A 66-year-old female with upper abdominal pain was diagnosed the pancreatic tail cancer infiltrating into the stomach and transverse colon by computed tomography(CT). Umbilical metastasis(so called Sister Mary Joseph's nodule)and peritoneal metastases in pouch of Douglas were detected by FDG-PET. The patient was diagnosed as unresectable pancreatic cancer with distant metastases. Thus, she received FOLFIRINOX therapy. After 9 courses of FOLFIRINOX therapy and 15 courses of FOLFIRI therapy, the pancreatic tumor shrunk on CT. In addition, umbilical metastasis and peritoneal metastases disappeared on FDG-PET. Therefore, conversion surgery was scheduled. Fourteen months after the initial treatment, we performed distal pancreatectomy with left adrenalectomy partial gastrectomy, transverse colectomy, and umbilical resection. The patient was discharged 15 days after the operation without serious complications. Histopathological findings revealed the presence of adenocarcinoma infiltrating into the preperitoneal adipose tissue in the umbilicus. Histological therapeutic effect was Grade Ⅰb according to the 7th Edition of the General Rules for the Study of Pancreatic Cancer. Seven months after the operation, local recurrence was showed. The patient is still alive 2 years and 5 months since the initial treatment.