[Abstract]  Objective  To investigate the effect of surgical and endoscopic treatment on the prognosis of elderly patients with cT1N0M0 esophageal cancer.MethodsThe Surveillance，Epidemiology，and End Results（SEER）database was queried to identify elderly patients（≥75 years）with cT1N0M0 esophageal cancer from 2004 to 2015.The enrolled patients were divided into two groups：esophagectomy（group ES）and endos  copic therapy（group ET） group.Fiveyear overall survival（OS）and cancerspecific survival（CSS）were compared using the life table method，KaplanMeier method was used to draw the survival curve.Multivariate Cox proportional hazards model was used to assess the importance of various covariates.ResultsData from 471 esophageal cancer patients（group ET：n=257，54.6%；group ES：n=214，45.4%）were included.There was an increase  in the proportion of patients who underwent ET from the year of 2004～2009（47.8%）to 2010～2015（60.8%），while ES decreased from 52.2% to 39.2%（both P＜0.05）.There was also an increase in 5year OS（27.4% VS 52.0%，P＜0.05）and CSS（58.1% VS 78.6%，P＜0.05）between the two time intervals.The 5year OS of ES and ET groups were 26.0% VS 38.2%（P＞0.05），while CSS were 65.0% VS 61.9%（P＞0.05）.Multivariate Cox regression analysis showed that esophageal cancer patients who underwent ES did not improve 5year OS（HR：0.763，95%CI：0.573～1.018，P＞0.05）or CSS（HR：0.991，95%CI：0.648～1.516，P＞0.05）compared with those who underwent ET.Conclusion  Endoscopic treatment of esophageal cancer patients with early cT1N0M0 in the elderly is feasible and does not affect 5year OS and CSS in such patients.

[Abstract]objective  Retrospective analysis of prognosis，recurrence and metastasis after treatment of significance and operation assisted radical postoperative stage pT1 squamous cell carcinoma of thoracic esophagus.Methods  131 cases of stage pT1 thoracic esophageal cancer which were diagnosized and treated with radical resection.SPSS 21.0 statistical software was used to statistical analysis.Results The end of followup was January，2018.During the followup period，34 （25.95%）patients died，27 died from the tumor itself，and 7 died from other causes.28 cases （21.4%）was local recurrence and/or distant metastasis，which including 15 cases （11.45%）of local regional recurrence，9 cases （6.87%）of distant metastasis and 4 cases （3.05%）of local regional recurrence combination of distant metastasis.The 1，3，5year overall survival（OS）rates were 96.9％，90.8％，86.3％，respectively；the 1，3，5year rates of progression free survival（PFS）were 80.2％，71.0％，69.5％，respectively.Univariate analysis showed lymphatic metastasis，vascular invasion，depth of invasion and drinking were the independent risk factors for local recurrence and （or）distant metastasis in patients with pT1 esophageal squamous carcinoma（P<0.05），with multivariate analysis，vascular invasion and drinking were the independent risk factors for local recurrence and （or）distant metastasis in patients with pT1 esophageal squamous carcinoma（P<0.05）.The KaplanMeier method remind lymphatic metastasis，vascular invasion，drinking and tumor size（＞2.0cm）were the independent risk factors for OS and PFS（P<0.05）；COX’S regression model remind vascular invasion，drinking，tumor size（＞2.0cm），differentiation degree and tumor length were the 〖LM〗independent risk factors for OS and PFS（P<0.05）.Conclusion For patients of stage pT1 squamous cell carcinoma of thoracic esophagus after radical resection，there were still 21.4% of patients with local recurrence and/or distant metastasis.Postoperative pathology indicated that the tumor length >2.0cm，lymph node metastasis，infiltration depth of the submucosa，differentiation degree，the vascular invasion and drinking patients were associated with treatment failure.This group of patients should develop more intensive followup strategies after surgery，and appropriate postoperative adjuvant treatment may help reduce the risk of recurrence and improve prognosis after surgery.

