[Combination of intraductal papillary mucinous neoplasm with other cystic pancreatic tumors]. / Sochetanie vnutriprotokovoi papillyarnoi mutsinoznoi opukholi s drugimi kistoznymi opukholyami podzheludochnoi zhelezy.

Cystic tumors of the pancreas are uncommon entities. Synchronic occurrence of intraductal papillary mucinous neoplasm (IPMN) and other pancreatic tumors is extremely rare. Two patients with this diagnosis are reported in the manuscript. Cystic tumors of the pancreas can rarely occur in various combinations while malignancy potential of each neoplasm may be different. Surgery depends on localization and type of each tumor and must be determined individually.

[Endoscopic treatment of duodenal duplication cyst]. / Endoskopicheskoe lechenie duplikatsionnoi kisty dvenadtsatiperstnoi kishki.

Duodenal duplication cyst (DDC) is a rare form of intestinal malformation (2-12% of all gastrointestinal duplications). There are many difficulties in diagnosis and management of DDC. We present a case of successful endoscopic transluminal treatment of DDC in a 30-year-old female. She complained of epigastric pain, nausea and vomiting, weight loss of 5 kg over the past 3 months. Laparoscopic cholecystectomy for gallstone disease was performed 18 months prior to admission. Examination revealed a cyst 52×60?35 mm in descending part of duodenum. There was a calculus inside the cyst. Transluminal endoscopic cyst fenestration was performed. Histological examination confirmed DDC. According to control duodenoscopy data, cyst was collapsed. The patient remains asymptomatic three months after surgery. DDC is a rare disease of gastrointestinal tract, which should be differentiated first with choledochocele Todani type III and intraluminal duodenal diverticulum. Endoscopic treatment may be an adequate alternative to traditional interventions in some cases.

[Pancreatic proinsulinoma]. / Proinsulinoma podzheludochnoi zhelezy.

OBJECTIVE: To report own experience in the treatment of patients with proinsulinoma. MATERIAL AND METHODS: There were 10 patients with increased proinsulin production and normal insulin level since 2017. Most of them were young women. RESULTS: Fasting hypoglycemia in all patients was severe (up to 0.7 mmol/l). Clinical picture consisted of typical symptoms similar to those in insulinoma. The main difference in the course of proinsulinoma was the absence of weight gain in 7 patients and rapid weight loss (from 210 to 90 kg within 9 months) in 1 patient. All patients with proinsulinoma underwent surgery. In most cases, minimally aggressive surgery was performed. CONCLUSION: Proinsulinoma is an extremely rare endocrine-active neuroendocrine pancreatic tumor. Differential features of proinsulinoma are the absence of weight gain and normal insulin levels in the presence of hypoglycemia. Surgery is the only radical method of treatment.

[Prevention of pancreatic fistula after pancreatoduodenectomy]. / Profilaktika pankreaticheskogo svishcha posle pankreatoduodenal'noi rezektsii.

OBJECTIVE: Prospective randomized investigation of the efficiency of somatostatin analogues and glucocorticoids in pancreatic fistula prevention after pancreatoduodenectomy by using. MATERIAL AND METHODS: In period from December 2018 till March 2020 78 patients underwent pancreatoduodenectomy for pancreatobilliary tumors in department of abdominal surgery of National Medical Research Center of Surgery named after A.V. Vishnevsky. Intraoperative frozen section investigation of pancreatic functioning acinar structures (FAS) was held for all patients. 38 patients had more than 40% of FAC and were related with high risk of pancreatic fistula (PF), while 40 patients with less than 40% FAC were included in low risk of PF group. In both groups patients were randomized to main and control subgroups. In main subgroup of high risk group patients combination of somatostatin analogues and glucocorticoids was used, while in control subgroup patients received only somatostatin analogue. In low risk of PF group patients of main subgroup preventively got somatostatin analogue, while control group patients had no specific prophylaxis of PF. To assess the effect of drug prophylaxis on the development of pancreatic fistula we used logistic regression models with the inclusion of the drug use factor as an independent variable. RESULTS: 25 patients were included in main subgroup of high risk group. Clinically relevant pancreatic fistula (CRPF) developed in 14 (56%) cases. From 13 patients of control subgroup CRPF developed in 5 (38%) cases. In main subgroup of low risk group 18 patients were included and 3 (16%) of them had CRPF. In control subgroup were 22 patients and there were no cases of CRPF. CONCLUSION: In our series combination of somatostatin analogue and glucocorticoid didn't show efficiency in prevention of CRPF in high risk patients, although difference between subgroups wasn't statistically significant (p=0.34). In low risk group patients prophylactic use of somatostatin analogue also didn't show decline of CRPF incidence and the difference between subgroups also wasn't statistically significant (p=0.46).

