Multidetector computer tomography and magnetic resonance imaging of double superior mesenteric veins:A case report

BACKGROUND This study aimed to describe the findings of double superior mesenteric veins(SMVs),a rare anatomical variation,on multidetector computer tomography(MDCT)and magnetic resonance imaging(MRI)images.CASE SUMMARY We describe the case of a 34-year-old male,who underwent both MDC and MRI examinations of the upper abdomen because of liver cirrhosis.MDCT and MRI angiography images of the upper abdomen revealed an anatomic variation of the superior mesenteric vein(SMV),the double SMVs.CONCLUSION The double SMVs are a congenital abnormality without potential clinical manifestation.Physicians need to be aware of this anatomical variation during abdominal surgery to avoid iatrogenic injury.

Clinical outcomes of transcatheter selective superior mesenteric artery urokinase infusion therapy vs transjugular intrahepatic portosystemic shunt in patients with cirrhosis and acute portal vein thrombosis

AIM To compare the outcomes of transcatheter superior mesenteric artery(SMA) urokinase infusion and transjugular intrahepatic portosystemic shunt(TIPS) for acute portal vein thrombosis(PVT) in cirrhosis.METHODS From January 2013 to December 2014, patients with liver cirrhosis and acute symptomatic PVT who met the inclusion criteria were randomly assigned to either an SMA group or a TIPS group. The two groups accepted transcatheter selective SMA urokinase infusion therapyand TIPS, respectively. The total follow-up time was24 mo. The primary outcome measure was the change in portal vein patency status which was evaluated by angio-computed tomography or Doppler ultrasound.Secondary outcomes were rebleeding and hepatic encephalopathy.RESULTS A total of 40 patients were enrolled, with 20 assigned to the SMA group and 20 to the TIPS group. The symptoms of all patients in the two groups improved within 48 h. PVT was improved in 17(85%) patients in the SMA group and 14(70%) patients in the TIPS group. The main portal vein(MPV) thrombosis was significantly reduced in both groups(P < 0.001), and there was no significant difference between them(P= 0.304). In the SMA group, superior mesenteric vein(SMV) thrombosis and splenic vein(SV) thrombosis were significantly reduced(P = 0.048 and P = 0.02),which did not occur in the TIPS group. At 6-, 12-,and 24-mo follow-up, in the SMA group and the TIPS group, the cumulative rates free of the first episode of rebleeding were 80%, 65%, and 45% vs 90%, 80%,and 60%, respectively(P = 0.320); the cumulative rates free of the first episode of hepatic encephalopathy were 85%, 80%, and 65% vs 50%, 40%, and 35%,respectively(P = 0.022).CONCLUSION Transcatheter selective SMA urokinase infusion and TIPS are safe and effective for acute symptomatic PVT in cirrhosis.

Interventional treatment for symptomatic acute-subacute portal and superior mesenteric vein thrombosis

AIM: To summarize our methods and experience with interventional treatment for symptomatic acute-sub-acute portal vein and superior mesenteric vein throm-bosis (PV-SMV) thrombosis. METHODS: Forty-six patients (30 males, 16 females, aged 17-68 years) with symptomatic acute-subacute portal and superior mesenteric vein thrombosis were ac-curately diagnosed with Doppler ultrasound scans, com-puted tomography and magnetic resonance imaging. They were treated with interventional therapy, including direct thrombolysis (26 cases through a transjugular intrahepatic portosystemic shunt; 6 through percutane-ous transhepatic portal vein cannulation) and indirect thrombolysis (10 through the femoral artery to superior mesenteric artery catheterization; 4 through the radial artery to superior mesenteric artery catheterization). RESULTS: The blood reperfusion of PV-SMV was achieved completely or partially in 34 patients 3-13 d after thrombolysis. In 11 patients there was no PV-SMV blood reperfusion but the number of collateral vessels increased signif icantly. Symptoms in these 45 patients were improved dramatically without severe operationalcomplications. In 1 patient, the thrombi did not respond to the interventional treatment and resulted in intestinal necrosis, which required surgical treatment. In 3 patients with interventional treatment, thrombi reformed 1, 3 and 4 mo after treatment. In these 3 patients, indirect PV-SMV thrombolysis was performed again and was successful. CONCLUSION: Interventional treatment, including direct or indirect PV-SMV thrombolysis, is a safe and effective method for patients with symptomatic acutesubacute PV-SMV thrombosis.

