A structured program for teaching pancreatojejunostomy to surgical residents and fellows outside the operating room: a pilot study.

BACKGROUND: Pancreatojejunostomy (PJ) is one of the most difficult and challenging abdominal surgical procedures. There are no appropriate training systems available outside the operating room (OR). We developed a structured program for teaching PJ outside the OR. We describe its development and results of a pilot study. METHODS: We have created this structured program to help surgical residents and fellows acquire both didactic knowledge and technical skills to perform PJ. A manual was created to provide general knowledge about PJ and the specific PJ procedure used in our institution. Based on questionnaires completed by trainers and trainees, the procedure for PJ was divided into twelve steps and described in detail. After creating the manual, we developed organ models, needles and a frame box for simulation training. Three residents (PGY3-5) and three fellows (PGY6 or above) participated in a pilot study. Objective and subjective evaluations were performed. RESULTS: Trainees learn about PJ by reading the procedure manual, acquiring both general and specific knowledge. We conducted simulation training outside the OR using the training materials created for this system. They simulate the procedure with surgical instruments as both primary and assistant surgeon. In this pilot study, as objective assessments, the fellow-group took less time to complete one anastomosis (36 min vs 48 min) and had higher scores in the objective structured assessment of technical skill (average score: 4.1 vs 2.0) compared to the resident-group. As a subjective assessment, the confidence to perform a PJ anastomosis increased after simulation training (from 1.6 to 2.6). Participants considered that this structured teaching program is useful. CONCLUSION: We developed a structured program for teaching PJ. By implementing this program, learning opportunities for surgical residents and fellows can be increased as a complement to training in the OR.

A case of primary aldosteronism caused by unilateral multiple adrenocortical micronodules presenting as muscle cramps at rest: The importance of functional histopathology for identifying a culprit lesion.

Unilateral multiple adrenocortical micronodules (UMNs) constitute a rare subset of primary aldosteronism (PA) characterized by the hypersecretion of aldosterone derived from multiple small nodules in the zona glomerulosa of the unilateral adrenal grand. This case study describes a 49-year-old man with PA and UMNs who presented with muscle cramps at rest due to hypokalemia. The patient had a 6-year history of hypertension treated with antihypertensive drugs. Imaging studies revealed bilateral adrenal nodules as large as 5 mm. Adrenal venous sampling confirmed unilateral PA; therefore, the patient underwent the removal of the affected adrenal gland. Macroscopically, the removed adrenal gland exhibited irregular adrenocortical thickening accompanied by ill-defined, adrenocortical macronodules as large as 6 mm. The zona glomerulosa was histologically hyperplastic. However, an immunohistochemistry test of the steroidogenic enzymes revealed that these macronodules and the hyperplastic glomerular layer tested negative for CYB11B2. Moreover, we observed adrenocortical micronodules as large as 0.5 mm that tested immunohistochemically positive for CYP11B2 and HSD3B2 but negative for CYP17A1 and CYP11B1. Thus, UMNs were diagnosed. This case instructively indicates that a grossly or histologically detectable nodular lesion is not necessarily a culprit lesion for PA. Therefore, functional histopathology is indispensable for the correct subclassification of PA.

A case of mixed adenoneuroendocrine carcinoma of the gallbladder arising from an intracystic papillary neoplasm associated with pancreaticobiliary maljunction.

