Mini-invasive Surg 2018;2:22.10.20517/2574-1225.2018.17© The Author(s) 2018.
Open AccessReview

The role of transanal total mesorectal excision in rectal surgery

Cleveland Clinic Florida, Department of Colorectal Surgery, Weston, FL 33331, USA.

Correspondence Address: Dr. Steven D. Wexner, Cleveland Clinic Florida, Department of Colorectal Surgery, 2950 Cleveland Clinic Blvd., Weston, FL 33331, USA. E-mail:

    This article belongs to the Special Issue A Bespoke Approach to Rectal Cancer Resection and Management
    Science Editor: Gordon N. Buchanan | Copy Editor: Jun-Yao Li | Production Editor: Huan-Liang Wu

    © The Author(s) 2018. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License (, which permits unrestricted use, sharing, adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.


    Transanal total mesorectal excision (TaTME) is the newest approach for the resection of rectal cancer, according to the principles of TME. The evolution of TaTME started almost 40 years ago and is a combination of several important developments in both micro-endoscopic surgery and transanal surgery. The preliminary clinical data have revealed acceptable TME quality. Clinical trials to determine the long-term oncological results are still in process. In order to master TaTME, the surgeon should be an expert in laparoscopic rectal surgery as well as transanal microsurgery and follow a stepwise training approach. Robotic TaTME using a single-port robotic system is a promising future development.

    Introduction and history

    The evolution of transanal total mesorectal excision (TaTME) began with the introduction of TME by Heald et al.[1]. In 1982, they showed a reduction in the local recurrence rate from 40% to < 10% by employing TME. Components of TME include a complete or near complete rather than an incomplete mesorectal specimen, tumor-free circumferential resection margins (CRM), a tumor-free distal resection margin (DRM), and the assessment of ≥ 12 lymph nodes. Initially, the operation was done in an open, trans-abdominal approach. In 1991, Marks et al.[2] presented the transabdominal-transanal (TATA) approach to low rectal cancer. Dr. Marks’ rationale was that the transanal approach allows the surgeon to achieve distal resection margins under direct visualization and facilitates distal dissection[2]. The next step in the evolution of TaTME was the introduction of transanal endoscopic surgery (TEM). In 1992, Buess et al.[3] presented their experience with TEM, which utilizes a 40-mm operating rectoscope sealed with an airtight face piece. Carbon dioxide is constantly infused, thereby distending the rectum and maintaining visibility. A variety of operating instruments can be inserted through the face piece to resect adenomas and selected early carcinomas of the mid and upper rectum[3]. In 2010, Sylla et al.[4] presented the first case of TaTME using TEM and laparoscopy that had been performed in a 76-year-old patient with a T2N2 rectal cancer treated with preoperative chemoradiation. The specimen was transanally transected followed by a hand sewn coloanal anastomosis. TEM was not widely adopted due to its high costs, technical complexity and the long learning curve. However, Maya et al.[5] showed by Cussum analysis that the learning curve for TEM is associated with a significant decrease in operative time after only four cases.

    Atallah et al.[6,7] presented the use of transanal single port laparoscopy through the anal canal (transanal minimally invasive surgery; TAMIS). A single-incision laparoscopic surgery port was introduced into the anal canal to gain endoscopic access to the rectum, pneumorectum was established, and transanal excision was performed using laparoscopic instruments.

    TaTME combines the TAMIS and trans-abdominal approaches in order to achieve TME. Several potential advantages have been postulated. Atallah was the first to describe this combination of techniques including a detailed video and the results of the 20 first cases[8,9]. Rectal distention with CO2 combined with magnified optics permits excellent visualization of tissue planes. Easier access to the low rectum may aid the surgeon with better quality TME and precise selection of the distal resection margin under direct visualization helps ensure an adequate margin. TaTME may potentially be a safer anastomosis by avoiding the multiple stapler firings often required in the abdominal approach and may result in higher rates of sphincter preserving surgery. Finally, the two-team approach can shorten the length of surgery.

    Clinical trials

    Lacy et al.[10] reported a series of 140 patients who underwent TaTME for rectal cancer. The mean operative time was 166 min and there were no conversions or intraoperative complications. Macroscopic quality assessment of the resected specimen was complete in 97.1% and near complete in 2.1%. Thirty-day morbidity was minor (Clavien-Dindo I-II) in 24.2% and major (Clavien-Dindo III-IV) in 10%, and no mortality occurred within the first 30 days. The mean follow-up was 15 months, with a 2.3% local recurrence rate and a 7.6% rate of systemic recurrence.