Pancreaticoduodenectomy with portal vein/superior mesenteric vein resection for patients with pancreatic cancer with venous invasion

BACKGROUND： With the development of new surgical tech- niques, pancreaticoduodenectomy （PD） with portal vein or superior mesenteric vein （PV/SMV） resection has been used in the treatment of patients with borderline resectable pan- creatic cancer. However, opinions of surgeons differ in the effectiveness of this surgical technique. This study aimed to investigate the effectiveness of this approach in patients with pancreatic cancer. METHODS： Follow-up visits and retrospective analysis were carried out of 208 patients with pancreatic cancer who had undergone PD （PD group） and PD combined with PV/SMV resection and reconstruction （PDVR group） from June 2009 to May 2013 at our center. Statistical analysis was performed to compare the clinical features, the difference of survival time and risk factors of venous invasion in pancreatic cancer. Factors relating to postoperative survival time of pancreatic cancer were also investigated. RESULTS： In the PDVR group, which consisted of 42 cases, the 1-, 2- and 3-year survival rates were 70%, 41% and 16%, respective- ly and the median survival time was 20.0 months. Among the 166 patients in the PD group, the 1-, 2- and 3-year survival rates were 80%, 52%, and 12%, respectively with the median survival time of 26.0 months. No significant difference in survival time and R0 resection ratio was found between the two groups. Lum- bodorsal pain, tumor with pancreatic capsular invasion and bile duct infiltration were found to be independent risk factors for PV invasion in pancreatic cancer. In addition, non R0 resection,large tumor size （〉2 cm） and poorly differentiated tumor were independent risk factors for survival time in post-PD. CONCLUSIONS： The tumor has a higher chance of venous invasion if preoperative imagings indicate that it juxtaposes with the vessel. Lumbodorsal pain is the chief complaint. Pa- tients with pancreatic cancer associated with PV involvement should receive PDVR for R0 resection when preoperational assessment shows the chance for eradication.

Factors associated with metastasis in superior mesenteric vein lymph node in subtotal gastrectomy for gastric cancer:Retrospective case control study

Objective: The revised Japanese treatment guideline for gastric cancer recommends dissection of the superior mesenteric vein lymph node(No. 14v LN) if there is metastasis in infrapyloric lymph node(No. 6 LN). However,it is still controversial whether LN dissection is necessary. The aim of this study was to investigate the factors associated with metastasis in No. 14v LN.Methods: Patients who underwent D2 lymphadenectomy between 2003 and 2010 were included. We excluded patients who underwent total gastrectomy, had multiple lesions, or had missing data about the status of metastasis in the LNs that were included in D2 lymphadenectomy. Clinicopathologic characteristics and the metastasis in regional LNs were compared between patients with No. 14v LN metastasis(14v+) and those without(14v-).Results: Five hundred sixty patients were included in this study. Univariate analysis showed that old age, larger tumor size, tumor location, differentiation, lymphatic invasion, venous invasion, perineural invasion, T classification, and N classification were related to metastasis in No. 14v LN. Multivariate analysis showed differentiation(P=0.027) and N classification(P<0.001) were independent related factors. Metastasis in infrapyloric lymph node(No. 6 LN) and proxiaml splenic lymph node(No. 11p LN) was independently associated with metastasis in No. 14v LN.Conclusions: Differentiation and N classification were independent factors associated with No. 14v LN metastasis, and No. 6 and No. 11p LN metastasis were independent risk factors for No. 14v LN metastasis.

Small Bowel Stricture Complicating Superior Mesenteric Vein Thrombosis

Superior mesenteric vein (SMV) thrombosis is a relatively rare disease.Most patients may be successfully treated with anti-coagulation alone.However,bowel stricture may develop due to intes-tinal ischemia which may require surgical treatment.This report describes a rare case of small bowel stricture occurring one month after successful treatment of SMV thrombosis.After segmental resection of strictured bowel,the patient’s post-operative course was uneventful.

