Expandable metal stent placement for benign colorectal obstruction: outcomes for 23 cases

Interventional endoscopy in inflammatory bowel disease: a comprehensive review

Interventional endoscopy can play a key role in the multidisciplinary management of complex inflammatory bowel disease (IBD) as an adjunct to medical and surgical therapy. The primary role of interventional IBD (IIBD) includes the treatment of Crohn's disease-related stricture, fistula, and abscess. Endoscopic balloon dilation (EBD), endoscopic stricturotomy, and placement of endoscopic stents are different forms of endoscopic stricture therapy. EBD is the most widely used therapy whereas endoscopic stricturotomy has higher long-term efficacy than EBD. Fully covered and partially covered self-expanding metal stents are useful in long and refractory strictures whereas lumen-apposing metal stents can be used in short, and anastomotic strictures. Endoscopic fistula/abscess therapy includes endoscopic fistulotomy, seton placement, endoscopic ultrasound-guided drainage of rectal/pelvic abscess, and endoscopic injection of filling agents (fistula plug/glue/stem cell). Endoscopic seton placement and fistulotomy are mainly feasible in short, superficial, single tract fistula and in those with prior surgical seton placement. Similarly, endoscopic fistulotomy is usually feasible in short, superficial, single-tract fistula. Endoscopic closure therapies like over-the-scope clips, suturing, and self-expanding metal stent should be avoided for de novo/bowel to hollow organ fistulas. Other indications include management of postoperative complications in IBD such as management of surgical leaks and complications of pouchitis in ulcerative colitis. Additional indications include endoscopic resection of ulcerative colitis-associated neoplasia (by endoscopic mucosal resection, endoscopic submucosal dissection, and endoscopic full-thickness resection), retrieval of retained capsule endoscope, and control of bleeding. IIBD therapies can potentially act as a bridge between medical and surgical therapy for properly selected IBD patients.

Endoscopic Management of Colonic Obstruction

Large bowel obstruction is a serious event that occurs in approximately 25% of all intestinal obstructions. It is attributed to either benign, malignant, functional (pseudo-obstruction), or mechanical conditions. Benign etiologies of colonic obstructions include colon volvulus, anastomotic strictures, radiation injury, ischemia, inflammatory processes such as Crohn's disease, diverticulitis, bezoars, and intussusception.

Endometriosis as an Uncommon Cause of Intestinal Obstruction-A Comprehensive Literature Review

The prevalence of intestinal endometriosis has been estimated to be between 3% and 37% of all endometriosis cases. Cases of intestinal occlusion due to endometriosis foci on the small bowel and on the large bowel are even rarer, with a reported prevalence of 0.1-0.7%. The aim of this literature review was to summarize the available published evidence on the diagnosis, characteristics, and management of intestinal occlusion due to endometriosis. The search on PubMed retrieved 295 records, of which 158 were rejected following a review of the title and abstract. After reviewing the full text, 97 studies met the Population, Intervention, Comparator, Outcomes, and Study (PICOS) criteria and were included in the analysis. The total number of patients with bowel occlusion due to endometriosis included in the studies was 107. The occlusive endometrial foci were localized on the ileum in 38.3% of the cases, on the rectosigmoid in 34.5% of the cases, at the ileocecal junction and the appendix in 14.9% of the cases, and at the rectum in 10.2% of the cases. Only one case reported large bowel obstruction by endometriosis of the hepatic flexure of the colon extending to the transverse colon (0.9%), and in one case the obstruction was caused by an omental giant endometrioid cyst compressing the intestines. We identified six cases of postmenopausal females with acute bowel obstruction due to endometriosis. Malignant degeneration of endometriosis was also identified as a cause of intestinal occlusion. The mechanisms of obstruction include the presence of a mass in the lumen of the intestine or in the wall of the intestine, extrinsic compression, adhesions, or intussusception.

A case report of a colouterine fistula treatment: when the patient chooses the steeplechase

Colouterine fistula is a rare disease that is primarily treated using surgical approaches. Although invasive surgery is controversial in terms of techniques and results, minimally invasive endoscopic treatments have not been widely described. However, because it is rare for these fistulas to close spontaneously, surgical treatment is often mandatory. Appropriate management of colouterine fistula is complicated, especially when the patient refuses surgery. In this case study, we provide the first description of a minimally invasive endoscopic treatment of an iatrogenic colouterine fistula using a self-expandable metallic stent after an over-the-scope clip malposition.

Outcomes of colon self–expandable metal stents for malignant vs benign indications at a tertiary care center and review of literature

BACKGROUND

Endoscopic placement of a self-expandable metal stent (SEMS) is a minimally invasive treatment for use in malignant and benign colonic obstruction. However, their widespread use is still limited with a nationwide analysis showing only 5.4% of patients with colon obstruction undergoing stent placement. This underutilization could be due to perceived increase risk of complications with stent placement.

AIM

To review long- and short-term clinical success of SEMS use for colonic obstruction at our center.