[Abstract]  Objective  To investigate the feasibility and efficacy of transorally inserted anvil （OrVil）in the surgical treatment of cervical and upper thoracic esophageal cancer  Methods  Reviewed 29 cases of cervical and upper thoracic esophageal cancers with OrVil esophagealgastric nearpharyngeal anastomosis.12 cervical esophageal cancers，17 upper thoracic esophageal cancers.Preoperative gastroscopy suggested that the upper margin of the tumor was 20（1723）cm from the median of the incisors.1 case was performed with detachment of esophagus without thoracotomy and 28 cases were threated by Mckeown.All patients underwent single or bilateral selective cervical lymphadenectomy.Results  Postoperative pathology was squamous cell carcinoma，R0 resection rate was 100%.2（6.9%）cases of postoperative anastomotic fistula，2 （6.9%）cases of pulmonary infectiont，5（17.2%）cases of hoarseness，8（27.6%）cases of drinking water cough.The median time for oral feeding was 10 （7～22）days.No perioperative death.During the 3～36 months followup，3 cases were recovered from hoarseness，drinking water cough was improved，anastomotic stenosis occurred in 1 case （3.4%），tumor recurrence rate was 17.2% （5/29），mortality was 6.9% （2/29）.Conclusion  Gastroesophageal anastomosis close to the pharynx by using the technique of OrVil in cervical and upper thoracic esophageal cancer can improve laryngeal preservation and R0 resection rate，it is safe and feasible，recent result was satisfactory.

[Abstract] Objective   To explore the experience and value of stratified suture combined with pedicle greater omentum transplantation in the repair of benign rupture of esophagus.Methods〖 The clinical data of 37 patients with benign rupture of esophagus with pedicled omentum were analyzed.Spontaneous esophageal rupture in 30 cases，esophageal foreign body and perforation in 7 cases.The average duration of surgery was 45 hours.The break length averaged 4.8cm.All cases were repaired by stratified suture and pedicled omentum embedding.Results37 patients were hospitalized on an average of 23.2d after operation，1 cases had fistula after operation，all the remaining cases healed well，followed up for 6～24 months，no tardive fistula and stricture of the esophagus.Conclusion  For patients with esophageal perforation or spontaneous esophageal rupture，if intrathoracic infection or esophageal edema were founded，we recommend stratified suture combined with pedicle greater omentum transplantation.

[Abstract]  Objective  To analyze the effect of potential factors on the risk of respiratory failure after minimally invasive surgery for videoassisted thoracoscopic esophageal cancer.Methods   A total of 55 patients with respiratory failure after minimally invasive surgery for thoracic esophageal cancer were enrolled in the respiratory failure group.95 patients with no respiratory failure were included in the control group.The effects of gender，smoking，preoperative lung function（including MVV% and FEV1%），preoperative pulmonary comorbidities，preoperative hypoproteinemia，and operative time on the risk of respiratory failure were discussed.Statistical analysis data were performed using SPSS software，and single factor and multivariate logistic regression were used to analyze risk factors for respiratory failure after esophageal cancer surgery.Results   Univariate analysis showed that advanced age（≥70 years），smoking，preoperative pulmonary complication，operative time > 3h，postoperative anastomotic leakage，and chylothorax may be risk factors for respiratory failure.Preoperative maximum ventilation（MVV%）of group respiratory failure was 51.02±7.69 and the first second forced expiratory volume（FEV1%） was 39.05±6.47，which were lower than the control group（85.64±8.10，74.29±7.28，respectively，P<0.05）.Logistic multivariate regression analysis showed that age ≥ 70，operation time > 3h，low preoperative lung function and postoperative anastomotic fistula and chylothorax（B values of 1.313，1.345、1.489，1.579，1.574，respectively）were ndependent factors of respiratory failure after minimally invasive surgery for videoassisted thoracoscopic esophageal cancer（P<0.05）.Conclusion  Preoperative improvement of lung function，shortening operation time，reducing the incidence of postoperative anastomotic fistula and chylothorax which can help prevent postoperative respiratory failure.

[Abstract]  objective    To analyze the risk factors of anastomotic leakage after treatment of radical esophagectomy for esophageal cancer.Methods  The clinical data of 381 patients with esophageal cancer undergoing radical esophagectomy were analyzed retrospectively.Gender，age，ASA score，previous hypertension，diabetes history，surgical condition，preoperative and postoperative laboratory test results，and other factors that may affect the occurrence of anastomotic leakage after esophageal cancer were selected for univariate analysis.Logistic regression was used to analyze the main risk factors.Results  Thirtyseven patients of 381 cases with esophagectomy occurr ed anastomotic leakage and the incidence rate was 9.7%（37/381）.In univariate analysis，tumor location，surgery type，anastomotic site，smoking，moderately severely COPD，bleeding volume，operating time and the CRP on second day after operation were determined as influence factors.The multivariate analysis showed that anastomotic site，smoking，bleeding volume and the CRP on second day after operation are independent risk factors for anastomotic leakage after esophagectomy.ConclusionAnastomotic site，bleeding volume and smoking are important factors for the anastomotic leakage，and the CRP on second day after operation is a    useful marker of prediction about early anastomotic leakage of esophagectomy.

