Multivisceral resection for primary pancreatic signet ring cell carcinoma.

Primary pancreatic signet ring cell carcinoma (PPSRCC) is a rare and aggressive tumor with poor prognosis. Here, we report a case of PPSRCC treated with curative surgery. A 49-year-old man presented with right mid-abdominal pain. Imaging tests showed a 3.6 cm tumor extending around the head of the pancreas, the second portion of the duodenum, and the retroperitoneum. Involvement of the right proximal ureter resulted in moderate right hydronephrosis. A subsequent tumor biopsy revealed suspected pancreatic adenocarcinoma. No apparent lymph node or remote metastases were observed. The tumor was considered resectable, and radical pancreaticoduodenectomy was planned. Pancreaticoduodenectomy, right nephroureterectomy, and right hemicolectomy were conducted to resect the tumor en bloc. Final pathology revealed a poorly differentiated ductal adenocarcinoma of the pancreas with signet ring cells infiltrating the right ureter and transverse mesocolon (pT3N0M0, stage IIA, according to UICC for International Cancer Control TNM classification). The postoperative course was uneventful, and oral fluoropyrimidine (S-1) was administered as adjuvant chemotherapy for 1 year. At the 16-month follow-up, the patient was alive without any evidence of recurrence. Pancreaticoduodenectomy with right hemicolectomy and right nephroureterectomy was performed for curative resection of PPSRCC infiltrating the transverse mesocolon and right ureter.