METHODS

We retrospectively reviewed all the patients who underwent colonic SEMS placement over a eighteen year period (August 2004 through August 2022) at our academic center. Demographics including age, gender, indication (malignant and benign), technical success, clinical success, complications (perforation, stent migration), mortality, and outcomes were recorded.

RESULTS

Sixty three patients underwent colon SEMS over an 18-year period. Fifty-five cases were for malignant indications, 8 were for benign conditions. The benign strictures included diverticular disease stricturing (n = 4), fistula closure (n = 2), extrinsic fibroid compression (n = 1), and ischemic stricture (n = 1). Forty-three of the malignant cases were due to intrinsic obstruction from primary or recurrent colon cancer; 12 were from extrinsic compression. Fifty-four strictures occurred on the left side, 3 occurred on the right and the rest in transverse colon. The total malignant case (n = 55) procedural success rate was 95% vs 100% for benign cases (P = 1.0, NS). Overall complication rate was significantly higher for benign group: Four complications were observed in the malignant group (stent migration, restenosis) vs 2 of 8 (25%) for benign obstruction (1-perforation, 1-stent migration) (P = 0.02). When stratifying complications of perforation and stent migration there was no significant difference between the two groups (P = 0.14, NS).

CONCLUSION

Colon SEMS remains a worthwhile option for colonic obstruction related to malignancy and has a high procedural and clinical success rate. Benign indications for SEMS placement appear to have similar success to malignant. While there appears to be a higher overall complication rate in benign cases, our study is limited by sample size. When evaluating for perforation alone there does not appear to be any significant difference between the two groups. SEMS placement may be a practical option for indications other that malignant obstruction. Interventional endoscopists should be aware and discuss the risk for complications in setting of benign conditions. Indications in these cases should be discussed in a multi-disciplinary fashion with colorectal surgery.

Systematic Review of Endoscopic Management of Stricture, Fistula and Abscess in Inflammatory Bowel Disease

Background: Interventional inflammatory bowel disease (IIBD) therapies can play a key role in inflammatory bowel disease (IBD) related stricture/fistula/abscess deferring or avoiding invasive surgery. Methods: A total of 112 studies pertaining to IIBD therapy for strictures/fistula/abscess between 2002 and December 2022 were included by searching Pubmed, Medline and Embase with a focus on technical/clinical success, recurrence, re-intervention and complications. Results: IIBD therapy for strictures include endoscopic balloon dilation (EBD), endoscopic stricturotomy (ES) and self-expanding metal stent (SEMS) placement. EBD is the primary therapy for short strictures while ES and SEMS can be used for refractory strictures. ES has higher long-term efficacy than EBD. SEMS is inferior to EBD although it can be useful in long, refractory strictures. Fistula therapy includes endoscopic incision and drainage (perianal fistula)/endoscopic seton (simple, low fistula) and endoscopic ultrasound-guided drainage (pelvic abscess). Fistulotomy can be done for short, superficial, single tract, bowel-bowel fistula. Endoscopic injection of filling agents (fistula plug/glue/stem cell) is feasible although durability is unknown. Endoscopic closure therapies like over-the-scope clips (OTSC), suturing and SEMS should be avoided for de-novo/bowel to hollow organ fistulas. Conclusion: IIBD therapies have the potential to act as a bridge between medical and surgical therapy for properly selected IBD-related stricture/fistula/abscess although future controlled studies are warranted.

Guidelines for endoscopic balloon dilation in treating Crohn's disease-associated small intestinal strictures (supplement to the Clinical Practice Guidelines for Enteroscopy)

Balloon-assisted enteroscopy allows endoscopic treatments in the deeper segments of the small bowel. Endoscopic balloon dilation has become a popular minimally invasive alternative for the treatment of Crohn's disease-associated small intestinal strictures. As a supplement to the Clinical Practice Guidelines for Enteroscopy, the Japan Gastroenterological Endoscopy Society's Working Committee has developed the present "Guidelines for endoscopic balloon dilation in treating Crohn's disease-associated small intestinal strictures," based on new scientific techniques and evidence. The guidelines cover standard procedures for the insertion route of the balloon endoscope, bowel preparation, indications, procedure-related complications, efficacy, target diameter and duration, management of multiple strictures, and the current state of combined and alternative treatments. Unresolved future research questions are also listed in this guideline.

Endoscopic Stenting for Inflammatory Bowel Disease Strictures

Strictures are among the most frequent complications in patients with Crohn's disease (CD), usually requiring a combined medical, surgical, and/or endoscopic approach to treatment. Currently, endoscopic balloon dilation (EBD) is the endoscopic treatment of choice, but its effectiveness is not universal, especially in the long term, and it is not free of complications. The technological evolution of stents in recent years has allowed their use in benign diseases of any origin and location, including inflammatory bowel disease (IBD). The current scientific evidence regarding the use of stents in strictures in IBD is limited and it should not be considered the first option in endoscopic treatment. Self-expandable metal stents (SEMS), but no biodegradable stents (BS), can work in cases that are refractory to anterior endoscopic treatment with EBD, in cases in which EBD is not possible, and in cases with strictures of greater length.

