Spontaneous fistulization of walled-off pancreatic necrosis into the colon.

Spontaneous fistulization of the pancreatic necrosis into the colon is rare. It should be kept as differentials in the presence of massive air in the WOPN. Sometimes, simple bedside X-ray abdomen may clinch the diagnosis in the presence of large radiolucent air-fluid level with a peripheral displaced bowel loops.