This file addresses transanal endoscopic microsurgery (TEM) together a way of excising rectal lesions.

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TEM is a minimally invasive surgical procedure that offers the opportunity for regional excision the rectal lesions that cannot be directly visualized. As such, the is an alternative to open up or laparoscopic operation excision the rectal lesions.

Clinical Indications

Medically Necessary:

Transanal endoscopic microsurgery (TEM) is thought about medically important for therapy of rectal lesions including rectal tumors and rectal polyps the are appropriate for treatment by neighborhood excision yet are also proximal come be got to using standard transanal excision methods.

Not median Necessary:

Transanal endoscopic microsurgery (TEM) is considered not medically necessary once the criteria over have no been met.


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When services might be Medically vital when criteria room met:



Excision the rectal tumor, transanal endoscopic microsurgical method (ie, TEMS), including muscularis propria (ie, complete thickness)

ICD-10 Procedure


Excision that rectum, via herbal or fabricated opening endoscopic

ICD-10 Diagnosis

All diagnoses

When solutions are no Medically Necessary:For the procedure codes listed above once criteria room not met.

Discussion/General Information

Surgery is the most typical treatment for rectal tumors. The type of surgery preferred will rely upon several factors including, but not necessarily restricted to the location of the tumor, exactly how deeply it has penetrated the rectal wall, and also whether the tumor has spread to nearby lymph nodes or various other parts the the body.

TEM is a minimally invasive operation procedure that provides the chance for neighborhood excision that rectal lesions that cannot be straight visualized. As such, it is an alternate to open up or laparoscopic operation excision the rectal lesions. The TEM operating system consists of a committed magnifying resectoscope, ports because that carbon dioxide gas insufflation and also irrigation and enables the i of dissecting instruments. The operation system likewise monitors and also regulates intrarectal pressure. Suction is offered to remove blood, smoke, and particulate matter from the surgical field. TEM is being investigated as a much less invasive surgical choice in bespeak to prevent the possible adverse results (sexual and urinary dysfunction, colostomy) associated with radical surgical techniques.

TEM is one inpatient procedure that can be performed v the individual under basic anesthesia or regional anesthesia native a spinal block. In some instances the tumor may be too advanced to be eliminated by regional resection and a an ext aggressive surgical approach is required.

Surgical excision of rectal lesions entails the balance between adequate excision and also surgical morbidity related to sphincter role and top quality of life. For an individual v rectal cancer, this balance often entails the an option between neighborhood transanal cut versus an ext extensive open up or laparoscopic resection. Local excision has been taken into consideration a treatment option for tiny rectal cancers (less 보다 4 cm) confined to the submucosa (T1 lesions); even so, the is approximated that 10-15% of people will have metastases to the regional lymph nodes, thus increasing the risk of local recurrence. Some individuals are readily available local excision based on co-morbidities precluding an ext extensive surgery, and local excision may also be performed together a palliative procedure.

Local excision has actually primarily been performed under straight visualization, i beg your pardon is minimal to those lesions occurring within 8 cm of the anal verge. TEM attempts to duplicate the surgical approaches of neighborhood excision using direct visualization. TEM permits neighborhood excision beyond the distal rectum, as much proximally as the rectosigmoid junction (Baxter, 2007). As detailed in the rectal cancer indict of the National comprehensive Cancer Network (NCCN, 2020):

Both transanal local excision and also TEM involve a complete thickness cut performed perpendicularly through the bowel wall into the perirectal fat. Negative (> 3 mm) deep and mucosal margins space required and tumor fragmentation must be avoided. The in your ar excised specimen should be oriented and also pinned prior to fixation and also brought to the pathology by the surgeon to facilitate an oriented histopathologic evaluation of the specimen. If pathologic examination reveals adverse features such as hopeful margins, LVI, poor differential or invasion right into the lower third of the submucosa (sm3 level), a an ext radical resection is recommended.

Key considerations in the review of TEM relate to its ability to duplicate the surgical values of local excision under straight vision. For example, if TEM outcomes in an incomplete or fragmentized resection, then the surgery will most likely be followed up through a much more radical resection. Thus vital outcomes of attention include:

Rate of conversion to open up or other procedures;Complete or incomplete resection;Need for subsequent radical rectal excision;Reoperation rate; andAnorectal function.

TEM has actually been target to lesions that room inaccessible by regional excision under direct vision. Alternative surgical choices for these people consist of open or laparoscopic excision. An essential outcomes when comparing TEM to choices include:

Operating time;Operative complications;Length that hospital stay; andReadmission rate.