A 54-year-old Japanese woman was referred with a gallbladder tumor. Based on the results of the computed tomography scan, endoscopic retrograde cholangiopancreatography, and magnetic resonance cholangiopancreatography, a mucin-producing neoplasm of the gallbladder associated with pancreaticobiliary maljunction was diagnosed. Extended cholecystectomy, extrahepatic bile duct resection, and choledochojejunostomy were performed, and she remains free of recurrence 24 months after resection. Histopathological examination revealed that the papillary component of the lesion was an intracystic papillary neoplasm with diverse characteristics of pancreaticobiliary epithelium and intestinal epithelium including mucin. In this component, most of the papillary lesion was a high-grade intraepithelial neoplasm, but also showed slight invasion into the muscular layer. The nodular component consisted of both poorly differentiated biliary type adenocarcinoma and large cell neuroendocrine carcinoma. We report a rare case of a mixed adenoneuroendocrine carcinoma arising from an intracystic papillary neoplasm associated with pancreaticobiliary maljunction. As for the histogenesis of this tumor, based on the histopathologic appearance, transdifferentiation from poorly differentiated biliary type adenocarcinoma to large cell neuroendocrine carcinoma is considered the most possible histogenesis of this tumor.

Serum ghrelin levels partially recover with the recovery of appetite and food intake after total gastrectomy.

PURPOSE: Ghrelin may lead to weight gain by appetite stimulation. This prospective study investigated the association between weight loss and the ghrelin levels in patients after gastrectomy. METHODS: Thirty-three males and eight females were enrolled in the study. The average age was 66 years. Measurements of the serum ghrelin level and an appetite questionnaire were performed preoperatively and at one, three, six and 12 months postoperatively. RESULTS: The preoperative serum total ghrelin level was 51.6 ± 31.9 (fmol/ml ± SD), and that at one, three, six and 12 months postoperatively was 16.9 ± 9.0, 21.2 ± 16.0, 28.0 ± 19.1 and 29.6 ± 20.6 (fmol/ml ± SD), respectively. The appetite score was 2.02 ± 1.09 points at 1 month, and increased significantly to 2.61 ± 1.00 by 12 months. CONCLUSIONS: The ghrelin levels were reduced after gastrectomy and did not recover by 12 months postoperatively. Further studies are needed to evaluate these results as the basis of a therapeutic trial.

A rare case of leiomyosarcoma with a pleomorphic component of the sigmoid colon.

A 66-year-old man presented to our institution with a positive fecal occult blood test and lower abdominal pain. Although a tumor was found in the sigmoid colon, biopsy and imaging studies failed to enable the diagnosis of the cancer, and the patient underwent surgery for treatment and diagnosis. The tumor had two distinct areas with differing features shown both histopathologically and on imaging; it was thus diagnosed as a leiomyosarcoma of the sigmoid colon with a pleomorphic component. Here, we describe a rare case of leiomyosarcoma of the sigmoid colon with a pleomorphic component. There are no reports of leiomyosarcoma with pleomorphic components arising in the colon in the literature; thus, the recurrence and metastatic characteristics are unknown. Therefore, accumulating cases in the literature may provide valuable insights into diagnosing and treating these rare tumors.

Imaging and pathological characteristics of small acinar cell carcinomas of the pancreas: A report of 3 cases.

We present three patients with T2 acinar cell carcinomas (ACC) (two of which were small) and discuss their clinical and pathological features. Case 1: A 34 year-old woman had a 2.6 cm iso- or hyperdense tumor. Enucleation was performed but final diagnosis was ACC and a pylorus preserving pancreaticoduodenectomy was performed. Case 2: A 35 year-old woman was found to have a 4.5 cm hypervascular tumor in the tail of the pancreas. Distal pancreatectomy was performed. Case 3: A 61 year-old man suffered from acute pancreatitis and was found to have an encapsulated 2.5 cm hypervascular tumor in the head of pancreas. Pylorus-preserving pancreaticoduodenectomy was performed. These three patients with T2 ACCs had common characteristics including well-demarcated exophytic tumors with slow and limited progress, distinctively different from large ACCs and pancreatic ductal adenocarcinomas. ACCs are important in the differential diagnosis of homogeneously or heterogeneously enhancing small pancreatic tumors.

A rare presentation of linea alba hernia involving fibrolipoma of the hepatic round ligament: a case report and literature review.