[Diagnostic and treatment of the intraductal papillary mucinous tumor of pancreas]. / Diagnostika i lechenie vnutriprotokovoi papilliarnoi mutsinoznoi opukholi podzheludochnoi zhelezy.

OBJECTIVE: Adjustment of diagnostics and management of the surgical treatment of patients with intraductal papillary mucinous tumor of pancreas. MATERIAL AND METHODS: From 2012 to 2018, 45 patients with intraductal papillary mucinous tumor were observed. During the observation the ultrasound examination, contrast-enhanced computed tomography and magnetic resonance tomography with contrast were used. In 29 cases radical surgery was performed, nonradical in 1 case; case follow-up is chosen for 15 patients. RESULTS: Intraductal papillary mucinous tumor was diagnosed and the definition of the type of tumor was made on the base of 2 types of imaging methods. Intraductal papillary mucinous tumor type 1 was founded in 5 (11%), whereas intraductal papillary mucinous tumor type 2 was founded in 20 (44,5%) and intraductal papillary mucinous tumor type 3 was observed in 20 (44,5%) cases. Intraductal papillary mucinous tumor associated with carcinoma was observed in 16 cases. Pancreaticoduodenal resection was performed in 20, distal exsection of pancreas was performed in 4 cases (2 in open manner access, 2 in robot-assisted manner), pancreatic head resection was performed in 3 cases (1 in open manner access, 2 in laparoscopic access) and in 2 cases the duodenopancreatectomy was performed. Explorative laparotomy was performed in case of intraductal papillary mucinous tumor type 2 associated with mucilaginous carcinoma and miliary metastasis in the liver. Early postoperative complications were observed in 5 cases (16, 6%): biliary fistula (n=2), postoperative wound infection (n=2), arrosive hemorrhage type B in ISGPS (n=1, was treated in an X-ray endovascular manner). Case follow-up was chosen in 15 cases of intraductal papillary mucinous tumor over the course of 6 to 74 months and disease progression was not observed. CONCLUSION: Intraductal papillary mucinous tumor is a condition associated with high risk of malignant change and demands early disease detection. The treatment should be provided in medical centers that specialize in the pancreas deceases, where a full patient examination as well as a clear-eyed understanding of diagnostic information with the execution of desirable type of surgical intervention with the guaranty of achievement R0 condition can be offered.

[Predicting of pancreatic fistula after pancreatoduodenectomy]. / Prognozirovanie vozniknoveniya pankreaticheskogo svishcha posle pankreatoduodenal'noi rezektsii.

OBJECTIVE: Identifying the opportunity of objective prognosis of pancreatic fistula emergence after pancreatoduodenectomy. MATERIAL AND METHODS: In the department of abdominal surgery in 2016-2019, 177 pancreatoduodenectomies for pancreatobiliary tumors were performed. 4 risk factors were identified: type of tumor, preoperative CT with an accumulation coefficient in the pancreas of more than 1, soft pancreas, the number of functioning acinar structures identified during intraoperative histological examination. Statistical data processing and predictive modeling were performed using a binary logistic regression model. RESULTS: Clinically significant pancreatic fistula was developed in 47 (26,6%) patients. Risk indicators for the occurrence of pancreatic fistula depending on the presence or absence of risk factors were obtained. Groups of patients were identified that require various preventive and therapeutic measures aimed to treat postoperative pancreatitis and its consequences. CONCLUSION: Predicting the pancreatic fistula emergence allows to take timely preventive and therapeutic measures, both minimal and aggressive (early extracorporeal detoxification, pancreatectomy), which may lead to complications. Well-reasoned pancreatectomy and extracorporeal detoxification is a surgeon's defense in an insured case or legal conflict.

[Diagnosis and surgical treatment of duodenal tumors]. / Diagnostika i khirurgicheskoe lechenie opukholei dvenadtsatiperstnoi kishki.