Recent Updates in Gastrointestinal Stent Placement from the Esophagus to the Colon: A Radiological Perspective

Fluoroscopic-guided stent placement has become an advantageous treatment option for diverse gastrointestinal disorders. In addition to palliative stent placement in patients with inoperable cancers, stenting has gradually expanded to other conditions, including as a bridge to surgery, as well as in patients' benign lesions and anastomotic strictures or leaks. This narrative review describes the indications, efficacy and safety of stent placement from the esophagus to the colon, including current recommendations, recent updates, and novel stents.

Futuristic Developments and Applications in Endoluminal Stenting

Endoscopic stenting is a well-established option for the treatment of malignant obstruction, temporary management of benign strictures, and sealing transmural defects, as well as drainage of pancreatic fluid collections and biliary obstruction. In recent years, in addition to expansion in indications for endoscopic stenting, considerable strides have been made in stent technology, and several types of devices with advanced designs and materials are continuously being developed. In this review, we discuss the important developments in stent designs and novel indications for endoluminal and transluminal stenting. Our discussion specifically focuses on (i) biodegradable as well as (ii) irradiating and drug-eluting stents for esophageal, gastroduodenal, biliary, and colonic indications, (iii) endoscopic stenting in inflammatory bowel disease, and (iv) lumen-apposing metal stent.

Colon stenting in benign diverticular stricture - a case report and review of literature

Background: Colonic stricture is a feared complication with varied etiology ranging from malignant obstruction to benign diseases. One such condition is recurrent diverticulitis-related strictures. Objectives & Methods: We report a case of a 48-year-old male patient with stricture of the sigmoid colon. The patient refused Sigmoid colon resection. He underwent stent placement and Two weeks later presented with constipation and abdominal discomfort. On Computed Tomography (CT) we discovered stent migration and consequent large bowel obstruction. Patient agreed on undergoing sigmoidectomy with a colostomy. Conclusion: Indication of SEMS for benign lesions remains unclear. Based on the current data, in benign colorectal obstructive lesions, SEMS is a viable option as a bridge to surgery when no other alternative option is available. However, the ASCRS 2020 guidelines did not point to SEMS as an option given the high rate of complications. Our patient was treated with a stent because he refused the resection surgery and found relief for a certain period before developing stent migration. Hence, the patients should be educated about the short and long-term potential effects of stenting before performing the procedure in benign strictures.

Benign Colonic Strictures

CASE SUMMARY

A 46-year-old man with no significant medical or surgical history presented to the emergency department with a 1-week history of worsening constipation, abdominal distension, nausea, and nonbloody, nonbilious emesis. Workup included a CT scan that was notable for a 5.3 × 3.9 cm "apple core-type" mass located within the sigmoid colon with proximal large-bowel dilation. Carcinoembryonic antigen was 1.4. No metastatic disease was seen on chest, abdominal, or pelvic CT scans. Flexible sigmoidoscopy identified a sigmoid colon mass 30 cm from the anal verge with near complete obstruction. Biopsies of the mass did not show evidence of dysplasia or malignancy. The Gastroenterology service declined to place a stent without a malignancy diagnosis. The patient subsequently underwent exploratory laparotomy, sigmoid colectomy, and end colostomy. Recovery was uneventful. Final pathology showed diverticulitis with abscess formation and no evidence of malignancy. A completion colonoscopy was unremarkable, and the patient underwent colostomy reversal 3 months later.

Endoscopic Management of Bowel Obstruction

The traditional morbidity and mortality associated with traditional management has stimulated exploration of endoscopic approaches. Success depends on patient selection, the location and etiology of obstruction, patient status, and the capability of the endoscopist. This article discusses techniques of intralumenal dilation and stent placement and results from systematic reviews.

Therapeutic effect of local photothermal heating of gold nanoparticle-coated self-expandable metallic stents for suppressing granulation tissue formation in the mouse colon

PURPOSE

To investigate the therapeutic effect of local photothermal (PT) heating on suppression of stent-induced granulation tissue formation in mouse colon.

MATERIALS AND METHODS

A gold nanoparticle (GNP)-coated self-expandable metallic stent (SEMS) was prepared using a two-step synthesis process for local PT heating under near-infrared laser irradiation. Twenty-four mice were randomly divided into two groups of 12 and subjected to SEMS placement in the colon. Group A received a GNP-coated SEMS without local heating and Group B received a GNP-coated SEMS and underwent local heating at 55°C after SEMS placement. The therapeutic effect of local heating was assessed by comparing the histopathological, immunohistochemical, and endoscopic results.

RESULTS

Four mice were excluded because of stent migration (n = 3, group B) or death (n = 1, group A). Stent-induced granulation tissue-related variables were significantly lower in group B than in group A (p < 0.001). In vivo endoscopic images, 4 weeks after stent placement, showed granulation tissue formation over the wire mesh in group A and relatively good patency of the stented colon with no definite irregularities in group B. There was more vascular endothelial growth factor (VEGF) positivity in group A than in group B.

CONCLUSION

Local PT heating suppresses granulation tissue formation after stent placement in mouse colon.