BACKGROUND: Linea alba hernias are relatively rare types of hernias. They manifest as small protrusions situated in the linea alba between the umbilicus and xiphoid cartilage. Usually, hernia contents comprise the pre-peritoneal fat, omentum, and gastrointestinal tract. However, very few cases of linea alba hernias involving the hepatic round ligament have been reported, to date. CASE PRESENTATION: An 80-year-old woman presented with upper abdominal pain and a 1-week history of a mass in the upper midline. Abdominal computed tomography revealed adipose tissue protruding from the abdominal wall contiguous with the hepatic round ligament, suggesting a linea alba hernia. During surgery, the hernial sac content was found to be a mass, which was resected. A linea alba hernia defect measuring 20 mm was repaired using a mesh. Histopathological findings revealed that the mass included mature adipocyte proliferation with broad fibrous septa, which was diagnosed as fibrolipoma of the hepatic round ligament. CONCLUSIONS: We report the first case of a linea alba hernia involving fibrolipoma of the hepatic round ligament worldwide and describe the clinical features, diagnosis, and surgical procedure with a literature review.

Effect of Postoperative Coffee Consumption on Postoperative Ileus after Abdominal Surgery: An Updated Systematic Review and Meta-Analysis.

BACKGROUND: Previous systematic reviews have not clarified the effect of postoperative coffee consumption on the incidence of postoperative ileus (POI) and the length of hospital stay (LOS). We aimed to assess its effect on these postoperative outcomes. METHODS: Studies evaluating postoperative coffee consumption were searched using electronic databases until September 2021 to perform random-effect meta-analysis. The quality of evidence was assessed using the Cochrane risk-of-bias tool. Caffeinated and decaffeinated coffee were also compared. RESULTS: Thirteen trials (1246 patients) and nine ongoing trials were included. Of the 13 trials, 6 were on colorectal surgery, 5 on caesarean section, and 2 on gynecological surgery. Coffee reduced the time to first defecation (mean difference (MD) -10.1 min; 95% confidence interval (CI) = -14.5 to -5.6), POI (risk ratio 0.42; 95% CI = 0.26 to 0.69); and LOS (MD -1.5; 95% CI = -2.7 to -0.3). This trend was similar in colorectal and gynecological surgeries. Coffee had no adverse effects. There was no difference in POI or LOS between caffeinated and decaffeinated coffee (p > 0.05). The certainty of evidence was low to moderate. CONCLUSION: This review showed that postoperative coffee consumption, regardless of caffeine content, likely reduces POI and LOS after colorectal and gynecological surgery.

A case of insulinoma with hypoglycemia that was better managed with lanreotide than octreotide.

Long-acting somatostatin analogs, including lanreotide slow release (LAN-SR) and octreotide long-acting release (OCT-LAR), can improve hypoglycemia in insulinoma. LAN-SR may be more beneficial in some patients with insulinoma than OCT-LAR.

Remnant pancreatectomy for recurrent or metachronous pancreatic carcinoma detected by FDG-PET: two case reports.

CONTEXT: Although surgical resection is the only curative therapeutic option for recurrent or metachronous pancreatic carcinomas, most such cancers are beyond surgical curability. We herein report on two rare cases of remnant pancreatectomy used to treat recurrent or metachronous pancreatic carcinomas. CASE REPORTS: CASE#1 A 65-year-old male developed weight loss and diabetes mellitus 83 months after a pylorus-preserving pancreaticoduodenectomy followed by two years of adjuvant chemotherapy (5-fluorouracil plus leucovorin plus mitomycin C) for a pancreatic carcinoma in the head of the pancreas (stage IA). An abdominal CT scan revealed a 3 cm tumor in the remnant pancreas which appeared as a 'hot' nodule on FDG-PET. A remnant distal pancreatectomy was performed and a pancreatic carcinoma similar in profile to the primary lesion (stage IIB) was confirmed pathologically. CASE#2 A 67-year-old male showed increased CA 19-9 levels 25 months after a distal pancreatectomy for a pancreatic carcinoma in the body of the pancreas (stage IA). An abdominal CT scan revealed a cystic lesion in the cut end of the pancreas which appeared as a 'hot' nodule on FDG-PET. A remnant proximal pancreatectomy with duodenectomy was performed and a metachronous pancreatic carcinoma (stage III) was confirmed pathologically. CONCLUSION: Remnant pancreatectomy can be considered a treatment option for recurrent or metachronous pancreatic carcinomas. FDG-PET can play a key role in detecting remnant pancreatic carcinomas.