[Abstract]objective  To explore the surgery therapy for recurrent esophageal cancer patients after radical resection.Methods  The clinical data of 18 recurrent esophageal cancer patients who underwent radical resection were retrospectively reviewed.Surgery for recurrent gastric cancer patients achieves ideal longterm prognosis，which should perform actively.Radical resection was performed in 17 cases and palliative resection in 1 cases.Remnant gastricesophago anastomosis through Left oblique thoracoabdominal incision in 3 patients； 2 cases were performed ofesophageal RouxenY anastomosis and 1 case was performed coloesophago anastomosis through Left oblique thoracoabdominal incision； 12 cases were performed esophagectomy and coloesophago anastomosis through the threeincision （right thoracotomy，midline laparotomy and left cervical incisions）.Esophagectomy and alimentary canal reconstruction were performed in 13 patients at the same time.5 patients were treated with colonic esophageal substitution and selective operation for thenesophagectomy.Results  The inhospital postoperative mortality was 0.Pulmonary complications were most commonly observed complications among 4 patients； cervical Esophagocolo anastomosis site leakage developed in 1 patient； abdominal incision infection in 1 patient，all were cured after treatment.All patients were followed up，the palliative resected patients died 13 months after the operation.Conclusion  For patients with limited recurrence of esophageal cancer，if the patient's constitution allows，we have master surgical indications，taking active reoperation can prolong the patient's survival time.

[Abstract] Objective  To investigate the application of videoassisted thoracoscopic（VATS）esophageal replacement with colon（ERC）for  carcinoma.Methods  100 cases of esophageal carcinoma treated with surgery.The patients was randomly divided into two groups.Group A（n=49）underwent thoracoscopic esophageal replacement with colon.Group B（n=51）underwent videoassisted thoracoscopic esophageal replacement with colon.The mortality and incidence of complications such as anastomotic fistula，colonicischemia，necrosis，respiratory failure were compared.Results  The incidence of respiratory failure caused by postoperative infection in group B（0.02%）was lower than that in group A（16.3%）（P<0.05）.There was no significant difference in anastomotic fistula（3.9% vs 12.2%），ischemic necrosis of colon（0.02% vs 6.12%）and intestinal obstruction（0.02% vs 4.1%）between group B and group A（P>0.05）.The rate of postoperative complications（13.7% vs 40.8%）and mortality（5.9% vs 20.4%）between group B were lower than those in group A（P<0.05）.Conclusion The total complication rate and mortality rate of esophagus replacementwith colon under thoracoscopy are significantly reduced.

[Abstract] Objective     To investigate the feasibility and safety of endoscopic and Xray placement of stenting in treatment of advanced esophageal and cardiac cancer.Methods   80 patients with advanced esophageal and cardiac cancer who underwent esophageal stent were selected as study subjects.They were divided into treatment group and control group according to the random numbers table（40 in each）.The treatment group was given endoscopic stenting under direct vision，and the control group was given stenting under Xray fluoroscopy.The clinical efficacy and postoperative complications were observed and compared between the two groups.Results  The stents were placed once in both groups.29 covered stents and 11 stentless stents were were stented in the treatment group.32 stented stents and 8 stentless stents were placed in the control group.The success rate of stent placement in both groups was 100%，and the stent placement was accurate and with good expansion.9 patients with esophageal bronchial spasm were tightly sealed.After 2 weeks of treatment，the total effective rate was 90.00% in the treatment group and 85.00% in the control group.The difference was not statistically significant （P>0.05）.Compared with before treatment，the Scooler grading of the two groups was significantly improved after two weeks treatment.There was no significant difference between the two groups（P>0.05）.The incidence of postoperative chest pain and hemorrhage was 100% in both groups，and after alleviation of acid and hemostasis，they all eased in about 1 week.There was no significant difference in the incidence of postoperative complications between the two groups（P>0.05）.Conclusion  Endoscopic visualization and esophageal stent under Xray fluoroscopy are effective in the treatment of advanced esophageal and cardiac cancers.Endoscopy under direct vision is simple and accurate.A greater degree of stenosis may be considered Xray fluoroscopy.

