[Infectious pancreatic pseudocyst-portal vein fistula treated with percutaneous drainage through the portal vein].

A 63-year-old man developed an infectious pancreatic pseudocyst after acute-on-chronic pancreatitis. The CT and MRI showed the pancreatic pseudocyst communicating with the left branch of the portal vein which now contained cystic fluid. The condition was diagnosed as a pancreatic pseudocyst-portal vein fistula. Because there was no appropriate route through which to drain the pseudocyst, the procedure was performed via the portal vein. The patient's symptoms rapidly improved after the procedure and no recurrence has been observed for three years. Here, we report a rare case of pancreatic pseudocyst-portal vein fistula treated by drainage via the portal vein.