Preoperative pulmonary function tests do not predict the development of pulmonary complications after elective major abdominal surgery: A prospective cohort study.

BACKGROUND: Data describing the association of preoperative pulmonary function testing (PFT) with postoperative pulmonary complications (PPC) are inconsistent. We conducted this prospective study to determine the ability of PFT to predict PPC. MATERIALS AND METHODS: Data were prospectively collected from 676 patients who underwent elective abdominal surgery (emergency and thoracic operations excluded). The primary outcome was the occurrence of PPC within 30 days. Patient and procedure-related factors were examined as risk factors. Multivariate logistic regression analysis was performed using risk factors identified with univariate analysis and area under the curve (AUC) analysis performed. RESULTS: PPC occurred in 29 patients (4.9%). History of smoking or abnormal physical examination were not significantly associated. Multivariate analysis identified age (p = 0.03), operative time (p = 0.02), blood transfusions (p = 0.002), and %VC (p = 0.001) as significant risk factors. AUC with a model including age, operative time, and blood transfusion was 0.83. The addition of %VC to these three variables increased the AUC to 0.89 (p = 0.1). CONCLUSIONS: Age, operative time, blood transfusion, and %VC are significantly associated with an increased risk of PPC. The addition of %VC to other risk factors did not significantly improve the ability to predict PPC, showing that preoperative PFT is not helpful to predict PPC.

Preoperative virtual simulation of adrenal tumors.

BACKGROUND: Retroperitoneal endoscopic adrenalectomy (EA) is recognized as a principal procedure for benign adrenal tumors. However, a limited visual field and a narrow working space make this approach difficult, particularly in cases of obese patients or small tumors. Using multidetector row CT (MD-CT), this study investigated the use of preoperative virtual simulation (PVS) to identify tumor and central vein locations for EA, and verified these findings during EA surgery. PATIENTS AND METHODS: The study enrolled 11 cases comprising 10 adrenal adenomas and one ACTH-independent macronodular adrenal hyperplasia admitted to Jichi Medical University Hospital, Tochigi, Japan, between November 2003 and October 2006. Patients were evaluated in a lateral bending position using MD-CT. 3D PVS images of ribs, vertebrae, kidneys, and adrenal tumors were generated and compared with real images obtained during EA. RESULTS: The PVS images clearly showed the relative locations of the adrenal tumor, kidney, and adjacent anatomical structures. These locations were verified during EA. The central vein was identified in the PVS images in all cases. Information derived from the PVS images assisted in the performance of EA surgery. CONCLUSIONS: Preoperative 3D-simulation images using MD-CT contributed to the safety and efficiency of performing EAs.

Prognostic significance of the degree of lymphatic vessel invasion in locally advanced, surgically resectable pancreatic head cancer: A single center experience.

