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Vol. 35. Issue 3.
Pages 139-186 (July - September 2015)
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Vol. 35. Issue 3.
Pages 139-186 (July - September 2015)
Technical Note
DOI: 10.1016/j.jcol.2015.06.003
Open Access
Transanal Endoscopic Proctectomy: a new approach to the total excision of the mesorectum
Protectomia Endoscopica Transanal (TaETM): Uma nova abordagem para excisão total do mesoreto
Carlos Ramon Silveira Mendesa,b,c,
Corresponding author

Corresponding author at: Residence Program in Coloproctology, Hospital Geral Roberto Santos, Salvador, BA, Brazil.
, Luciano Santana de Miranda Ferreiraa,c, Ricardo Aguiar Sapucaiaa,c, Meyline Andrade Limaa,c, Eduardo Costa Cobasa,c, Sergio Eduardo Alonso Araujoc,d,e
a Service of Coloproctology, Hospital Santa Izabel, Santa Casa de Misericórdia da Bahia, Salvador, BA, Brazil
b Residence Program in Coloproctology, Hospital Geral Roberto Santos, Salvador, BA, Brazil
c Sociedade Brasileira de Coloproctologia, Brazil
d Department of Gastroenterology, Medicine School, Universidade de São Paulo (USP), São Paulo, SP, Brazil
e Service of Colon and Rectum Surgery, Hospital das Clínicas, Medicine School, Universidade de São Paulo (USP), São Paulo, SP, Brazil
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Colorectal cancer is a serious public health problem. In 1982, Heald managed to reduce mortality by standardizing the total excision of mesorectum. The use of transanal endoscopic microsurgery has emerged to allow resection of rectal tumors as a minimally invasive method. With the association of Transanal Endoscopic Operation with total excision of mesorectum, it was possible to develop a new approach for total excision of mesorectum.

Surgical technique

The procedure is started by the perineal time with Transanal Endoscopic Operation device; introduction of Transanal Endoscopic Operation system follows, with exposure of the lesion with a circumferential incision at a distance between 2 and 4cm from distal tumor margin after making a purse string suture to close the rectal stump. Then, dissection is carried out by the posterior portion until reaching the presacral avascular fascia, completing the mesorectal circumferential dissection until the peritoneal reflection. After this step, a laparoscopic procedure is performed with the use of three trocars, with mobilization of splenic flexure and ligation of the inferior mesenteric artery, as well as confection of a protective ileostomy. Then, transanal removal of the surgical specimen is performed, and the procedure goes on with a coloanal anastomosis.

Minimally invasive surgery
Rectal cancer
Transanal endoscopic microsurgery

O câncer colorretal é um serio problema de saúde publica. Em 1982, Heald conseguiu reduzir a mortalidade com a padronização da excisão total do mesoreto. O uso da Microcirurgia endoscópica transanal surgiu para proporcionar ressecções de tumores de reto como método minimamente invasivo. Com a associação do TEO a ETM foi possível desenvolver uma nova abordagem para ETM.

Técnica cirúrgica

O procedimento é iniciado pelo tempo perineal com o aparelho de TEO. Em seguida o sistema TEO é introduzido, com exposição da lesão por meio de uma incisão circunferencial a cerca de 2 a 4cm da margem distal do tumor após a confecção de sutura em bolsa com fechamento do coto retal. Em seguida, faz-se dissecção pela porção posterior até a fáscia avascular pré-sacral, completando a dissecção circunferencial do mesorreto até atingir a reflexão peritoneal. Após essa etapa, faz-se laparoscópica com utilização de três trocateres, com mobilização do ângulo esplênico e ligadura da artéria mesentérica inferior, e também a confecção de uma ileostomia protetora. O espécime cirúrgico é retirado pela via transanal, e o procedimento tem continuidade com uma anastomose coloanal.

Cirurgia minimamente invasiva
Cancer de reto
Microcirurgia endoscópica transanal
Full Text

Colorectal cancer (CRC) is a serious health problem worldwide. It is known that 25% of CRC cases are located in the rectum.1,2

In 1982, Heald et al. proposed a standardization of total excision of mesorectum (TEM), whose initial results were surprising in terms of local recurrence.3 Through standardization of the technique, these authors managed to reduce local recurrence to less than 10% and increase the overall survival for 80%. The transabdominal-transanal (TATA) technique described by Marks4,5 improved the quality of life for patients who would be submitted to abdominoperineal amputation, enabling its realization by laparoscopy.