Uncovered self-expandable metal stents for the treatment of refractory benign colorectal anastomotic stricture

Self-expandable metal stent (SEMS) placement has been suggested as a therapeutic modality for treating benign colorectal strictures. Covered stents are generally used, given the concerns regarding the efficacy and safety of uncovered stents. Hence, few studies have evaluated the efficacy and safety of uncovered SEMSs (UCSEMSs) in patients with refractory benign colorectal anastomotic strictures. In this study, 12 patients with postoperative benign symptomatic anastomotic strictures refractory to pneumatic dilation (range, 2–9) and transient indwelling-covered SEMSs were treated using UCSEMS. All enrolled patients were men (mean age, 61 years). Stent placement was successful in all 12 patients, and early clinical success was achieved in 11 (92%) patients. Four patients (25%) showed successful clinical outcomes without further intervention, but eight patients (75%) were clinically unsuccessful, and showed stricture recurrence or functional obstructive symptoms. Three patients underwent surgery, and the remaining five patients required repeat stent procedures. Despite the high reobstruction rate, the median follow-up period after UCSEMS placement was 16.7 months, demonstrating that UCSEMS may be able to achieve medium-term symptom relief without any complications. Therefore, UCSEMS may be an alternative option in exceptional circumstances in carefully selected patients, where invasive surgical treatments, such as stoma diversion, are not an option, thereby improving patients’ quality of life.

Strictures in Crohn's Disease: From Pathophysiology to Treatment

Despite recent advances aimed to treat transmural inflammation in Crohn's disease (CD) patients, the progression to a structuring behavior still represents an issue for clinicians. As inflammation becomes chronic and severe, the attempt to repair damaged tissue can result in an excessive production of extracellular matrix components and deposition of connective tissue, thus favoring the formation of strictures. No specific and accurate clinical predictors or diagnostic tools for intestinal fibrosis exist, and to date, no genetic or serological marker is in routine clinical use. Therefore, intestinal fibrosis is usually diagnosed when it becomes clinically evident and strictures have already occurred. Anti-fibrotic agents such as tranilast, peroxisome proliferator-activated receptor gamma agonists, rho kinase inhibitors, and especially mesenchymal stem cell therapy have provided interesting results, but most of the evidence has been derived from studies performed in vitro. Therefore, current therapy of fibrotic strictures relies mainly on endoscopic and surgical procedures. Although its long-term outcomes may be debated, endoscopic balloon dilation appears to be the safest and most effective approach to treat appropriately selected strictures. The use of endoscopic stricturotomy is currently limited by the expertise needed to perform it and by the few data available in the literature. Some good results have been achieved by the positioning of self-expandable metal stents (SEMS). However, there is no concordance regarding the type of stent to use and for how long it should be left in place. The development of new specific SEMS may lead to better outcomes and to an increased use of this alternative in CD-related strictures.

Feasibility and safety of self-expandable metal stent in nonmalignant disease of the lower gastrointestinal tract

In recent years, self-expandable metal stents (SEMSs) have been employed to treat benign gastrointestinal strictures secondary to several conditions: Acute diverticulitis, radiation colitis, inflammatory bowel disease (IBD), and postanastomotic leakages and stenosis. Other applications include endometriosis and fistulas of the lower gastrointestinal tract. Although it may be technically feasible to proceed to stenting in the aforementioned benign diseases of the lower gastrointestinal tract, the outcome has been reported to be poor. In fact, in some settings (such as complicated diverticulitis and postsurgical anastomotic strictures), stenting seems to have a limited evidence-based benefit as a bridge to surgery, while in other settings (such as endometriosis, IBD, radiation colitis, etc.), even society guidelines are not able to guide the endoscopist through decisional algorithms for SEMS placement. The aim of this narrative paper is to review the scientific evidence regarding the use of SEMSs in nonmalignant diseases of the lower gastrointestinal tract, both in adult and pediatric settings.

Endoscopic Management of Benign Colonic Obstruction and Pseudo-Obstruction

There are a variety of causes of intestinal obstruction, with the most common cause being malignant diseases; however, volvulus, inflammatory bowel disease or diverticulitis, radiation injury, ischemia, and pseudo-obstruction can also cause colonic obstruction. These are benign conditions; however, delayed diagnosis of acute intestinal obstruction owing to these causes can cause critical complications, such as perforation. Therefore, high levels of clinical suspicion and appropriate treatment are crucial. There are variable treatment options for colonic obstruction, and endoscopic treatment is known to be a less invasive and an effective option for such. In this article, the authors review the causes of benign colonic obstruction and pseudo-obstruction and the role of endoscopy in treating them.

Role of endoscopic interventions and electroincision in benign anastomotic strictures following colorectal surgery

BACKGROUND/AIMS

The anastomotic strictures are one of the most common colorectal surgery complications, and various endoscopic techniques have been defined. Balloon dilation is the most well-known and the simplest procedure. In this article, we aimed to present our series of endoscopic interventions and electroincision management for anastomotic strictures.