Little is known concerning the prognostic significance of the degree of lymphatic vessel invasion in pancreatic head cancer. To address this gap in knowledge, we retrospectively examined 60 patients with locally advanced, surgically resectable pancreatic head cancer who underwent pancreaticoduodenectomy and lymph node (LN) dissection.All cases were histopathologically diagnosed as ductal adenocarcinoma, stage II (25 pT3N0 cases, 35 pT3N1 cases). The following variables were investigated: age; sex; neoadjuvant therapy; adjuvant therapy; tumor size; tumor grade; invasion into the serosa, retropancreatic tissue, duodenum, bile duct, portal venous system and perineural area; cut margins; LN metastasis; and the number of invaded lymphatic vessels (LVI-score).Univariate analysis demonstrated that LN metastasis and an LVI-score ≥5 were significantly associated with poor disease-free survival. Multivariate Cox regression analysis confirmed that LN metastasis and an LVI-score ≥7 were significantly associated with poor disease-free survival. Additionally, LVI-scores ≥9 and ≥10 were comparable to or surpassed the significance of LN metastasis based on the hazard ratio. Univariate analysis demonstrated that tumor size >30 mm, duodenal invasion, LN metastasis and an LVI-score ≥2 were significantly associated with poor overall survival. Multivariate Cox regression analysis confirmed that LN metastasis and LVI-scores ≥9 and ≥10 were significantly associated with poor overall survival, and an LVI-score ≥10 was comparable to or surpassed the significance of LN metastasis based on the hazard ratio.Our study strongly suggests that a high degree of lymphatic vessel invasion is associated with a poor prognosis in patients with locally advanced, surgically resectable pancreatic head cancer.

Blockade of pancreatic islet-derived ghrelin enhances insulin secretion to prevent high-fat diet-induced glucose intolerance.

The gastric hormone ghrelin and its receptor, growth hormone secretagogue receptor (GHSR), are expressed in pancreas. Here, we report that ghrelin is released from pancreatic islets to regulate glucose-induced insulin release. Plasma concentrations of ghrelin, as well as insulin, were higher in pancreatic veins than in arteries. GHSR antagonist and immunoneutralization of endogenous ghrelin enhanced glucose-induced insulin release from perfused pancreas, whereas exogenous ghrelin suppressed it. GHSR antagonist increased plasma insulin levels in gastrectomized and normal rats to a similar extent. Ghrelin knockout mice displayed enhanced glucose-induced insulin release from isolated islets, whereas islet density, size, insulin content, and insulin mRNA levels were unaltered. Glucose tolerance tests (GTTs) in ghrelin knockout mice showed increased insulin and decreased glucose responses. Treatment with high-fat diet produced glucose intolerance in GTTs in wild-type mice. In ghrelin knockout mice, the high-fat diet-induced glucose intolerance was largely prevented, whereas insulin responses to GTTs were markedly enhanced. These findings demonstrate that ghrelin originating from pancreatic islets is a physiological regulator of glucose-induced insulin release. Antagonism of the ghrelin function can enhance insulin release to meet increased demand for insulin in high-fat diet-induced obesity and thereby normalize glycemic control, which may provide a potential therapeutic application to counteract the progression of type 2 diabetes.

Alcoholic pancreatopathy: a proposed new diagnostic category representing the preclinical stage of alcoholic pancreatic injury.

Alcoholic chronic pancreatitis (CP) is not usually diagnosed until the end stage of the disease, and hence enormous medical and social resources are consumed in the treatment of established alcoholic CP. With the aim of early diagnosis and prevention of alcoholic CP, we here propose "alcoholic pancreatopathy" as a new category of pancreatic disorder induced by alcohol intake. In addition to a history of excessive alcohol intake (>80 g/day), the presence of at least one of the following conditions establishes the diagnosis of alcoholic pancreatopathy: 1. History of alcoholic acute pancreatitis. 2. Recurrent abdominal pain or gastrointestinal symptoms induced by alcohol intake. 3. Hyperamylasemia or a high serum level of any other pancreatic enzymes. 4. Abnormal findings in the pancreas by routine abdominal ultrasonography. Alcoholic pancreatopathy is a comprehensive concept that includes the early stage of pancreatic injury induced by alcohol, and is useful for detecting the preclinical stage of pancreatic injury induced by alcohol and hence for treating the early stage of the disease. Further assessments and well-designed studies for investigating the early stage of alcoholic CP are necessary, in which alcoholic pancreatopathy could play a key role.