The transanal endoscopic microsurgery (TEM) was introduced in 1983 by G. Buess as a minimally invasive technique for the resection of adenomas and early rectal carcinomas.6–9

Using TATA technique, performing abdominal time by laparoscopy and perineal time with Transanal Endoscopic Operation (TEO; Storz, Tuttlingen, Germany) system, Transanal Endoscopic Proctectomy (TAEP) was established.

The quality of TEM with lymph node resection in pursuit of a single objective which is the RO resection, has promoting the search for new tactics and techniques. Obese patients with narrow pelvis with a fatty mesorectum which has a fibrosis plane mainly with a big prostate have hindered the resection by laparoscopy.

TAEP emerged as an alternative for difficult cases of rectal adenocarcinoma.

This is a technique that is performed by transanal route; in it, one circumferential rectal incision with dissection of the whole rectum together with the mesorectum to the abdominal cavity is carried out. The abdominal period is developed by laparoscopy to release the splenic flexure and by inferior mesenteric artery and vein ligature.

Surgical technique

In February 2014, one of the first cases in Brazil of TAEP for treatment of rectal tumor was conducted at Hospital Santa Izabel, Salvador – Bahia. Preoperatively, the patient filled and signed a free and informed consent form and was instructed regarding the procedure.

To perform the proctectomy, some preoperative measures were implemented, for example, mechanical bowel preparation and prophylactic antibiotic therapy during anesthetic induction.

Following general anesthesia, the patient is placed in lithotomy position.

The procedure is initiated by the perineal time, where the TEO system will be used. Next, digital expansion for introduction of TEO system, exposure of pectineal line with a circumferential incision 2–4cm from the distal tumor margin, and a purse string suture with closure of the rectal stump with vicryl 3.0 is carried out (Fig. 1). Then, a circumferential demarcation of the rectum with the use of electrocautery is performed. Using a Harmonic scissors (Ethicon Endo-Surgery) the surgeon keep doing the dissection through the posterior portion to the avascular presacral fascia, completing the circumferential dissection through the mesorectum to reach the peritoneal reflection. After this step is completed, a laparoscopic procedure with an inventory of the cavity is carried out, with the use of three trocars (a 10-mm trocar in the umbilical region, another 11-mm trocar in the region where the ileostomy will be built, and a 5-mm trocar in the right flank). Then, the surgeon proceeds with mobilization of the splenic flexure and ligation of the inferior mesenteric artery, in addition to making a protective ileostomy. The surgical specimen is removed (Fig. 2) by transanal route, and the procedure goes on with a manual coloanal anastomosis (Figs. 3 and 4).

Fig. 1.

Closing of rectal lumen.

Fig. 2.

Removal of the surgical specimen.

Fig. 3.

Coloanal anastomosis.

Fig. 4.

Final appearance.

Experimental and cadaveric models

The TATA resection technique was first described by Marks, as an alternative to abdominoperineal resection with permanent colostomy in patients with low rectal cancer. In 2010, Marks described his experience with TATA laparoscopically, reporting a case series of 79 patients with no perioperative mortality and low conversion (2.5%) and recurrence (2.5%) rates.4 With the advent of natural orifice endoscopic surgery (NOTES) and with the use of minimally invasive techniques for transanal tumor resection (TEM), the technique has been refined.

From that moment on, a demonstration of safety and applicability of TAEP started off, with the help of studies in pigs and human corpses.10–14

In 2010, Patricia10 published her experience in pigs using the rectoscope to perform TEM.

In 2013, McLemore held TAEP using minimally invasive transanal surgery (TAMIS) in a series of 5 human corpses (all male), with a surgical time of 200 (128–249)min. In the perianal time, this author used GelPOINT-Path; in the abdominal access, the author used a GelPOINT in the region of the making of ileostomy and an accessory 5-mm trocar in the left inguinal region (site of pelvic drainage). As a complication, an injury to the splenic capsule occurred during surgery.15–18

In the same year, Telen et al.19 published the largest series in cadavers, with 32 cases and mean operative time of 5.1h. In all specimens, it was possible to resect the intact rectum.