MATERIALS AND METHODS

The files of 59 patients, who underwent colorectal surgery between January 2010 and September 2017 in our hospital and were diagnosed during the follow-up with anastomotic stricture, were analyzed. The outcomes of endoscopic interventions such as balloon dilation and electroincision were compared and reported.

RESULTS

The mean age of the 59 patients included in the study was 59.5±16.26 years. The primary operative indications were colorectal cancer in 46, inflammatory bowel disease in 7, diverticulum in 5, and penetrating trauma in one patient. Single- or multiple-balloon dilations were successful in 48 patients. Electroincision was performed in 11 patients because of the balloon dilation failure. None of the patients needed a secondary surgery. During the mean 33.75 months of the follow-up, the stricture recurred in seven patients who had undergone balloon dilation. Repeated balloon dilation was successful in these patients without any need for an additional surgical intervention.

CONCLUSION

Balloon dilation can be performed safely as the primary treatment option, because of its easy access and noninvasive application. Electroincision is also a safe and effective endoscopic technique that can be preferred especially when the balloon dilation fails.

Current status of colonic stent for obstructive colorectal cancer in Japan; a review of the literature

Colorectal cancer is the most common cancer in Japan. Approximately 10%-20% of the patients with colorectal cancer present with large bowel obstruction, and those who present with malignant colonic obstruction (MCO) require urgent decompression because MCO can cause electrolytic fluid imbalance, colonic necrosis, bacterial translocation, and death. Placement of colonic stents (self-expandable metallic stents) for MCO is a major and standard endoscopic treatment that has been available since 2012 in Japan. This review presents the current conditions and future prospects of this procedure based on the literature. The current indication of colonic stent placement is malignant colorectal stenosis. One of the purposes of using stents is palliative treatment; further, its advantages over emergency surgery with colostomy include avoidance of colostomy, relief of obstruction, shorter hospitalization, and better quality of life. In addition, stent placement can also be used as a bridge to surgery since the duration of the hospitalization is shorter and postoperative complications, colostomy rates, and mortality rates are lower with elective than with emergency surgery. Although recent studies have reported low complication rates related to colonic stents, complications may still occur, highlighting the importance of good preparation, adequate staffing, backup systems, and informed consent. The current major problem related to colonic stents is the lack of evidence on patients' long-term prognoses for bridge to surgery purposes, awaiting the results of ongoing clinical research.

Inverted "upside-down" esophageal fully-covered self-expanding metal stent is effective for temporary treatment of colorectal strictures: a pilot case series

Background and study aims  Placement of a fully-covered self-expanding metal stent (FC-SEMS) is a valid alternative for benign and malignant colorectal strictures treatment. Despite the reportedly high technical success rate, stenting is still challenging, due to high rates of adverse events. Migration still represents the main issue, although several anti-migration systems have been proposed. Patients and methods  Before insertion, esophageal Beta Niti-S FC-SEMSs were inverted and reloaded on the deployment device to invert the proximal and distal parts of the stent, with the largest end placed above the stricture to contrast peristaltic activity. The inverted "upside-down" Beta Niti-S FC-SEMS was placed in five consecutive patients: four pts with benign anastomotic stricture unresponsive to repeated balloon dilation and persisting for at least 10 weeks, and one with malignant rectal neoplasia. In five patients, six inverted FC-SEMSs were placed. Results  The modified FC-SEMS did not migrate in 5/6 cases (83 %). Stent migration occurred in the neoplastic case, induced by neoadjuvant chemotherapy. The "upside-down" esophageal Beta Niti-S FC-SEMS stayed in place for an average of 6 weeks, achieving resolution of stricture in all patients but one, who required an additional stent placement, due to incomplete stricture resolution after 6 weeks. Conclusion  The inverted esophageal Beta Niti-S FC-SEMSs proved to be effective in treating colorectal stricture in all cases, with no spontaneous migration or significant side effects, and achieved resolution of strictures where a traditional approach, recommended by guidelines, failed.

Role of interventional inflammatory bowel disease in the era of biologic therapy: a position statement from the Global Interventional IBD Group

Interventional (or therapeutic) inflammatory bowel disease (IBD) endoscopy has an expanding role in the treatment of disease and surgical adverse events. Endoscopic therapy has been explored and used in the management of strictures, fistulas/abscesses, colitis-associated neoplasia, postsurgical acute or chronic leaks, and obstructions. The endoscopic therapeutic modalities include balloon dilation, stricturotomy, stent placement, fistulotomy, fistula injection and clipping, sinusotomy, EMR, and endoscopic submucosal dissection. With a better understanding of the disease course of IBD, improved long-term impact of medical therapy, and advances in endoscopic technology, we can foresee interventional IBD becoming an integrated part of the multidisciplinary approach to patients with complex IBD.

Stent experiences in emergency conditions in acute mechanical intestinal obstruction caused by colorectal cancer

INTRODUCTION

Stent treatment can be applied to avoid surgery in surgically risky patients or to turn a high-risk emergency operation into a lower-risk elective operation and save time.

AIM

In this study, the techniques, clinical efficacy, safety and complications of endoscopic stents applied in emergency conditions were evaluated in patients with acute mechanical intestinal obstruction (AMIO) due to colorectal cancer.