Usefulness of endoscopic ultrasound to diagnose the severity of chronic pancreatitis.

Endoscopic ultrasonography (EUS) is considered the most sensitive imaging method for the diagnosis of chronic pancreatitis (CP). Several investigators have shown that EUS findings of CP correlate with the presence of CP on endoscopic retrograde pancreatography (ERP). In general, for diagnosing CP using EUS, the presence or absence of the following EUS criteria is determined: hyperechoic foci, hyperechoic strands, lobularity, shadowing calcifications, cysts, hyperechoic duct margins, visible side branches, main pancreatic duct dilatation, and main pancreatic duct irregularity. Using these criteria, we reviewed the number of EUS criteria required to diagnose early CP and whether each EUS criterion correlates with the severity of CP on ERP. CP is likely when more than three criteria (for "early CP") or more than five criteria (for "moderate CP") are present. Moreover, each EUS criterion has its own importance at each ERP classification level. However, the obtained images can be operator dependent, and interobserver variability may affect interpretation of CP by EUS. Therefore, we performed a quantitative computer analysis of parenchymal echogenicity and compared it with the EUS diagnosis of CP so that the diagnosis of CP on the basis of EUS criteria could be objectively supported by the quantitative analysis of EUS images. In conclusion, EUS can objectively distinguish between a normal pancreas and CP, and can be used to evaluate the severity of the CP. EUS is a useful modality for diagnosing CP and is relatively less invasive than other available modalities.

Follicular lymphoma of the pancreas: a case report and proposed new strategies for diagnosis and surgery of benign or low-grade malignant lesions of the head of the pancreas.

CONTEXT: Primary pancreatic lymphoma is a rare form of extranodal lymphoma originating in the pancreas. The present report describes a case of follicular lymphoma of the pancreas with unique CT and MRI findings. CASE REPORT: A 58-year-old male complained of sudden abdominal pain, and routine ultrasonography detected an 8 cm hypoechoic tumor in the head of the pancreas. The 3D image generated using multi-cholangiography and virtual duodenography provided the information necessary for a laparotomy. The tumor was enucleated for diagnosis. Follicular lymphoma is quite rare in the pancreas and gastrointestinal tract. A considerable number of pancreatic lymphoma subtypes have been reported. The expression "pancreatic lymphoma" has been used to describe both primary lymphoid neoplasms originating in the pancreatic parenchyma and tumors invading from a peri-pancreatic lymphadenopathy. The present case belongs to the latter, which might explain the unique imaging findings and histological type. These subtypes display different imaging findings and different clinical characteristics. In the future, primary pancreatic lymphoma should be discussed separately depending on the subtype. CONCLUSION: We propose a new subtype of primary pancreatic lymphoma. Multi-cholangiography and virtual duodenography provided the information necessary for a laparotomy in the present case. Enucleation is indicated for benign and low-grade malignant tumors of the pancreas, even if the tumor is located in the head of the pancreas.

Consensus of primary care in acute pancreatitis in Japan.

The incidence of acute pancreatitis in Japan is increasing and ranges from 187 to 347 cases per million populations. Case fatality was 0.2% for mild to moderate, and 9.0% for severe acute pancreatitis in Japan in 2003. Experts in pancreatitis in Japan made this document focusing on the practical aspects in the early management of patients with acute pancreatitis. The correct diagnosis of acute pancreatitis and severity stratification should be made in all patients using the criteria for the diagnosis of acute pancreatitis and the multifactor scoring system proposed by the Research Committee of Intractable Diseases of the Pancreas as early as possible. All patients diagnosed with acute pancreatitis should be managed in the hospital. Monitoring of blood pressure, pulse and respiratory rate, body temperature, hourly urinary volume, and blood oxygen saturation level is essential in the management of such patients. Early vigorous intravenous hydration is of foremost importance to stabilize circulatory dynamics. Adequate pain relief with opiates is also important. In severe acute pancreatitis, prophylactic intravenous administration of antibiotics at an early stage is recommended. Administration of protease inhibitors should be initiated as soon as the diagnosis of acute pancreatitis is confirmed. A combination of enteral feeding with parenteral nutrition from early stage is recommended if there are no clear signs and symptoms of ileus and gastrointestinal bleeding. Patients with severe acute pancreatitis should be transferred to ICU as early as possible to perform special measures such as continuous regional arterial infusion of protease inhibitors and antibiotics, and continuous hemodiafiltration. The Japanese Government covers medical care expense for severe acute pancreatitis as one of the projects of Research on Measures for Intractable Diseases.