Objective   To study clinical features of esophageal foreign body in northwestern China to improve the abilities of diagnosis and treatment for the disease.Methods    Clinical data of 202 patients admitted in for esophageal foreign body was analyzed retrospectively.The general information of the patients were collected，and the types of foreign bodies，the location，diagnostic methods，methods of taking out and related complications，hospitalization days，et al were analyzed statistically.Results  The types of esophageal foreign body included jujube pit（61.8  %），animal bones（12.9%）and nonfood foreign bodies such as dentures（9.4%），metals（7.4%）and coins（5.0%）.It mainly occurred in the upper orifice of the esophagus（65.8%）.Diagnostic methods were mainly consisted of esophageal angiography（57.9%），chest Xray（19.8%）and endoscopy（16.4%）.Most of the patients（189，93.6%）were treated with esophagoscopy.Altogether 26 cases presented with complications，and 18 of them were admitted in for jujube pit.Conclusion   The main cause of esophageal foreign body is jujube pit，which the incidence of postoperative complications is higher than other foreign bodies.

[Abstract]〓  bjective  To investigate the postoperative analgesic effect after thoracic surgery by intercostal nerve blockade combined with patientcontrolled intravenous analgesia.Methods  42 patients after thoracotomy were randomly divided into the patientcontrolled intravenous analgesia group（group A）and intercostal nerve block combined patientcontrolled intravenous analgesia group（group B）.The use of intravenous analgesic drug pump was reduced in early postoperative period.All patients were comparatively observed with pain visual analogue scale（visual analogue scale，VAS）in static condition，activity，cough，times of painkillers using and the incidence of adverse reactions.Result The VAS scores in static condition，activity，cough，times of painkillers using in group B[（16.43±0.36），45.5%]was lower than group A[（27. 89±0.45），55.0%]there was statistical difference（P＜0.05）.There was no significant difference between group A（65.0%）and group B（31.8%）with incidence of adverse reactions（P＞0.05）.Conclusion The combination of intercostal nerve blockade and postoperative patientcontrolled intravenous analgesia has a good analgesic effect and safety for postoperative patients after thoracotomy，but can not relieve the adverse reactions such as nausea，vomiting and drowsiness

[Abstract]  Objective To investigate the efficacy of minimally invasive intracranial hematoma puncture and drainage in the treatment of hypertensive intracerebral hemorrhage（HICH）at different operation opportunities and its influence on the serum levels of neuronspecific enolase（NSE），brainderived neurotrophic factor（BDNF）and homocysteine（Hcy）.Methods The clinical data of 200 patients with HICH who treated with minimally invasive intracranial hematoma puncture and drainage were retrospectively analyzed.The patients were divided into four groups according to the time of operation：23 cases as ultraearly group（<6h），52 cases as early group（6～12h），96 cases as midterm group（>12～24h）and 29 cases as delayed group（>24h）.The rate of postoperative rebleeding and the shortterm prognosis were compared among the four groups，the scores of National Institutes of Health Stroke Scale（NIHSS）was evaluated，the changes of serum NSE，BDNF and Hcy levels were determined.Results The complete hematoma clearance rate and good prognosis rate in the ultraearly group and the early group were significantly higher than those in the midterm group and deferred group（P<0.05）.The rebleeding rate in the ultraearly group was significantly higher than that in the other three groups（P<0.05）.After surgery，the serum levels of NSE and Hcy were significantly lower than the midterm and delayed groups，while the BDNF was significantly higher than the two groups（P<0.05）.Conclusion The optimal operation window of minimally invasive intracranial hematoma puncture and drainage for HICH is 12 hours after HICH.The earlier operation is more conducive to gain better clinical prognosis and can protect the cerebral nerve function，its mechanism may be related to the regulation of NSE，BDNF and Hcy levels.