With the advent of robotics, new studies have been published, with robot use for access to the perineal time, in association with a single-portal device. The first report of this model was published by Atallah; this author conducted four days of experiments, showing that the use of the robot is feasible and safe; however, the cost of its use is still very high.20,21

Clinical series

The first report of TAEP with the use of TEO platform was described in 2010 by Patricia et al.22 The patient was a woman of 76 years with adenocarcinoma of the rectum T2N2. The patient underwent a TAEP with surgical time of 4h and 30min. Abdominal access was performed through three portals (one 10-mm portal in the umbilical region, one 5-mm portal in the right flank, and one 2-mm portal in the left inguinal region). Coloanal manual anastomosis was performed, and the specimen was removed by transanal route; a protective ileostomy was made.

The post-surgical results revealed that the patient was with a T1N0 adenocarcinoma with 23 disease-free lymph nodes.

In 2012, the first series of cases in humans was published, with a total of 5 patients (3 males). The mean operative time was 175 (160–194)min, the patients had stage II or III adenocarcinoma. There was one intraoperative complication (pneumo-retroperitoneum) that made it difficult the surgical technique. Postoperatively, one prolonged ileus case and another case of pelvic abscess (which was externally drained) were reported.

In 2013, Lacy published his series of 20 patients with mean BMI of 25.3 and with adenoma and rectal adenocarcinoma. The operative time was 234 (150–325)min. There were no intraoperative complications. Postoperatively, a case of urinary retention, and also prolonged ileus, was reported; and one patient required readmission due to severe dehydration.

The largest series in humans was reported by Rouanet, with 30 cases. All patients were male. The criteria for use of TAEP technique were: adenocarcinoma carrier, presenting a thick mesorectum, or high body mass index (BMI), or tumor fibrosis, or a narrow pelvis (bi-tuberal distance <10cm, bi-ischial distance <12cm). The mean operative time was 304 (170–432)min. In the early series, two cases of urethral injury and a case of thromboembolism were reported. Subsequently, severe sepsis and one case of intestinal obstruction were diagnosed. The Quirke classification was used to analyze the mesorectum, and all patients were classified as grade 3.


During laparoscopy, when TEM, recommended by Heald, is carried out, in some cases the surgeon has struggled to get an upstanding specimen without causing harm to the mesorectum.

These difficulties arise mainly in male patients and also in obese patients.

Rouanat11 after using TAEP, advocated some indications for its proper execution: being an adenocarcinoma carrier, and to meet one of the following criteria: thick mesorectum, high BMI, tumor fibrosis, a narrow pelvis (bi-tuberal distance <10cm, bi-ischial distance <12cm).

With these criteria, a upstanding piece of mesorectum was obtained. This suggests that this surgical approach is the best for these cases.

Today, for this procedure there are several ways to a perineal approach with TEO and TAMIS.23,24 In these studies, their authors proved that the use of the several tools equipment found in the market to carry out TAMIS is viable, and this is true also for the equipment for TEO.

The laparoscopic abdominal time has proven to be straightforward; one needs only to do the ligation of the inferior mesenteric vessels, besides the release of the splenic angle of the colon; to this end, one can resort to minilaparoscopy, to single portal technique, or even to multiportals. The complications so far encountered were minor, and all of them could be resolved. The most common complication was urethral injury, especially in the initial phase of the procedures, because of the difficulty in recognizing a new dissection plane.

When examining the surgical specimen, it was possible to obtain a wholesome piece in all cases, as recommended by Heald.

New technologies are emerging; and when they are well applied, should be used for the best treatment of the patient. And new studies are emerging, and new experiences have been tried, thus resulting in greater certainty in the application of TAEP techniques.

Conflicts of interest

The authors declare no conflicts of interest.

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This work was conducted at Hospital Santa Izabel, Santa Casa de Misericórdia da Bahia, Salvador, BA, Brazil.

Copyright © 2015. Sociedade Brasileira de Coloproctologia
Journal of Coloproctology

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