Total gastrectomy-induced reductions in food intake and weight are counteracted by rikkunshito by attenuating glucagon-like peptide-1 elevation in rats.

BACKGROUND: Decrease in appetite and weight after total gastrectomy in patients with gastric cancer leads to a decrease in quality of life, increased mortality, and may necessitate discontinuation of adjuvant chemotherapy. The aim of this study is to determine whether rikkunshito, a Japanese herbal medicine, increases food intake and weight after gastrectomy in rats. METHODS: Male rats underwent gastrectomy followed by roux-en-Y reconstruction or sham operation and were then treated with rikkunshito for 14 days starting on postoperative day 3. Daily food intake, weight, plasma glucagon-like peptide-1 (GLP-1), and ghrelin levels were measured. A pilot study to measure pre- and postoperative plasma GLP-1 levels was conducted in patients who underwent total gastrectomy for gastric cancer. RESULTS: Administration of rikkunshito after gastrectomy in rats significantly increased food intake and weight, which continued for at least 2 weeks after treatment. Both fasting and postprandial plasma GLP-1 levels were increased markedly after gastrectomy compared with sham-operated animals. Increased GLP-1 levels in rats after gastrectomy were suppressed markedly by rikkunshito. rikkunshito had no significant effect on plasma ghrelin levels after gastrectomy. Treatment with a GLP-1 receptor antagonist significantly improved food intake and weight after gastrectomy. Plasma fasting GLP-1 levels in patients with gastric cancer were increased greatly after gastrectomy on postoperative day 1. CONCLUSION: Administration of rikkunshito suppresses plasma GLP-1 levels after total gastrectomy, which is associated with recovery from reduced food intake and weight in rats.

Post-ERCP pancreatogastric fistula associated with an intraductal papillary-mucinous neoplasm of the pancreas--a case report and literature review.

BACKGROUND: Fistula formation has been reported in intraductal papillary-mucinous neoplasms (IPMNs) with or without invasion of the adjacent organs. The presence or absence of invasion is mostly determined by postoperative histological examination rather than by preoperative work-up. CASE PRESENTATION: A 72 year-old Japanese woman showed remarkable dilatation of the main pancreatic duct (MPD) in the distal region of the pancreas. Subsequent ERCP also showed MPD dilatation, after which the patient suffered moderate pancreatitis. A subsequent gastroscopy revealed a small ulceration that had not been observed in a gastroscopy performed 3 months prior. Mucinous discharge from the ulceration suggested it might be the orifice of a fistula connected to the MPD. En bloc resection including the distal region of the pancreas, spleen, stomach and part of the transverse colon was performed under the pre- and intraoperative diagnosis of an invasive malignant IPMN. However, histopathology revealed the lesion to be of "borderline malignancy" without apparent invasion of the stomach. Light microscopy showed inflammatory cellular infiltrates (mainly neutrophils) around the pancreatogastric fistula, but there was no evidence of neoplastic epithelia lining the fistulous tract. CONCLUSION: This case highlights that a pancreatogastric fistula can develop after acute inflammation of the pancreas in the absence of cancer invasion. Further information regarding IPMN-associated fistulae is necessary to clarify the pathogenesis, diagnosis, appropriate surgical intervention and prognosis for this disorder.