When comparing data regarding the long-term survival and recurrence prices for people with rectal cancer, it need to be detailed that recurrence rates with any form of local excision will most likely be higher than much more radical excision, and also thus survival and recurrence rates have to be compared to neighborhood excision using direct visualization.

TEM has been extensively used outside of the unified States and a large number that case collection have been reported, including individuals through both benign and also malignant conditions. A methodical review published in 2005 figured out 55 situation series, 1 randomized study and 2 nonrandomized comparative research studies (Middleton, 2005). The majority of the lesions to be located in between 4 and 22 cm from the anal verge. Return the writer reported that the overall quality that the research studies was poor, the review suggested that there to be no differences in the recurrence or survival prices or complication between TEM and also radical resection for the treatment of carcinomas.

In the single randomized study, people with adenomas (n=188) or rectal cancer (n=53) underwent either TEM or open up resection. Together reviewed through Middleton (2005), the adhering to outcomes to be either similar or enhanced when compared to open up resection:

Overall at an early stage complications;Late complications (mean follow-up 45 months);5-year neighborhood recurrence;Operating time;Length the hospital stay; andAnalgesic requirement.

In the whole group the 123 people undergoing TEM, there was no report of tumor expanding to the resection margin and only one conversion to an open procedure. In a nonrandomized comparison trial, the conversion price to an open up procedure to be 2 the 80 TEMs (2.5%).

Lezoche and colleagues released two reports the a randomized trial; these researches likely included overlapping subjects (Lezoche 2005, Lezoche 2008). The 2008 research reported top top 5-year follow-up and included more individuals than the initial 2005 report. The 2008 report is summarized as follows: 70 individuals were enrolled with T2 rectal cancer through no imaging proof of lymph node or remote metastases and also individuals to be randomized to undergo TEM or laparoscopic resection. All study subjects underwent preoperative neoadjuvant chemoradiotherapy. Local excision, i beg your pardon has usually been restricted to people with T1 lesions, was also considered in this examine for individuals with T2 lesions. This examine was not focused on the technical capability of TEM, but rather the function of neoadjuvant chemotherapy to minimize the risk of neighborhood recurrence in this higher risk team of individuals. The primary outcome measure up was permanent recurrence and also survival prices in the two teams of individuals. In ~ the mean follow-up period (56 months) in both groups, 1 local failure (5%) emerged after 6 month in the TEM group and 1 (5%) after 48 month in the laparoscopic group. Distant metastases arisen in 1 individual (5%) in the TEM group after 26 months and 1 separation, personal, instance (5%) in the laparoscopic team at 31 months. The probability of survive was 95% for TEM and 83% because that laparoscopic resection.

Lezoche and colleagues (2012) reported the results of a prospective randomized attempt which contrasted endoluminal locoregional resection (ELRR) by transanal endoscopic microsurgery matches laparoscopic complete mesorectal cut (TME) as a treatment for little non-advanced short rectal cancer. Study participants were randomized come ELRR or TME and all had actually rectal cancer which to be clinically staged together cT2 N0 M0, histological class G1-2, tumor less than 3 cm in diameter and also within 6 centimeter of the anal verge. Examine participants also received neoadjuvant chemoradiation before surgery. ~ chemoradiation, the entrants underwent repeat staging to evaluate tumor solution and were subsequently randomized to one of two people the ELRR perform by TEM or the laparoscopic TME group. Fifty entrants in each team were analyzed. The primary endpoint the the research was the oncological an outcome in state of neighborhood recurrence or distant metastases, v minimum follow-up the 5 years. An additional endpoints included cancer-related mortality, expression of operation, blood loss, analgesic use, morbidity, hospital stay and 30-day mortality. As whole tumor downstaging and also downsizing prices after neoadjuvant chemoradiotherapy were similar in both groups, 51% and 26% respectively. Tumors to be downstaged in 26 attendees in the ELRR team (14 to pT0, 12 come pT1) and also 25 in the TME team (13 come pT0, 12 come pT1). The the staying 46 participants, 26 (13 in each group) had actually a reduction in tumor diameter of more than 50%. In the remaining subjects, a reduction in tumor diameter of much less than 50% to be observed. All of the participants had R0 resection v tumor-free resection margins. There were no statistically far-reaching differences between the teams in young or major postoperative complications. None of the attendees in the ELRR group experienced a conversion to open surgery or stoma. However, in the TME group, 6 participants (12%) had actually a change in the operative program during the operation with the procedure being converted come an open procedure in 5 subjects (10%). Twenty-three entrants in this group forced a stoma, i beg your pardon was short-lived in 11 individuals (22%), and also definitive in 12 people (24%) who underwent abdominoperineal resection. At irreversible follow-up, local an illness recurrence emerged in 4 people (8%) who underwent ELRR and also 3 people (6%) who had undergone TME. Far-off metastases emerged in 2 individuals (4%) in every group. There was no statistically significant difference in disease-free survival (P=0.686). All at once survival prices at the finish of follow-up were 72% (51 to 86) and 80% (62 to 90) respectively (P=0.0609). The authors concluded that the probability of arising recurrence or metastases and cancer-related survival was comparable in both groups. However, results favored ELRR by TEM in terms of operating time, blood loss and transfusions, need for analgesia and hospital stay.

