Solid pseudopapillary neoplasm of the pancreas after living-donor liver transplantation

Background: Solid pseudopapillary neoplasm of the pancreas has been classified by the World Health Organization as a low-grade malignant tumor with potential to metastasize. The standard treatment for this neoplasm is complete surgical resection. However, it is not always feasible to perform a complex procedure such as pancreaticoduodenectomy or distal pancreatectomy, espe-cially for patients with a history of hepato-biliary-pancreatic surgery. In such cases, the treat-ment strategy must consider the patient's postoperative quality of life. We herein report a case of solid pseudopapillary neoplasm of the pancreas following living-donor liver transplantation.Case presentation: The patient was a 13-year-old girl who had undergone the Kasai procedure for biliary atresia at 140 days of age. She thereafter underwent living-donor liver transplanta-tion because of recurrent cholangitis and progressive jaundice. Her repeated history of cholan-gitis had caused narrowing of the portal vein. Therefore, the portal vein was reconstructed us -ing the donor's ovarian vein as an interposition graft. At 13 years of age, a mass was identified at the head of the pancreas. Biopsy was performed and the patient was diagnosed with solid pseudopapillary neoplasm of the pancreas. Surgical resection was planned, and three options were considered: pancreaticoduodenectomy, duodenum-preserving pancreatic head resection, and enucleation. Considering the complications associated with radical surgery, tumor enucle-ation was performed. The patient developed a postoperative pancreatic fistula that required prolonged fasting and drainage. She began a low-fat diet on postoperative day 15. Because the pancreatic fistula was well controlled with a low-fat diet, the patient was discharged on postop-erative day 51 after she and her parents had received dietary guidance. At the time of this writ-ing, 1 year had passed since the enucleation with no evidence of recurrence.Conclusions: We have herein reported a case of solid pseudopapillary neoplasm of the pancreas after living-donor liver transplantation. Although a radical operation such as pancreaticoduo- denectomy or distal pancreatectomy is preferable from an oncological perspective, enucleation should be considered for patients with high surgical risk.