AIM: To present the experience in diagnosis and surgical treatment of duodenal tumors. MATERIAL AND METHODS: The study included 27 patients with different duodenal tumors: adenocarcinoma (AC, n=8), gastrointestinal stromal tumor (GIST, n=13), neuroendocrine tumor (NET, n=6). The examination included computed tomography (in 27 patients), magnetic resonance imaging (12), transcutaneous ultrasound (14), endosonography (16), esophagogastroduodenoscopy (16). All patients were operated. Conventional (18), laparoscopic (4), robot-assisted (4), endoscopic endoluminal (1) surgical interventions were performed. 17 patients were followed up from 8 months to 10 years (median 26 months). RESULTS: According to the instrumental diagnostic methods, duodenal tumors were verified in 19 cases. Five patients with AC underwent pancreaticoduodenectomy (Whipple procedure), 2 - palliative operations (bypass gastroenteroanastomosis), 1 - explorative laparotomy. Patients with GIST underwent 3 pancreaticoduodenectomies and 10 duodenectomies: traditional (4), laparoscopic (4) and robot-assisted (2) approaches. In case of NET 3 interventions via traditional approach (pancreaticoduodenectomy, duodenal resection, tumor enucleation), 1 endoscopic endoluminal operation, 2 robot-assisted operations (duodenal resection and duodenopancreatectomy, splenectomy, distal gastrectomy) were performed. Postoperative complications occurred in 10 (37%) patients. Postoperative mortality was absent. Long-term results were analyzed in 17 patients. All patients with GIST and NET are alive without disease progression. Two AC patients are alive from those who are available. CONCLUSION: Duodenal tumors are relatively rare. Radical surgical intervention in accordance with oncological principles is preferred for these patients. Organ-preserving procedures may be applied depending on morphological type of tumor. Examination and treatment of patients with duodenal tumors should be carried out in specialized surgical departments.

[Intraductal papillary mucinous neoplasm of pancreas]. / Vnutriprotokovaia papilliarnaia mutsinoznaia opukhol' podzheludochnoi zhelezy.

Intraductal papillary mucinous neoplasm (IPMN) is the most common cystic pancreatic tumor. There are 3 ductal types of this tumor depending on localization. Several histological subtypes determine clinical course and prognosis. The problems of diagnosis, surgical treatment and follow-up are reviewed in several guidelines. Literature review devoted to pancreatic IPMN is presented in the article, the latest guidelines are compared.

[Duodenopancreatectomy for pancreatic tumors - pros and cons]. / Duodenopankreatéktomiia pri opukholiakh podzheludochnoi zhelezy - PRO ET CONTRA.

AIM: To optimize surgical treatment of multiple and advanced pancreatic tumors. MATERIAL AND METHODS: There were 852 patients with various pancreatic tumors for the period 2011 - September 2019. Duodenopancreatectomy (DPE) was performed in 18 patients. Locally advanced ductal adenocarcinoma was diagnosed in 10 patients, acinar cell carcinoma - in 1 patient, multiple neuroendocrine tumors - in 4 cases, intraductal papillary mucinous tumor - in 2 patients, multiple metastases of renal cell carcinoma - in 1 patient. This procedure was avoided in 9 patients who underwent alternative operations: pancreatoduodenectomy (PDE) with pancreatic body resection for intraductal papillary mucinous tumor - 5 cases, two-stage (2) and one-stage (1) distal pancreatectomy and PDE for multiple neuroendocrine tumors - 2 patients, simultaneous pancreatic head resection and distal pancreatectomy for multiple metastases of renal cell carcinoma - 1 patient. RESULTS: Postoperative complications occurred in 14 patients after DPE (77.8%) and in 5 patients after alternative operations (55.5%). Alternative procedures in patients with neuroendocrine tumors, intraductal papillary mucinous tumors and metastases of renal cell carcinoma ensured radical surgical treatment. These patients did not need for insulin replacement therapy and enzyme drugs. CONCLUSION: Strict adherence to oncological canons and differentiated approach in patients with multiple neuroendocrine tumors, metastases of renal cell carcinoma and intraductal papillary mucinous tumors are essential to avoid DPE in some cases in favor of alternative operations.

[Intrapancreatic accessory spleen]. / Dobavochnaia selezenka v parenkhime podzheludochnoi zhelezy.

