodenum in a patient following acute necrotising pancreatitis.

Infected walled-off necrosis (WON), previously referred to by various terminologies including pancreatic abscess, is one of the well-known local complications of acute necrotising pancreatitis. Very rarely they can spontaneously rupture or fistulise into adjacent structures, leading to either further complications or resolution. More often these events lead to complications rather than resolution of the condition. We report a case of an infected WON following an episode of acute necrotising pancreatitis with spontaneous fistulisation into the duodenum resulting in a complete resolution of the symptoms.