Pancreatectomy combined with superior mesenteric-portal vein resection: report of 32 cases

BACKGROUND: Resection of the superior mesenteric- portal vein (SMPV) during pancreatoduodenectomy is dis- puted. Although the morbidity and mortality of patients af- ter this operation are acceptable, survival is limited. In this study, we evaluated the morbidity, mortality and survival of patients with ductal adenocarcinoma of the pancreas who had undergone pancreatectomy with en bloc portal vein re- section. METHODS: A total of 32 patients with ductal adenocarci- noma of the pancreas who had undergone pancreatectomy with SMPV resection between 1999 and 2003 were retro- spectively analyzed. In addition, they were categorized in- to two groups according to the invasion of the wall of the portal vein: group A (n =12), extended compression of the wall of the portal vein by surrounding carcinoma without true invasion and group B (n =20), true invasion including intramural and transmural invasion. RESULTS; The morbidity of the 32 patients was 31.25%. There was no operative death, and the overall 1-,3-year survival rates were 59% and 16%, respectively. The mean survival time of patients with microscopically positive mar- gin was only 5. 6 months as compared with 20 months in patients with microscopically negative margin. No diffe- rences in tumor size, margin positivity, nodal positivity, and 1-, 3-year survival rates were observed between the two groups. CONCLUSIONS; If selected carefully, pancreatectomy combined with SMPV resection can be performed safely, without increase in the morbidity and mortality. SMPV re- section should be performed only when a margin-negative resection is expected to be achieved. SMPV invasion is notassociated with histologic parameters suggesting a poor prognosis.

Ligamentum teres hepatis as a graft for portal and/or superior mesenteric vein reconstruction:From bench to bedside

BACKGROUND Pancreaticoduodenectomy combined with portal vein(PV)and/or superior mesenteric vein(SMV)resection in patients with pancreaticobiliary malignancy has become a common surgical procedure.There are various grafts currently used for PV and/or SMV reconstruction,but each of these grafts have certain limitations.Therefore,it is necessary to explore novel grafts that have an extensive resource pool,are low cost with good clinical application,and are without immune response rejection or additional damage to patients.AIM To observe the anatomical and histological characteristics of the ligamentum teres hepatis(LTH)and evaluate PV/SMV reconstruction using an autologous LTH graft in pancreaticobiliary malignancy patients.METHODS In 107 patients,the post-dilated length and diameter in resected LTH specimens were measured.The general structure of the LTH specimens was observed by hematoxylin and eosin(HE)staining.Collagen fibers(CFs),elastic fibers(EFs),and smooth muscle(SM)were visualized by Verhoeff-Van Gieson staining,and the expression of CD34,factor VIII-related antigen(FVIIIAg),endothelial nitric oxide synthase(eNOS),and tissue type plasminogen activator(t-PA)were detected using immunohistochemistry in LTH and PV(control)endothelial cells.PV and/or SMV reconstruction using the autologous LTH was conducted in 26 patients with pancreaticobiliary malignancies,and the outcomes were retrospectively analyzed.RESULTS The post-dilated length of LTH was 9.67±1.43 cm,and the diameter at a pressure of 30 cm H2O was 12.82±1.32 mm at the cranial end and 7.06±1.88 mm at the caudal end.Residual cavities with smooth tunica intima covered by endothelial cells were found in HE-stained LTH specimens.The relative amounts of EFs,CFs and SM in the LTH were similar to those in the PV[EF(%):11.23±3.40 vs 11.57±2.80,P=0.62;CF(%):33.51±7.71 vs 32.11±4.82,P=0.33;SM(%):15.61±5.26 vs 16.74±4.83,P=0.32].CD34,FVIIIAg,eNOS,and t-PA were expressed in both LTH and PV endothelial cells.The PV and/or SMV reconstructions were successfully completed in all patients.The overall morbidity and mortality rates were 38.46%and 7.69%,respectively.There were no graft-related complications.The postoperative vein stenosis rates at 2 wk,1 mo,3 mo and 1 year were 7.69%,11.54%,15.38%and 19.23%,respectively.In all 5 patients affected,the degree of vascular stenosis was less than half of the reconstructed vein lumen diameter(mild stenosis),and the vessels remained patent.CONCLUSION The anatomical and histological characteristics of LTH were similar to the PV and SMV.As such,the LTH can be used as an autologous graft for PV and/or SMV reconstruction in pancreaticobiliary malignancy patients who require PV and/or SMV resection.