BACKGROUND: Accessory spleen is the human growth anomaly, which appears in embryogenesis and frequently becomes an accidental finding during prophylactic medical examination. Pancreatic tail - the second frequent localization after the splenic hilus. Intrapancreatic accessory spleen can mimic the pancreatic tumor. AIM: To demonstrate case series of intrapancreatic accessory spleen in course of differential diagnostic with pancreatic neuroendocrine tumor and metastasis of renal - cell cancer. MATERIAL AND METHODS: Three patients with intrapancreatic accessory spleen were observed in abdominal department #1 A.V.Vishnevsky Institute of Surgery, - two females and one male. RESULTS: Two patients were surgically treated: in the first case basing on preoperative anamnesis and diagnostic data diagnosis of renal - cell cancer metastasis was established, in the second case - nonfunctional pancreatic neuroendocrine tumor. In both cases robotic distal pancreatectomy was performed. There were no conversions. Postoperative recovery was accompanied by clinicaly not relevant pancreatic fistulas, which didn't increase length of hospitalization. In the third case during CT and MRI diagnosis of intrapancreatic accessory spleen was determined. Surgical treatment wasn't performed. Control examination showed an absence of dynamic of characteristics and growth. CONCLUSION: Described cases demonstrate difficulty of differential diagnostics of tumor - like mass. Neuroendocrine tumors, renal - cell cancer metastases, solid pseudopapillary neoplasms and accessory spleen can have similar CT-characteristics. In appearance of differential diagnostic difficulties minimally invasive surgical treatment has to be performed.

[Current issues in pancreatic surgery]. / Aktual'nye voprosy khirurgii podzheludochnoi zhelezy.

AIM: To present own experience of pancreatic surgery and to analyze literature data for this issue. MATERIAL AND METHODS: We have analyzed work of abdominal surgery department over the last 5 years. Moreover, MEDLINE and RSCI databases regarding surgical treatment of pancreatic diseases were assessed. RESULTS: There were 456 pancreatectomies. Postoperative complications arose in 176 (38.6%) patients, 11 patients died (2.4%). According to world data, mortality after pancreatectomy reaches 10%. Only creation of specialized centers is proven way to improve the outcomes. CONCLUSION: Current medical assistance for pancreatic disease may be only achieved in specialized centers with large number of various pancreatic procedures. The organization of such centers is required throughout the country and certain accreditation criteria should be developed for this purpose. Targeted routing of patients to specialized pancreatology centers will be able to reduce incidence of diagnostic, tactical and technical errors.

Contrast-enhanced MDCT in patients with pancreatic neuroendocrine tumours: correlation with histological findings and diagnostic performance in differentiation between tumour grades.

AIM: To identify the multidetector computed tomography (MDCT) features of pancreatic neuroendocrine tumours (pNETs), which correlate with tumour histology and enable preoperative grading. MATERIALS AND METHODS: Thirty-nine patients with histologically confirmed pNET who underwent preoperative contrast-enhanced MDCT were included in this study. Nineteen tumours were classified as Grade 1 (G1) and 20 as Grade 2 (G2). Histopathology slides were reviewed to assess the intratumoural microvascular density (MVD) and the amount of tumour stroma. Computed tomography (CT) image analysis included tumour size, margin delineation, calcifications, homogeneity, contrast enhancement (CE) pattern, tumour absolute and relative enhancement, presence of cystic changes, pancreatic duct dilatation, regional and distant metastases. The diagnostic ability to predict tumour grade was measured for each MDCT finding and their combinations. RESULTS: The mean arterial enhancement ratio had a mean±standard deviation of 1.53±0.45 in G1 and 1.01±0.33 in G2 pNETs (p=0.0003) and correlated with intratumoural microvascular density (MVD; r=0.55, p=0.0002). Tissue stroma percentage did not correlate with imaging findings. Late CE of the tumour (the peak attenuation observed in the venous phase) was significantly associated with G2. Tumour size >20 mm, arterial enhancement ratio <1.1, and late CE showed 74.4%, 79.5%, and 74.4% accuracy, respectively, in diagnosing G2 tumours, while the accuracy of at least two of these criteria used in combination was 82%. Based on these results, a diagnostic algorithm was proposed, which showed high interobserver agreement (k=0.82) in the prediction of tumour grade. CONCLUSION: Contrast-enhanced MDCT features correlate with histological findings and enable the differentiation between G1 and G2 pNETs during preoperative examination.

[Surgical treatment of retroperitoneal masses]. / Khirurgicheskoe lechenie neorgannykh zabriushinnykh opukholei.