MATERIAL AND METHODS

Between 2013 and 2015, 23 patients with an average age of 69.5 ±13.5 years who presented with AMIO and anastomosis stenosis secondarily to cancer to the emergency department were subjected to stent treatment under emergency conditions.

RESULTS

Thirteen (56.5%) patients were diagnosed with colon cancer, 5 (21.7%) with rectal cancer, and 5 (21.7%) with stenosis in the previous anastomosis line. Fourteen (60.9%) patients were diagnosed with stage 4 cancer, 7 (30.4%) with stage 3 cancer and 2 (8.7%) with stage 2 cancer. The stents were applied to the sigmoid colon in 10 (43.5%) patients, to the recto-sigmoid area in 9 (39.1%) patients and to the rectum area in 4 (17.4%) patients. While 14 (60.9%) patients had local or locally advanced disease, 9 (39.1%) patients had metastases in different parts of their bodies, particularly in their livers.

CONCLUSIONS

The study demonstrates that stents offer a favorable therapeutic alternative to emergency surgery and are associated with promising short-term outcomes as well as an acceptable safety profile for AMIO.

Self-expanding metal stent restenosis in obstructive colon diverticulitis mimicking colon cancer: A case report

INTRODUCTION

The self-expanding metal stent (SEMS) has been used in malignant colorectal obstruction as a bridge to surgery or for palliative treatment. We report a case of obstructive descending colon diverticulitis in-stent restenosis, which is difficult to distinguish from colon cancer.

PRESENTATION OF CASE

A 48-year-old man presented with abdominal pain. Computed tomography demonstrated a segment of thickened wall in the descending colon with near-complete obstruction. Colonoscopy revealed stenosis over the entire circumference of the descending colon. Biopsy revealed no malignant findings. SEMS was inserted to improve bowel obstruction. However, bowel obstruction did not improve, and stent-in-stent insertion was performed. Because colon cancer could not be completely excluded, left hemicolectomy with lymph node dissection was performed. The pathological examination revealed colon diverticulitis and no malignant finding.

DISCUSSION

Benign colorectal diseases can present with symptoms similar to those of obstructive colorectal cancer. As a result, it was benign colorectal stenosis, but it was thought that resection should be considered when the malignant lesion is suspected. The use of SEMS in benign colorectal disease has been reported a few. Reinsertion of the stent for restenosis, in bridge to surgery, was also considered useful from the viewpoint of avoiding emergent operation and reducing complications.

CONCLUSION

For colon stenosis suspected of malignant disease, it was thought that resection by inserting SEMS should be taken into consideration even for benign disease as a result.

Laparoscopic approaches to complicated diverticulitis

BACKGROUND

The objective of this article is to review the evolving role of laparoscopic surgery in the treatment of complicated diverticulitis.

PURPOSE

The authors attempted to give readers a concise insight into the evidence available in the English language literature. This study does not offer a systematic review of the topic, rather it highlights the role of laparoscopy in the treatment of complicated diverticulitis.

CONCLUSIONS

New level 1 evidence suggest that observation rather than elective resection following nonoperative management of diverticulitis with abscess and/or extraluminal air is not below the standard of care. Implementation of nonoperative management may result in increased prevalence of sigmoid strictures.

The role of stents in the management of colorectal complications: a systematic review

BACKGROUND

Complications in colorectal surgery include a wide range of clinical conditions, which increase mortality, morbidity, hospital stay and costs. In some cases, the placement of a self-expanding metal stent may represent a possible therapeutic strategy, avoiding further surgery.

METHODS

In order to verify the feasibility and safety of the technique, we reviewed the medical literature, between January 1997 and 2015, selecting 32 studies. Inclusion criteria were based on Preferred Reporting Items for Systematic reviews and Meta-Analyses recommendations.

RESULTS

The estimated rate of early success was 73.3% (95% CI 66.3-79.3), raising from 25 to 68% in the time frame 1997-2007. The rate of early complications was 31.4% (95% CI 25.3-38.3%), progressively decreasing from 75 to 43% up to 2009. The rate of surgery for acute complication was 9.3% (95% CI 6.0-14.2%), reduced on time course from 25 to 9%. The rate of closure of dehiscence was 74.5% (95% CI 62.8-83.5%), while the rate of long-lasting success was 57.3% (95% CI 50.3-64.0%).

CONCLUSIONS

Endoscopic stenting in the early postoperative management of anastomotic complications after colorectal surgery should be considered in patients with minimal risk for sepsis, as a safe and often effective alternative to surgery. However, in order to establish the safety and efficacy of this technique, prospective studies involving a larger cohort of patients are required.