Resection of the main trunk of the superior mesenteric vein without reconstruction during surgery for giant pancreatic mucinous cystadenoma:A case report

Pancreatic tumors, with peri-pancreatic main vascular invasion, especially the superior mesenteric vein(SMV) or the portal vein, are very common. In some cases, vascular resection and reconstruction are required for complete resection of pancreatic tumors. However, the optimum surgical method for venous management is controversial. Resection of the SMV without reconstruction during surgery for pancreatic tumors is rarely reported. Here we present the case of a 58-year-old woman with a giant pancreatic mucinous cystadenoma adhering to the SMV, who underwent an en bloc tumor resection, including the main trunk of the SMV and the spleen. No venous reconstruction was performed during surgery. No ischemic changes occurred in the bowel. The presence of several welldeveloped collateral vessels was shown by 3-dimensional computed tomography examination. The patient had an uneventful postoperative period and was discharged. This case indicated that the main trunk of the SMV can be resected without venous reconstruction if adequate collateralization has formed.

Devascularization of the superior mesenteric vein without reconstruction during surgery for retroperitoneal liposarcoma: A case report and review of literature

A 61-year-old female patient with chronic hepatitis B virus infection was diagnosed with liposarcoma in a community hospital. Fine needle aspiration biopsy confirmed the diagnosis of well-differentiated liposarcoma. Abdominal computed tomographic angiography(CTA) showed that the mass adhered to and constricted the main trunk and branch of the superior mesenteric vein(SMV), especially the ileocolic vein, and collateral circulation was observed during the vascular reconstruction scan. The abdominal liposarcoma was resected. Because of the collateral circulation, devascularization of the SMV was attempted, and we resected the eroded SMV. The condition of the blood vessels was evaluated 20 d after surgery using CTA, which showed that the SMV had disappeared. Significant improvements in SMV collateral circulation and the inferior mesenteric vein were observed after vascular reconstruction. The patient had an uneventful postoperative course except for transient gastroplegia. Twenty months after surgery, the patient had a recurrence of liposarcoma. She underwent tumor resection to remove the distal small intestine and right hemicolon. We learned that(1) direct devascularization of the main SMV trunkwithout a vein graft is possible. The presence of collateralcirculation can increase the success rate of patientsundergoing radical surgery and prevent the occurrence ofserious postoperative complications. In addition,(2) thiscase demonstrated the clinical value of 3 D reconstruction.

Pancreaticoduodenectomy with combined superior mesenteric vein resection without reconstruction is possible:A case report and review of the literature

We report the case of a 56-year-old woman with pancreatic adenocarcinoma(PA) discovered during an episode of febrile jaundice. A computed tomography(CT) scan showed a mass in the head of the pancreas with circumferential infiltration of the superior mesenteric vein(SMV) and dilatation of the biliary and pancreatic ducts without metastases. The patient benefited from neoadjuvant chemotherapy(FOLFIRINOX) followed by radio-chemotherapy(45 Gy) and chemotherapy(LV5 FU2). The revaluation CT revealed SMV thrombosis without portal vein(PV) thrombosis. There was no contact of the tumor with the PV. Pancreatoduodenectomy with combined resection of the SMV was performed with no reconstruction of this venous axis after confirmation of adequate PV, splenic, and left gastric venous flow and the absence of bowel ischemia. The pathological diagnosis was p T4 N1 R0 PA. There were no bowel angina issues during the follow-up period. At 15 mo after surgery, the patient died of metastatic recurrence.