    De Lacy et al.[11] subsequently reported the pathological results of 186 patients who underwent TaTME for low (37%) or mid (63%) rectal cancer. Mesorectal resection quality was complete in 95.7%, near complete in 1.6%, and incomplete in 1.1%. Overall positive CRM and DRM were 8.1% and 3.2%, respectively. The composite of complete mesorectal excision, negative CRM, and negative DRM was achieved in 88.1% of patients.

    Penna et al.[12] reported the short-term clinical and oncological results of the first 720 patients on behalf of the International Registry for TaTME. Seven hundred and twenty consecutive patients from 66 registered units in 23 countries included 634 patients with rectal cancer and 86 with benign pathology. Conversion to open surgery was 6.3% and the mesorectum was complete in 86%, near complete in 11%, and incomplete in 4%. The R1 resection rate was 2.7%. Post-operative morbidity and mortality were 32.6% and 0.5%, respectively. Risk factors for poor specimen (incomplete specimen, perforation, R1 resection) on multivariate analysis were positive CRMs on preoperative MRI and very low rectal tumors (< 2 cm from anal verge).

    Using the same TaTME registry, Penna et al.[13] reported the incidence and risk factors for anastomotic failure in 1594 patients who underwent TaTME, 96.6% of which were performed for cancer and the rest for benign pathology. The overall anastomotic failure rate was 15.7% including early leak (7.8%), delayed leak (2.0%), pelvic abscess (4.7%), anastomotic fistula (0.8%), chronic sinus (0.9%), and anastomotic stricture (3.6%). Independent risk factors of anastomotic failure were male sex, obesity, smoking, diabetes mellitus, tumors > 25 mm, excessive intraoperative blood loss, manual anastomosis, and prolonged operative time.

    Koedam et al.[14] assessed the patient-reported quality of life of 30 consecutive patients who underwent TaTME for rectal cancer. Quality of life was assessed by three questionnaires: Overall Quality of Life (EQ-5D-3L), Colorectal Cancer Specific Quality of Life (EORTC: QLQ-C30 and QLQ-CR29) and Anterior Resection Syndrome (LARS) scale. Outcomes of the questionnaires at 1 and 6 months were compared with preoperative (baseline) values. Deterioration for all domains was mainly observed at 1 month after surgery compared to baseline, but most outcomes had returned to baseline at 6 months. Social function and anal pain remained significantly worse at 6 months compared to baseline. Major LARS (score > 30) was 33% at 6 months after ileostomy closure. End colostomies were not required in any patients. The authors concluded that TaTME is associated with acceptable quality of life and functional outcome at 6 months after surgery comparable to published results after conventional laparoscopic low anterior resection.

    Marks et al.[15] reported the long-term outcomes of 373 patients with rectal cancer underwent TaTME. Ninety six percent of TME specimens were complete/near complete, 94% had a negative circumferential resection margin, and 98.6% had a negative distal margin. Perioperative morbidity and mortality rates were 13.4% and 0.3%, respectively. The median follow up was 5.5 years. Overall local recurrence, distal metastasis, and 5-year survival was 7.4%, 19.5%, and 90%, respectively.

    In a case matched study that included 300 patients, Perdawood et al.[16] compared TaTME (n = 100), laparoscopic TME (LaTME; n = 100), and open TME (OpTME; n = 100). The authors reported that TME resulted in lower rates of incomplete TME specimens than LaTME, but not OpTME (P = 0.016, P = 0.750, respectively). The rates of CRM involvement, mean CRM distance, and the percentages of successful surgery were comparable among the three groups (P = 0.368). The conversion to open surgery occurred only in the LaTME group. TaTME resulted in shorter operation time and less blood loss than the other two groups (P < 0.001 and P < 0.001). Hospital stay was shorter in the TaTME group (P = 0.002); complication rate and mortality were comparable among the groups.