AIM: To improve the results of treatment of patients with retroperitoneal tumors. MATERIAL AND METHODS: The study included 83 patients with retroperitoneal tumors including 57 cases of benign tumors and 26 patients with malignancies. Laparotomy (Lt), robot-assisted (RA) and laparoscopic (Ls) techniques were used in 35, 34 and 14 patients respectively. Median tumor sizes in the largest dimension were 102 mm, 75 mm and 81.5 mm in Lt, RA and Ls groups respectively. RESULTS: Average time of surgery was 112.5 minutes in Lt-group, 140 min in RA group and 125 minutes in Ls group. Median blood loss was 125 ml, 50 ml and 50 ml in the same groups respectively. Conversion was performed in 1 patient during RA-surgery and in 7 patients during laparoscopy. Postoperative complications occurred in 6 patients after laparotomy and in 5 patients after RA-intervention. There were no deaths. CONCLUSION: Comprehensive evaluation of different surgical methods is necessary to achieve successful treatment of retroperitoneal tumors. Conventional approach is indicated for tumors over 10 cm while minimally invasive techniques are justified for tumors less than 10 cm. RA-interventions facilitates surgery for tumors located in difficult areas and small anatomical spaces as well as for neoplasms adjacent to great vessels.

Organic hyperinsulinism: radiological diagnostics and surgical treatment.

AIM: To optimize the diagnosis and surgical treatment of insulinoma and nesidioblastosis. MATERIAL AND METHODS: 42 patients with organic hyperinsulinism (OH) were operated. There were 39 cases of insulinoma including 2 patients with insulinoma combined with nesidioblastosis and 3 cases of nesidioblastosis alone. Preoperative ray imaging consisted of percutaneous, endoscopic and intraoperative sonography, contrast-enhanced computed tomography, magnetic resonance imaging (MRI). Functional test included arterial-stimulated blood sampling (ASBS). Laparotomy and robot-assisted techniques were used in 22 and 20 patients. RESULTS: Sensitivity was 62.0%, 76.9%, 83.3%, 87.5%, 94.8% and 100% in percutaneous sonography, CT, endoscopic sonography, MRI, intraoperative sonography and ASBS respectively. Postoperative complications were observed in 14 and 6 patients after conventional and robot-assisted surgery. 2 patients died. Overall mortality was 4.8%. None patient had recurrent hypoglycemic conditions in long-term postoperative period (mean follow-up 18.7 months). CONCLUSIONS: Comprehensive survey allowed to define the cause of OH. Minimally invasive organ-sparing surgery has satisfactory immediate and remote results in these patients.

[Minimally invasive surgical treatment of gastrointestinal stromal tumor].

It was operated 24 patients with gastrointestinal stromal tumor (GIST). Robot-assisted method was applied in 15 observations, laparoscopy - in 9 patients. Laparoscopic operations were preferable for GIST localized in anterior wall or greater curvature of stomach, in small intestine and caecum. Robot-assisted GIST removal was performed in case its location in posterior wall of stomach, on lesser curvature of stomach, in duodenum, what required organ's dissection or had a risk of great vessel injury.

[Robot-assisted pancreatoduodenectomy].

AIM: To compare the results of robot-assisted and conventional techniques of pancreatoduodenectomy. MATERIAL AND METHODS: It was performed the retrospective investigation of results of robot-assisted and conventional pylorus-preserving pancreatoduodenectomy in 7 and 7 patients respectively. RESULTS: Duration of robot-assisted and conventional surgery was 460.71±119.77 and 288.57±62.2 minutes, volume of blood loss--414.28±285.36 and 400±163.30 ml respectively. Postoperative complications after robot-assisted technique were classified as Grade I according to Clavien-Dindo classification. Pancreatic fistulae were absent (ISGPF (2005)). Lower duration of abdominal drainage and opioid analgesia were observed. Also narcotic drugs were required by not all patients after robot-assisted surgery. Histological study revealed the large number of excised lymphatic nodes. CONCLUSION: Obvious advantage of robot-assisted operation was precision of great vessels and lymphatic nodes dissection, performing anastomoses. Robot-assisted pancreatoduodenectomy corresponds to all requirements inherent to radical cancer surgery.

[Cost price of robot-assisted and laparoscopic operations].

High cost of robotized complex and expendables is significant difficulty for its acquisition and introduction of robot-assisted operations. Critical estimation of economic aspect is necessary for further development of robot-assisted surgery in our country. Because of robotic variant is alternative to laparoscopic technique we assessed the prime cost of robot-assisted and laparoscopic operations. The results may be used to assess recovery of expenses by state for high-technology care in clinic and to increase volumes of high-technology care using robotic techniques.