A Rare Case of Superior Mesenteric Vein Aneurysm Secondary to Portal Hypertension

Venous aneurysms are less common than arterial aneurysms in clinical practice, and the occurrence of such cases is a topic for publication. Aneurysms of the superior mesenteric vein (SMV) are rare, and their origin is unknown. Many aneurysms are asymptomatic, and the diagnosis is established from radiologic findings. Others are diagnosed after complications such as gastrointestinal bleeding or thrombosis with associated abdominal pain. Because of the rarity of this disease, therapy must be adapted to fit each case. A 55-year-old woman presented with pain in abdomen since 2 months. The diagnosis of this anomaly was made after Computed tomography (CT) scans, that demonstrated a mass. Apart from various etiological theories, portal hypertension was more likely cause of her SMV aneurysm. Case was treated by medical treatment like Sorbitrate, Propranolol, Omeprazole and Lasix. No aneurysm growth or complication was observed even after 2 years of follow-up.

Isolated Superior Mesenteric Vein Thrombosis in Acute Pancreatitis: A Case Report

The most common vascular complication of acute pancreatitis is thrombosis of the splenic vein. Isolated thrombosis of the superior mesenteric vein is rare and may lead to mesenteric ischemia and bowel infarction. We report the case of a 39 years old patient received for acute pancreatitis with a Ranson score less than 3 and image scanner for a grade C of Balthazar and a superior mesenteric vein thrombosis. The outcome was favorable with improvement of symptoms under medical treatment including anti-coagulant therapy. The contrast enhancing abdominal CT showed an absence of superior mesenteric thrombosis.

Isolated varices over hepatic flexure colon indicating superior mesenteric venous thrombosis caused by uncinate pancreatic head cancer - a case report

Very rare cases of varices involving right side colon were reported. Most of them were due to cirrhotic portal hypertension or other primary causes. No report case contributed to pancreatic cancer. Here, we reported a case of uncinate pancreatic cancer with the initial finding of isolated hepatic flexure colon varices. Following studies confirmed isolated varices involving hepatic flexure colon due to pancreatic cancer with occlusion of superior mesenteric vein. From this report, superior mesenteric vein occlusion caused by uncinate pancreatic head cancer should be considered as a differential diagnosis of colon varices.

后侧进路PV-SMV预置阻断法胰钩突部癌切除术

目的 探讨胰钩突部癌手术切除的可行性及安全性。方法 7例胰钩突部癌采用胰头后侧进路、预置PV-SMV阻断法手术切除。结果 胰头十二指肠根治性切除4例,合并SMV部分切除3例,无手术死亡及相关并发症,中位生存时间18.1个月。结论 胰钩突部癌采用胰头后侧进路手术有助于提高切除率和减少局部复发。

胰头区病变伴肠系膜上静脉(SMV)受侵的MRI鉴别诊断

目的探索胰头周围区病变累及肠系膜上静脉(SMV)的MR影像表现。方法回顾分析证实的胰头及邻近区域病变72例MRI。男39例、女33例,19—87岁,平均58．5岁。分析SMV受侵与否的MRI表现,对照病理结果、进行评价讨论。结果SMV受累包括:管腔变形、狭窄、异常扩张等。恶性肿瘤组(30例)SMV受侵占93．3％(28／30),良性病变中59．9％未受累(27／42)。以SMV明显受侵为恶性病变,具弱相关性(P<0．05),其敏感性、特异性和定性诊断正确率各为62．2％(28／45)、92．6％(25／27)和73．6％(53／72)。结论MRI易于显示SMV受侵,有助于胰头区病变良恶性的鉴别诊断。

Acute extensive portal and mesenteric venous thrombosis after splenectomy:Treated by interventional thrombolysis with transjugular approach

AIM:To present a series of cases with symptomatic acute extensive portal vein(PV)and superior mesenteric vein(SMV)thrombosis after splenectomy treated by transjugular intrahepatic approach catheter-directed thrombolysis. METHODS:A total of 6 patients with acute extensive PV-SMV thrombosis after splenectomy were treated by transjugular approach catheter-directed thrombolysis. The mean age of the patients was 41.2 years.After access to the portal system via the transjugular approach,pigtail catheter fragmentation of clots, local urokinase injection,and manual aspiration thrombectomy were used for the initial treatment of PV-SMV thrombosis,followed by continuous thrombolytic therapy via an indwelling infusion catheter in the SMV,which was performed for three to six days. Adequate anticoagulation was given during treatment, throughout hospitalization,and after discharge. RESULTS:Technical success was achieved in all 6 patients.Clinical improvement was seen in these patients within 12-24 h of the procedure.No complications were observed.The 6 patients were discharged 6-14 d(8±2.5 d)after admission.The mean duration of follow-up after hospital discharge was 40±16.5 mo.Ultrasound and contrast-enhanced computed tomography confirmed patency of the PV and SMV,and no recurrent episodes of PV-SMV thrombosis developed during the follow-up period. CONCLUSION:Catheter-directed thrombolysis via transjugular intrahepatic access is a safe and effective therapy for the management of patients with symptomatic acute extensive PV-SMV thrombosis.