    The COLOR III randomized controlled trial is being conducted to evaluate the role of TaTME in rectal cancer and to assess oncological outcomes. It has been designed to compare short- and long-term outcomes of transanal and laparoscopic TME for mid and low rectal cancer. A total of 1098 consecutive patients scheduled for resection of a mid or low rectal carcinoma will be included. The distal border of the tumor has to be within 10 cm of the anal verge on MRI scan. Exclusion criteria are T1 tumors that can be treated by local excision, tumors with ingrowth in the internal sphincter or levator ani muscle, and all T4 tumors. All participating centers in the COLOR III trial will keep the coordinating center informed of all patients presenting with rectal cancer[17].

    The ETAP-GRECCAR 11 randomized controlled trial is also comparing TaTME to laparoscopic TME. Patients with T3 lower-third rectal adenocarcinomas for whom conservative surgery with manual coloanal anastomosis is planned will be recruited. The study is designed as a non-inferiority trial with a main criterion of R0/R1 resection. The inclusion period will be 3 years, and every patient will be followed for 3 years. The number of patients needed is 226[18].

    The US Multicenter study of TaTME with laparoscopic assistance for rectal cancer is a single arm feasibility trial sponsored by the Society of American Gastrointestinal and Endoscopic Surgeons and the American Society of Colon and Rectal Surgeons. The primary investigator, Patricia Sylla, aims to enroll 100 patients from 11 sites.

    Training program

    Although the early results from the international TaTME registry are encouraging, the participating surgeons encountered intraoperative complications and difficulties in up to 40% of procedures. These difficulties include unstable pneumorectum, ineffective smoke evacuation, and difficulty developing the correct plane. The specific intraoperative complications associated with TaTME included wrong plane dissection, which may cause presacral bleeding if the dissection plane is too posterior, or injury to the hypogastric nerve bundles if the dissection plane is too lateral. The membranous urethra in males is also vulnerable when dissection is too anterior. Those specific complications and difficulties highlight the need for structured and accredited training program. Several authors have addressed the proper training pathway to the incorporation of TaTME into clinical practice[19-25].

    McLemore et al.[24] developed 6 key elements for the safe practice of TaTME. The authors recommended expertise in TME, laparoscopic colorectal surgery, transanal minimally invasive surgery, and intersphincteric dissection. Appropriately qualified individuals should then practice in cadaver models and enter all data in a clinical registry.

    Francis et al.[22] conducted a consensus agreement from 207 colorectal surgeons across 18 countries including 52 TaTME specialists. They recommended that prerequisites to learn TaTME should include 3 factors: the trainee, the mentor, and the training facility. The trainee must be an accredited laparoscopic colorectal surgeon with experience of more than 30 laparoscopic TME cases, more than 5 TEM/TAMIS cases, and that the anticipated volume of TaTME cases will be more than 20 per year. The mentor must have performed at least 30 TaTMEs, is experienced in cadaveric training, and has at least two publications per year in the field of TaTME. The training facility should have a cadaveric lab and at least 10 trainees and at least 2 courses per year. For the training curriculum, the authors’ recommendation includes 4 stages: self-learning, cadaver workshop, proctorship of the initial 5-10 cases, and, finally, independent practice with continued collection input into the registry.

    Koedam et al.[26] evaluated the learning curve of TaTME in 138 patients with rectal cancer over a 60-month period. The authors reported improvement in postoperative outcomes after the first 40 patients, showing a decrease in major postoperative complications from 47.5% to 17.5% and leakage rate from 27.5% to 5%. In addition, the mean operative time (42 min) and conversion rate (from 10% to 0%) was lower after transitioning to a two-team approach, although neither endpoint decreased with experience.

    Present and future

    Anatomical factors that may make TaTME a preferred approach for rectal cancer include male gender, low cancers, narrow pelvis, high body mass index, and distorted tissue planes due to neoadjuvant radiotherapy[27-29]. Although the use of TaTME seems clearly advantageous for the treatment of mid and low rectal cancer, there are potential advantages to its use in upper rectal cancer, above the peritoneal reflection. Early in the learning curve it is easier to perform TaTME in higher tumors and use those cases in order to gain experience in TaTME for the more challenging, distal cancer cases. The second reason to approach upper rectum cancer transanally is the fact that the rectal specimen is of better quality in TaTME approach[30,31]. TaTME may also serve as a useful platform for proctectomy for benign diseases such as inflammatory bowel disease requiring proctectomy, rectal stricture, radiation proctitis, and Hartmann’s procedure reversal.