[Abstract] Objective  To investigate the effects and significance of serum amylase，prealbumin （PAB）and albumin （ALB）in the treatment of acute pancreatitis （AP）with amino acid support in ERCP（encoscopic retrograde cholangiopancreatography）.Methods 100 patients with acute pancreatitis diagnosed by ERCP were randomly divided into two groups（n=50）.The control group was given routine surgical treatment.On the basis of this，the treatment group was deal with parenteral amino acid nutrition for 7 days.The serum amylase level was measured at 2h before operation，2h，1d，2d and 7d after operation，and the curative and symptom effect were observed.Results  Compared with the control group，the serum amylase levels，main clinical symptoms，and nutritional status indicators were significantly relieved in the observation group（P<0.05）.Compared with the control group，the total effective rate of the treatment group was significantly increased，the difference was statistically significant（P<0.05）.Conclusion ERCP treatment of acute pancreatitis to give amino acid nutritional support treatment could effectively relieve the clinical symptoms of AP，and reduce the content of serum amylase.

[Abstract]  Objective To study the curative effect，gallbladder，liver function and living quality between cholecystolithotomy with gallbladder reservation by laparoscopy and choledochoscope and laparoscopic cholecystectomy in gallbladder stone patients with colecystolithiasis.Methods 60 patients with gallbladder stone were selected and they were divided into research group（n=30）and control group （n=30）according to different surgical operation way.Research group was treated by laparoscope combined with choledochoscope while control group was treated by totally laparoscope for gallbladderprotected lithotomy.The curative effect and so on were observed in the two groups. Results The curative effect between research group（96.67%）and control group（93.33%）which had no statistically significant difference（P>0.05）.Operation time and removal rate of calculi in research group were obviously longer than that of control group，and blood loss wassignificantly less than that of control group，the difference was statistically significant （P<0.05），but two groups of intestinal peristalsis recovery time 、hospitalization days and postoperative complications had no statistically significant difference （P>0.05）.The fasting gallbladder volume and maximum shrinkage 12 months after operation were better in the research group than those in the control group（P<0.05）.The liver function in two groups had no statistically significant difference before and 1 month after operation（P>0.05）.The living quality in in the research group were higher than the control group 12 month after operation（P<0.05）.Conclusion Choledochoscopeassisted laparoscopic surgery for gallstones is safe and effective for the recovery of gallbladder and liver function，at the same time it can improve the living quality of patients，thus should be widely applied.

  [Abstract] Objective To analyze the clinical application effects of laparoscopy combined with hepatic cholangioscopy under the guidance of threedimensional visualization technology in the treatment of patients with hepatolithiasis.Methods 45 cases of patients with hepatolithiasis admitted were given the threedimensional visualization software for hepatolithiasis to have threedimensional visualization clinical analysis and preoperative planning.And the threedimensional visualization model was taken into the operating room and used to guide the implementation of the 3D laparoscopy combined with hepatic cholangioscopy targeted lithotripsy.The intraoperative display situation of the threedimensional visualization model and its consistency with the actual distribution of hepatolithiasis were evaluated，and the operative time，intraoperative blood loss，blood transfusion，stone clearance rate，the incidence rates of complications and perioperative mortality rate were recorded，and the stones recurrence rate was measured at postoperative review.Results The liver，intrahepatic vasculature anatomy structures and hepatolithiasis distribution could be truly  represented in a stereoscopic way by threedimensional visualization image model，and the actual intraoperative display was identical with preoperative threedimensional visualization model，and the surgical approaches were consistent with the preoperative planning.The operative time was （125.9±21.2）min，and intraoperative blood loss was （38.8±8.5）mL，and there was no intraoperative massive haemorrhage and transfusion cases.The stone clearance rate was 100% confirmed by MRCP.There were 2 cases of bile duct injury and 1 case of bile leakage，and they were recovered after symptomatic treatment，and the incidence rate of complications was 6.7%.There was no perioperative deaths.There were 2 cases of stone recurrence with the recurrence rate of 4.4%.Conclusion Threedimensional visualization technology can have accurate preoperative evaluation of hepatolithiasis，and guide the lithotripsy，stone removal and hepatic resection by intraoperative laparoscopy and hepatic cholangioscopy，which can help improve the stone clearance rate and ensure the safety of the operation.