In 2012, Kumar and also colleagues reported on the usage of TEM because that rectal carcinoids in the united States. Data from subjects who had actually undergone TEM because that rectal carcinoids were prospectively gathered and then analyzed. The researcher reviewed participant and tumor characteristics, operative and also perioperative details, as well as oncological outcomes. During a 12-year period, 24 subjects underwent TEM for rectal carcinoids. That these, 6 (25%) surgical measures were major surgical resections and also 18 (75%) to be performed after incomplete snare excisions during colonoscopy. Histopathological examination revealed 3 (17%) of the participants who underwent full-thickness resection after ~ snare excision had actually a residual tumor. An unfavorable margins were derived in all cases and also no recurrences to be noted. The researchers concluded the TEM is one effective and safe surgical option for rectal carcinoids much less than 2 centimeter in diameter, with typical features and also located much more than 5 cm from the anal verge. The authors likewise concluded the TEM can be used for main resection or because that resection ~ incomplete colonoscopic snare excision.

As a representative example of reported case series, Baatrup and colleagues report on the outcomes the 143 consecutive individuals undergoing TEM because that rectal cancer (Baatrup, 2009). TEM was performed for curative intent in 43% that the subjects, in 52% of individuals considered unfit for much more extensive surgery and for palliation in 5% of individuals. A total of 15% the individuals had immediate reoperation. The cancer certain survival because that T1 lesions was 94%. Guerrieri and also colleagues (2008) reported on a 15-year endure with TEM in 196 people with rectal cancer v either T1, T2, or T3 lesions. Individuals with T2 or T3 lesions underwent neoadjuvant therapy. Young complications were reported in 8.6% the individuals, the neighborhood recurrence rate was 4.1%. Together a representative instance of a compare study, Moore and also colleagues (2008) compared the outcomes in two teams of people undergoing either timeless transanal excision (n=89) or TEM (n=82) for rectal cancer. Clinical records to be reviewed to determine form of surgery, resection margins, specimen fragmentation, complications, recurrence, lesion type stage and also size. The two teams were similar in baseline characteristics. There to be no distinction in complication rates in between the two groups, and TEM was more likely to yield clean surgical margins and also a nonfragmented specimen. This study argues that TEM might be desired over conventional transanal excision in any type of location. Lee and colleagues retrospectively compared the outcomes in 74 people treated through TEM contrasted to 100 people treated with radical surgery and reported 5-year recurrence and also survival rates (Lee, 2003). For individuals with T1 rectal cancer, there was no distinction in recurrence or survival rates in the 2 groups. For individuals with T2 cancer, there was a higher incidence of recurrence in the TEM group, yet the all at once survival was similar in the two groups.

A range of guidelines and also practice parameters have recognized TEM as a treatment option for individuals with rectal cancer.

The American culture of Colon and also Rectal surgeons (ASCRS) exercise parameters because that the management of rectal cancer show that the criteria for regional treatment include well come moderately identified T1 rectal cancer. Tumor size have to be much less than 3 centimeter in diameter and occupy less than one-third the the one of the bowel lumen. Operation candidates must not have perineural or lymphovascular invasion. The exercise parameter likewise indicates that while over there lacks fine designed randomized managed trials addressing TEM, it appears to be exceptional to the transanal approach in regards to visualization and also resection of greater lesions (Monson, 2013).

The NCCN Clinical exercise Guidelines in Oncology on Rectal Cancer (2020) provide selection criteria because that transanal excision, and also then keep in mind that “TEM can facilitate cut of small tumors through the anus as soon as lesions can be adequately determined in the rectum. TEM may be technically feasible for an ext proximal lesions.”

