A case of chest wall recurrence of hilar cholangiocarcinoma 10 years after R1 surgery with positive ductal margin of carcinoma in situ.

Patients with cholangiocarcinoma sometimes show very slow progression and thereby exhibit long-term survival under treatment of the disease. A 72-year-old male with hilar cholangiocarcinoma underwent extended-right hemi-hepatectomy and caudate lobectomy. Pathological finding revealed a well differentiated tumor and carcinoma in situ at the bile duct margin. Routine imaging follow-up was continued for 5 years. Ten years after the surgery, the patient noticed a right-hand chest wall mass formation of 5 cm without any symptoms, and the tumor was diagnosed metastatic cholangiocarcinoma by needle biopsy. Radical resection of the metastatic tumor was performed. The pathological findings of the primary tumor and the metastatic tumor were similar. Three months later, recurrent multiple lesions were identified in the chest wall and the liver. The patient received chemotherapy. We here report a rare case of metastatic cholangiocarcinoma 10 years after hepatectomy with positive ductal margin of carcinoma in situ, implying that rare event of very late recurrence of patients with hilar cholangiocarcinoma should be taken into consideration. © The Japan Society of Clinical Oncology 2020.