Rationale: We describe a case of insulinoma located extremely close to the accessory pancreatic duct (APD), but away from the main pancreatic duct (MPD). Previous studies showed insulinoma enucleation is a safe procedure for small benign tumors >3 mm distant from the MPD. However, in this case enucleation of the tumor led to unanticipated APD injury and grade B post-operative pancreatic fistula (POPF). We provide detailed records of clinical management and argue that enucleation of tumors near APD needs to be carefully weighed.
Patient concerns: The patient experienced a sudden increase of abdominal drain fluid and prolonged drainage time after a regular insulinoma enucleation surgery.
Diagnosis: APD damage during the enucleation.
Interventions: Drain fluid amylase concentration were regularly recorded and prolonged somatostatin analogs were administered.
Outcomes: Amount of abdominal drain gradually decreased and the drain tube was removed on postoperative 37.
Lessons: Benign pancreatic tumor close to the APD need to be evaluated carefully and clinical evidence is warranted to affirm the necessity of placing a pancreatic duct stent before the surgery.
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