多层螺旋CT研究SpV和SMV血流在门静脉内和肝内的分布规律

目的 探讨多层螺旋CT研究Sp V和SMV血流在门静脉内和肝内的分布规律的研究。方法 本实验所选取的研究对象为我院从2013年2月~2014年6月接诊的125例患者,对患者的上腹部进行多层螺旋CT平扫和增强扫描,观察患者的门静脉主干（MPV）内Sp V和SMV的血流分布的情况。分别测量患者在平扫和增强检查后动脉期门静脉左支（LPV）和动脉期门静脉右支（RPV）、肝脏的左叶和肝脏的右叶的CT值,分析患者的门静脉内和肝脏内Sp V和SMV的血流的分布规律。结果 有81例（64.80%）患者的门静脉主干内Sp V和SMV血流的分布为分层分布（A组）,有32例（25.60%）患者为螺旋形分布（B组）,其余12例（9.60%）患者为紊乱分布（C组）;患者进行平扫时,门静脉内和肝内的左支与右支的血流分布无统计学意义（P〉0.05）;患者进行增强动脉扫描时,门静脉内和肝内的左支的血流分布显著高于右支的血流分布（P〈0.05）;其中有105例的患者的Sp V血液是先进入患者门静脉左支,然后再流向患肝脏的左叶,SMV血液是先进入患者门静脉右支,然后再流向患者肝脏的右叶。结论 患者的Sp V和SMV血流是以分层分布、螺旋形分布、紊乱分布三种分布形式存在于门静脉内和肝脏内,有多数患者的Sp V血液是通过患者门静脉左支进入患者肝脏的左叶,SMV血液是通过患者门静脉右支进入患者肝脏的右叶。

急性肠系膜缺血血管内治疗的研究进展

虽然急性肠系膜缺血(AMI)的发生率较低,但其致死率较高。AMI的常见分型包括急性肠系膜上动脉栓塞、急性肠系膜上动脉血栓形成和急性肠系膜静脉血栓形成。目前,血管内治疗是AMI的有效治疗策略之一,针对不同类型的AMI可选择不同的血管内治疗方式,包括血管内机械取栓、动脉内置管溶栓及联合策略。本文针对近些年AMI血管内治疗的相关进展进行综述,并分析存在的问题。

腹腔镜下右半结肠癌根治术中以不同血管为导向的对比

目的探讨对比以肠系膜上动脉(SMA)为导向和肠系膜上静脉(SMV)为导向的腹腔镜下右半结肠癌根治术的临床疗效与短期预后对比。方法选取2020年1月至2022年10月收治的80例cT2-4和(或)N0-2M0的右半结肠癌患者作为研究对象,将其随机分为观察组和对照组,各40例。观察组采用以SMA为导向的腹腔镜下右半结肠癌根治术治疗,对照组采用以SMV为导向的腹腔镜下右半结肠癌根治术治疗,对比两组疗效及预后。结果两组发病的一般情况、手术时间、留置胃管时间、恢复排气时间、术后禁食时间、术后放置引流时间、术后营养指标、并发症总发生率及术后住院时间等差异无统计学意义(P>0.05);观察组清扫到的淋巴结明显多于对照组,差异有统计学意义(P<0.05),其中观察组送检SMA前方及左侧淋巴结(No.D3),检出淋巴结数量249枚,确诊D3转移的患者7例(17.5%),阳性淋巴结13枚(5.2%)。结论以SMA为导向的腹腔镜下右半结肠癌根治术在未增加并发症发生率且安全性高的同时,更彻底地清扫淋巴结,减少肿瘤复发,有望显著改善患者预后。