[Abstract] Objective To investigate the therapeutic effect of minimally invasive transforaminal interbody fusion（MISTLIF）in the treatment of single segment lumbar degenerative disease.Methods  The data of 82 patients with single segment lumbar degeneration disease were divided into two groups：group A（n=40）were treated by minimally invasive transforaminal interbody fusion （MISTLIF），group B（n=42）were treated by open intervertebral foramen interbody fusion （OpenTLIF）.Compared the efficacy of the two surgical methods.Results Operation time of group A was （141.3±10.8）minutes，intraoperative fluoroscopy was （12.0±1.5），while the data of group B were （118.5±10.3）minutes and （4.0±1.0），respectively（both P＜0.05）.In group A，intraoperative blood loss was （127.5±1.3）ml，postoperative drainage was （95.8±3.1）ml，postoperative bed time was （28.0±1.5）hours，postoperative hospital stay was （120.0±2.4）hours and the number of cases without serious complications.The data of group B were （320.5±1.2）ml，（72.0±3.2），（144.0±2.1）hours，，respectively.Severe complication was happened in 2 cases.There were statistical significance between the two groups（P＜0.05）.Waist pain VAS scores of 7 days and 3 months after surgery of group A were （2.0±0.5）and （3.1±0.4），respectively.While the data of group B were （3.5±0.5）and （2.0±0.5），respectively.There were statistical significance between the two groups（P＜0.05）.After 18 months of evaluation results in group A without translocation and sinking of fusion and internal fixation failure，Ⅰ level and Ⅱ level fusion were 29 cases（72.5%） and 11 cases（27.5%），respectively.group B fusion shift happeded in 2 cases，no sink fusion and internal fixation failure patients，Ⅰ level and Ⅱ level fusion were 26 cases （61.9%）and 16 cases（38.1%），respectively.Conclusion  The MISTLIF method in the treatment of lumbar vertebra degeneration disease，which patients have lesser trauma，shorter hospitalization，patients can quick recovery after operation.

[Abstract] Objective To investigate the clinical efficacy of posterior 1/3 injured vertebrae corpectomy reconstruction in treatment of thoracolumbar burst fractures and its influence on spinal nerve function.Methods 82 patients with thoracolumbar burst fractures were randomly divided into observation group and control group，with 41 cases in each group.The observation group underwent posterior 1/3 corpectomy reconstruction，decompression and internal fixation，the control group underwent anterior subtotal corpectomy reconstruction，decompression and internal fixation.The surgical conditions，imaging findings，ASIA spinal cord function grading，pain Visual Analogue Scale（VAS）scores and Japanese Orthopaedic Association（JOA）scores  before and after surgery between the two groups were compared.Results The operative time，intraoperative blood loss and postoperative drainage in the observation group were lower than these in the control group，while the bone graft fusion rate was significantly higher than that in the control group（P<0.05）；At final flowup，the JOA score and ASIA grading in the observation group was significantly higher than the control group，while the VAS score，the veaebral height loss and Cobb angle loss were significantly lower than the control group（P<0.05）.The incidence of complications in the observation group was 2.44%，showed no significant difference with 4.88% in the control group（P>0.05）.Conclusion Posterior 1/3 corpectomy reconstruction for thoracolumbar burst fractures can improve the spinal cord nerve function and reduce vertebral correction loss，improve the quality of functional rehabilitation.

[Abstract]  Chylous serous cavity effusion refers to the abnormal accumulation of chylous fluid in the serous cavity，including chylothorax，chyloperitoneum and chylopericardium.The incidence of chylous serous cavity effusion after radical resection of esophageal carcinoma is rare，but it is one of the most important complications affecting the prognosis of patients.The etiology，risk factors，diagnosis and treatment measures of chylous serosal cavity effusion after radical resection of esophageal carcinoma are reviewed in this article.

Radical resection is the main method for the treatment of esophageal cancer and standard and thorough lymph node dissection is closely related to the staging and prognosis of esophageal cancer.da Vinci Surgical System is being widely used as the most advanced technology in the field of minimally invasive surgery.Because of the threedimensional （3D）camera with a magnified view，rotatable arm，and hand-tremor filtration，da Vinci Surgical System is easy to perform high precision and difficult surgical operations in a small space.In recent years，da Vinci Surgical System has been used in esophagectomy.This article is to review its safety and feasibility，dissection of mediastinal lymph nodes，protection of the recurrent laryngeal nerve and learning curve of da Vinci robotassisted minimally invasive esophagectomy （RAMIE）compared to video-assisted minimally invasive esophagectomy.