Perihilar cholangiocarcinoma (PHC) is one of the gastrointestinal cancers with a poor prognosis.
1 Surgical resection is the only curative treatment, but PHC often is advanced at the time of diagnosis and often not suitable for resection. Peritoneal lavage cytology (CY) has been reported as a poor prognostic factor in gastric and pancreatic cancer, including peritoneal dissemination recurrence and poor survival. However, there are very few reports on the clinical significance of CY positivity in PHC.
2‐4 Therefore, the significance of primary tumor resection in CY-positive patients has remained unclear. …