Biodegradable Stents: An Evolution in Management of Benign Intestinal Strictures

Benign intestine strictures secondary to postoperative narrowing or inflammatory bowel disease can be managed surgically or conservatively. Some patients may not be suitable surgical candidates and some patients may choose not to have repeat surgery. Biodegradable (BD) stents offer a prolonged dilatory effect before gradual degradation and obviates the need of a second procedure for stent removal. BD stents have high technical success rates (mean, 94.4%; median, 100%; range, 86% to 100%) but widely variable clinical success rates (range, 45% to 100%). Stent migration is the most commonly reported complication (mean, 22.2%; range, 0% to 36%). In the future, with better understanding of the factors contributing to stent migration, improvement in present stent design and better anchoring techniques, the stent migration rate is expected to decrease and improve clinical outcome. The role of prophylactic BD stent placement to prevent stricture development postintestine surgery is an intriguing idea and needs to be explored. As of now, the use of BD stents is a reasonable option for patients with dilatation resistant intestinal strictures who are unfit for surgery or refuse to have surgical treatment.

Predictors of outcome for endoscopic colorectal stenting: a decade experience

PURPOSE

Endoscopic stenting is used with increasing frequency to treat colorectal conditions. Little is known about what influences outcome. This study aimed to determine the impact of various factors on the short- and long-term results of colorectal stenting.

METHODS

A retrospective review was conducted of all endoscopic stenting procedures performed by a colorectal surgeon at a tertiary referral institution between 2003 and 2013. Main outcome measures included technical success, clinical success, complications, and predictors of outcome.

RESULTS

Of the stent procedures, 183 were performed in 165 patients. The majority of patients (90 %) presented with a malignant obstruction (intrinsic colonic vs. extrinsic non-colonic). Carcinomatosis was present in 22 % of patients with malignancy, and it was associated with lower technical success compared to non-carcinomatosis (adjusted odds ratio [AOR] 0.2 [95 % confidence interval (CI) 0.1-0.8]; p = 0.021). Colonic malignancy was associated with higher clinical success compared to non-colonic malignancy (AOR 3.8 [95 % CI 1.4-10.3]; p = 0.009). Carcinomatosis increased the risk of complications compared to non-carcinomatosis (AOR 3.2 [95 % CI 1.0-10.0]; p = 0.049). The risk of complication was higher when a stent was deployed in the rectum compared to the colon (AOR 4.1 [95 % CI 1.5-11.7]; p = 0.008). The use of a covered stent was associated with higher complication rate compared to a non-covered stent (AOR 13.6 [95 % CI 2.6-71.2]; p = 0.002). Balloon dilation was associated with an increased risk of complications (AOR 4.6 [95 % CI 1.3-16.2]; p = 0.017).

CONCLUSIONS

Carcinomatosis was associated with lower technical success rate. Clinical success was higher in patients with a primary colonic malignancy. The use of a covered stent, balloon dilation of stricture, lesions in the rectum, and carcinomatosis were associated with higher risk for complications.

Use of covered self-expandable stents for benign colorectal disorders in children

PURPOSE

There is a lack of experience with covered self-expandable stents for benign colorectal disorders in children.

METHODS

Five children (4M, 1F) with a median age of 5years (range, 6months-9years) who underwent treatment with covered self-expandable plastic (SEPSs) or self-expandable metal stents (SEMSs) for a benign colorectal condition between April 2005 and November 2013 were recruited to this retrospective study. Etiologies included: anastomotic stricture with (n=1) or without (n=3) simultaneous enterocutaneous fistula, as well as an anastomotic leak associated with enterocutaneous fistula (n=1). All children suffered from either Hirschsprung's disease (n=3) or total colonic aganglionosis (Zuelzer-Wilson syndrome) (n=2).

RESULTS

Median duration of individual stent placement was 23days (range, 1-87days). In all cases up to five different stents were placed over time. At follow-up two patients were successfully treated without further intervention. In another patient the anastomotic stricture resolved fully, but a coexisting enterocutaneous fistula persisted. Overall, three patients did not improve completely following stenting and required definite surgery. Stent-related problems were noted in all cases. There was one perforation of the colon at stent insertion. Further complications consisted of stent dislocation (n=4), obstruction (n=1), formation of granulation tissue (n=1), ulceration (n=1) and discomfort (n=3).

CONCLUSIONS

Covered self-expandable stents enrich the armamentarium of interventions for benign colorectal disorders in children including anastomotic strictures and intestinal leaks. A stent can be applied either as an emergency procedure (bridge to surgery) or as an adjuvant treatment further to endoscopy and dilatation. Postinterventional problems are frequent but there is a potential for temporary or definite improvement following stent insertion.

Surgery or stenting for colonic obstruction: A practice management guideline from the Eastern Association for the Surgery of Trauma

BACKGROUND

Colonic obstruction is a surgical emergency, and delay in decompression results in added morbidity and mortality. Advances have led to less invasive procedures such as stenting as a bridge for definitive surgery. The aim of this article was to perform a systematic review regarding colon obstruction (malignant or benign) and to provide recommendations following the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) framework.

METHODS

A systematic literature review was conducted using the PubMed, EMBASE, and the Cochrane Library databases of published studies. The search was last performed on January 2, 2015. Two independent reviewers extracted the desired variables from the studies. For our meta-analysis, we used Review Manager X.6 (RevMan). Recommendations are provided using GRADE methodology. A single POPULATION, Intervention, Comparator, Outcome (PICO) question with two outcomes was addressed as follows:

POPULATION

in adult patients with a colonic obstruction (malignant or benign).