    Leo et al.[32] reported their experience of 16 total proctocolectomies and ileal pouch anal anastomoses (TPC + IPAA) for refractory mucosal ulcerative colitis using TaTME-assisted single port laparoscopy. The median operative time was 247 (185-470) min and the overall conversion rate to open surgery was 18.7%. The 30-day surgical complication rate was 37.5% (Clavien-Dindo 1 in four patients, 2 in one patient and 3 in one patient who developed anastomotic leak). Carvello et al.[33] reported a case of TaTME assisted laparoscopic TPC + IPAA for familial adenomatous polyposis (FAP) with satisfactory results. Ambe et al.[34] reported their experience with 8 patients who underwent TaTME assisted laparoscopic TPC + IPAA for FAP. In all cases, surgery was successfully completed using TaTME and no perioperative complications were recorded. Trépanier et al.[35] described their technique and experience with 10 patients who underwent reversal of Hartmann’s procedure using combined laparoscopic and TaTME approaches. Indications for Hartmann’s procedure were complicated diverticulitis, anastomotic leak, and rectosigmoid cancer. Reconstruction was achieved in all patients. One low colorectal anastomosis was hand sewn and the other 9 were stapled. Diverting loop ileostomies were created in five patients and all were closed during the following year. One case required hand-assistance but there was no conversion to open surgery. Three patients had a total of four post-operative complications, none of whom required reoperation.

    Robotic technology includes 3-D optical visualization, ambidextrous movements, a tremor filter, and more degrees of freedom of the effector tip movement than standard instruments. These theoretical benefits may be of specific significance in confined spaces. Recently, Intuitive Surgical (Sunnyvale, California) launched the da Vinci® single port platform. The device combines a single site port with flexible robotic arms and instruments and improved ergonomics. Its use has mainly been described in gallbladder resections, gynecological operations, and urological procedures[36-39]. Jiménez-Rodríguez et al.[38] reported two cases of robotic low anterior resection with reduced ports, using the single-port robotic platform. There were no intraoperative complications and the pathology report showed complete TME specimens[38]. Atallah et al reported the first clinical case of robotic transanal TME in a patient with a T3N1 rectal tumor located 4 cm from the anal verge. There were no complications, negative distal and circumferential margins were achieved, and the specimen quality was near-complete[40]. Verheijen et al.[41] reported their first case of robotic TaTME without complications and histology showed a complete mesorectal excision with free distal and circumferential margins. Marks et al.[42] reported the successful transanal use of the single-port system robotic platform (SPS) on four cadavers. There were no piecemeal or fragmented resections and, subjectively, closure was deemed good-to-excellent in all cases. Surgeon assessment of setup and performance of the SPS was excellent in all cases[42,43]. Kuo et al.[44] reported the largest series to date of 15 consecutive patients with ultra-low rectal tumors who underwent robotic TaTME followed by trans-abdominal robotic single port proctectomy and one additional port. The median number of lymph nodes harvested was 12. All patients had negative circumferential and distal resection margins[44].

    Huscher et al.[43] reported seven cases of TME using a hybrid technique combining robotic TaTME and laparoscopic abdominal procedure (vessel division and colon mobilization). Macroscopic assessment showed complete mesorectum in six cases and near complete mesorectum in one case, the mean number of lymph nodes was 14 and DRM and CRM were negative in all cases[43].


    TaTME offers several potential advantages compared to standard transabdominal TME. Several trials are currently underway to test this hypothesis. The single port robot may further facilitate introduction and adaptation of the TaTME method of TME.


    Author’s contribution

    Writing manuscript, critical review and final edits: Wexner SD

    Writing manuscript and final edits: Yellinek S

    Availability of data and materials

    Not applicable.

    Financial support and sponsorship


    Conflicts of interest

    Dr. Wexner is a paid consultant and receives royalties from Intuitive Surgical Karl Storz Endoscopy, and Medtronic and consulting fees from Novodaq.

    Ethical approval and consent to participate

    Not applicable.

    Consent for publication

    Not applicable.


    © The Author(s) 2018.


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    Cite This Article

    Yellinek S, Wexner SD. The role of transanal total mesorectal excision in rectal surgery. Mini-invasive Surg 2018;2:22.


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