The national Cancer institute (NCI) provides basic information about the therapy of rectal cancer and notes that the surgical technique to therapy varies follow to the location, stage, and presence or absence of high-risk functions (for example, optimistic margins, lymphovascular invasion, perineural invasion and also poorly differentiated histology). Surgical ideologies may include transanal local excision and also TEM for choose clinical staged T1/T2 N0 rectal cancers (NCI, 2018).

The europe Association for Endoscopic surgery (EAES) clinical agreement guidelines on at an early stage rectal cancer concluded that TEM is one established technique for neighborhood excision that selected early rectal cancer (Morino, 2015).

SummaryTEM is designed to duplicate the surgical principles of regional excision under straight visualization. Together such, it have the right to be thought about a surgical tool that enables access to much more proximal rectal lesions. If there are minimal controlled trials directly comparing the technological abilities the TEM and also conventional neighborhood excision, small randomized trials and also numerous case series suggest the the two approaches have similar technical performance. In addition, because that proximal rectal lesions, the surgical different is a more extensive open up or laparoscopic resection with connected increased morbidity. Cancer recurrence prices are a problem with any type of local excision, but the recurrence prices are mainly related to the status of the lymph nodes, which space not removed with either TEM or conventional regional excision. Lymphovascular invasion and adverse histologies are predictors of neighborhood recurrence, however these parameters can only be showed postoperatively in both techniques. Finally, the ASCRS, NCCN and also the NCI all identify TEM as a surgical alternative in carefully selected individuals.


Colostomy: operation procedure wherein a part of the colon (large intestine) is brought through the abdominal wall to happen stool out of the body.

LVI (lymphovascular invasion): The spread of spread of a cancer into the lymphatics and/or blood vessels.

Lymph node: Small, ring or bean-shaped tiny bodies located along the lymphatic vessels that filter foreign particles and bacteria native lymph fluid.


Peer reviewed Publications:

Baatrup G, Breum B, Qvist N, et al. Transanal endoscopic microsurgery in 143 continuous patients v rectal adenocarcinoma: results from a Danish multicenter study. Colorectal Dis. 2009; 11(3):270-275.Baxter NN, Garcia-Aguilar. Body organ preservation because that rectal cancer. J Clin Oncol. 2007; 25(8):1014-1020.Guerrieri M, Baldarelli M, Organetti L, et al. Transanal endoscopic microsurgery for the treatment of selected patients v distal rectal cancer; 15 year experience. Surg Endosc. 2008; 22(9):2030-2035.Kumar A, Sidani S, Kolli K; et al. Transanal endoscopic microsurgery because that rectal carcinoids: the biggest reported United claims experience. Colorectal Dis 2012; 14(5):562-566.Lee W, Lee D, Choi S, Chun H. Transanal endoscopic microsurgery and also radical surgery for T1 and also T2 rectal cancer. Surg Endosc. 2003; 17(8):1283-1287.Lezoche E, Guerrieri M, Paganini AM, et al. Transanal endoscopic versus full mesorectal laparoscopic resections the T2-N0 low rectal cancers after ~ neoadjuvant treatment: a prospective randomized trial with a 3-years minimum follow-up period. Surg Endosc. 2005; 19(6):751-756.Lezoche G, Baldarelli M, Guerrieri M, et al. A prospective randomized research with a 5-year minimum follow-up evaluation of transanal endoscopic microsurgery matches laparoscopic complete mesorectal excision after neoadjuvant therapy. Surg Endosc. 2008; 22(2):352-358.Lezoche E, Baldarelli M, Lezoche G. Et al. Randomized clinical attempt of endoluminal locoregional resection versus laparoscopic full mesorectal excision for T2 rectal cancer ~ neoadjuvant therapy. Br J Surg. 2012; 99(9):1211-1218.Middleton PF, Sutherland LM, Maddern GJ. Transanal endoscopic microsurgery: A systematic review. Dis Colon Rectum. 2005; 48(2):270-284.Moore JS, Cataldo PA, Osler T, Hyman NH. Transanal endoscopic microsurgery is an ext effective than classic transanal excision because that resection that rectal masses. Dis Colon Rectum. 2008; 51(7):1026-1030.

Government Agency, clinical Society, and also Other classic Publications:





Medical plan & technology Assessment Committee (MPTAC) review. Update Discussion/General Information, References, website for added Information and background sections. Reformatted Coding section.


MPTAC review. To update Discussion/General Information, References, web page for added Information and background sections.


MPTAC review. Update Discussion/General Information, References, websites for added Information and history sections.


MPTAC review. Initial file development. Moved content the SURG.00110 Transanal Endoscopic Microsurgical (TEM) excision of Rectal Lesions to brand-new clinical utilization management guideline record with the same title.

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