Satoshi Okubo

A Resected Case of Intraductal Tubulopapillary Neoplasm of the Pancreas: Report of a Case

The patient was a 61-year-old male who was referred to our hospital after dilatation of the main pancreatic duct was detected by screening ultrasonography. Computed tomography revealed a protruding lesion measuring 15 mm in diameter within the main pancreatic duct in the head of the pancreas, and magnetic resonance cholangiopancreatography revealed interruption of the duct at the tumor site. We performed pancreaticoduodenectomy under a suspected diagnosis of invasive ductal carcinoma. Gross examination of the resected specimen showed that the tumor invaginated into the main pancreatic duct, and no mucin was found. Histological examination revealed proliferation of high-grade dysplastic cells in a tubulopapillary growth pattern. Immunohistochemically, cytokeratin 7 expression was detected, but not trypsin expression. Based on these morphological features, we diagnosed the tumor as intraductal tubulopapillary neoplasm (ITPN). We report the case with bibliographic consideration, together with a review of intraductal neoplasms of the pancreas encountered at our institution.

Abdominal skin closure using subcuticular sutures prevents incisional surgical site infection in hepatopancreatobiliary surgery

Background: Hepatopancreatobiliary surgery has a high incidence of postoperative morbidity, including incisional surgical site infection. Although several studies showed that subcuticular sutures reduced incisional surgical site infection in other fields of surgery, their impact on hepatopancreatobiliary surgery remains unknown. The aim of this study was to assess whether subcuticular sutures could reduce incisional surgical site infection in patients undergoing hepatopancreatobiliary surgery. Methods: A total of 436 consecutive patients underwent laparotomy and surgical resection for hepatopancreatobiliary tumors in our department from May 2013 to December 2015. We excluded among them, 8 patients with a follow‐up period <30 days and 1 patient with unclear operative information. The incidence of incisional surgical site infection was compared between use of subcuticular sutures and of stapling, using propensity score analyses. Results: In the baseline cohort (n=427), abdominal skin closure was performed by subcuticular sutures in 245 patients (57.4%) and by stapling in 182 patients (42.6%). The incidence of incisional surgical site infection was 5/245 (2.0%) in the subcuticular suture group and 21/182 (11.5%) in the stapling group (P <. 01). In the propensity score–matched cohort (n=318), patient demographics were well balanced between the two groups, and the incidence of incisional surgical site infection was 3/159 (1.8%) in the subcuticular suture group and 16/159 (10.0%) in the stapling group (P < .01). Propensity score analyses, as well as simple regression analyses, showed subcuticular sutures could consistently reduce incisional surgical site infection (with odd ratios of about 0.20). Conclusion: Use of subcuticular sutures is preferred to stapling for the prevention of incisional surgical site infection in hepatopancreatobiliary surgery.

The prognostic impact of differentiation at the invasive front of biliary tract cancer

The invasive front of tumor can provide prognostic information in many cancers. We investigated the prognostic morphological factors at the invasive front including tumor differentiation (Difinv) and tumor budding (Bud) in biliary tract cancer (BTC).

The Evaluation of Internal Stent-Related Complications and Risk Factors of Stent Migration in Pancreaticoduodenectomy

Abstract Purpose: The placement of an internal stent through a pancreatic anastomosis is one of the surgical techniques to reduce the incidence of pancreatic fistula. However, the fate of the internal stent after placement remains unclear. The aim of this study was to evaluate stent-related complications and risk factors of stent migration through pancreaticojejunostomy in pancreaticoduodenectomy. Methods: We retrospectively analyzed 159 patients who underwent pancreaticoduodenectomy or subtotal stomach-preserving pancreaticoduodenectomy. Stent migration and stent defecation were confirmed by computed tomography. Risk factors of delayed detachment and migration of the stent were analyzed. Results: The median stent defecation time was 5.6 months and the stent was not expelled after 1 year in 33 patients (20.7%). Stent migration was detected in 11 patients (6.9%); the destination was always the hepatic duct. Stent-related complications were observed in 2 cases (1.3%). There were no significant risk factors ...