INTERVENTION

should surgery be performed.Comparator: versus endoscopic stenting.

OUTCOMES

decreased mortality and decreased emergency, nonplanned procedures?

RESULTS

The search yielded 210 results. Screening of the titles excluded 102 articles, leaving 108 for review. After abstract review, 71 additional articles were excluded because of failure to address the PICO questions of this guideline. Thirty-seven articles were reviewed in their entirety, of those six randomized control trials that evaluated the use of stents versus emergency surgery in colonic obstruction caused by malignant disease were included in the final qualitative review.

CONCLUSION

We conditionally recommend endoscopic, colonic stenting (if available) as initial therapy for colonic obstruction. In our review, stent use was associated with decreased mortality and rates for emergency, nonplanned procedures to include reoperations. This conditional recommendation is limited to those with malignancy because of the lack of literature supporting this practice in benign colonic disease.

Self-Expanding Metal Stenting in the Management of a Benign Colonic Stricture

Colonic postanastomotic strictures occur in 1.5–8% of patients following colorectal surgery. Traditionally, colonic strictures were treated by multiple modalities including endoscopic dilatation. Self-expanding metal stents (SEMS) have been indicated in the management of benign colonic strictures; however, there are limited available data with regard to their efficacy. We present the case of a 68-year-old male who had perforated sigmoid diverticulitis followed by Hartmann's procedure with eventual reanastomosis 6 months later. He subsequently developed benign colonic stricture, which was treated with a metal stent. SEMS are associated with a low mortality rate and are appropriate in treating acute colonic obstruction as a result of benign stricture in the setting of postanastomosis.

The role of stents in the treatment of Crohn's disease strictures

BACKGROUND AND AIMS

Stenosis is one of the most frequent local complications in Crohn's disease (CD). Surgery is not the ideal treatment because of the high rate of postoperative recurrence. Endoscopic balloon dilation (EBD) currently is the current treatment of choice for short strictures amenable to the procedure. However, it is not applicable or effective in all the cases, and it is not without related complications. Our goal was to summarize the published information regarding the use and the role of the stents in the treatment of CD stricture. A Medline search was performed on the terms "stricture," "stenosis," "stent" and "Crohn's disease."

RESULTS

a total of 19 publications met our search criteria for an overall number of 65 patients. Placing a self-expanding metal stent (SEMS) may be a safe and effective alternative to EBD and/or surgical intervention in the treatment of short stenosis in patients with CD. Indications are the same as those for EBD. In addition, SEMS may be useful in stenosis refractory to EBD and may be suitable in the treatment of longer or more complex strictures that cannot be treated by EBD. With the current information, it seems that the best treatment option is the placement of a fully covered stent for a mean time of 4 weeks. Regarding the use of biodegradable stents, the information is limited and showing poor results.

CONCLUSIONS

the use of stents in the treatment of strictures in CD should be taken into account either as a first endoscopic therapy or in case of EBD failure.

Fully covered self-expandable metal stent in the treatment of postsurgical colorectal diseases: outcome in 29 patients

BACKGROUND

Self-expandable metal stent (SEMS) placement is a minimally invasive treatment for palliation of malignant colorectal strictures and as a bridge to surgery. However, the use of SEMS for benign colorectal diseases is controversial. The purpose of this retrospective study is to evaluate the efficacy and safety of fully covered SEMS (FCSEMS) placement in postsurgical colorectal diseases.

METHODS

From 2008 to 2014, 29 patients with 32 FCSEMS deployment procedures were evaluated. The indications for stent placement were: 17 anastomotic strictures (3/17 presented complete closure of the anastomosis); four anastomotic leaks; seven strictures associated with anastomotic leak; and one rectum-vagina fistula.

RESULTS

Clinical success was achieved in 18 out of 29 patients (62.1%) being symptom-free at an average of 19 months. In the remaining 11 patients (37.9%), a different treatment was needed: four patients required multiple endoscopic dilations, 4 patients colostomy confection, one patient definitive ileostomy and three patients revisional surgery. The FCSEMS were kept in place for a mean period of 34 (range: 6-65) days. Major complications occurred in 12 out of 29 patients (41.4%) and consisted of stent migration. Minor complications included two cases of transient fever, eight cases of abdominal or rectal pain, and one case of tenesmus.

CONCLUSION

FCSEMS are considered a possible therapeutic option for treatment of postsurgical strictures and leaks. However, their efficacy in guaranteeing long-term anastomotic patency and leak closure is moderate. A major complication is migration. The use of FCSEMS for colonic postsurgical pathologies should be carefully evaluated for each patient.

Stents for colorectal obstruction: Past, present, and future

Since the development of uncovered self-expanding metal stents (SEMS) in the 1990s, endoscopic stents have evolved dramatically. Application of new materials and new designs has expanded the indications for enteral SEMS. At present, enteral stents are considered the first-line modality for palliative care, and numerous types of enteral stents are under development for extended clinical usage, beyond a merely palliative purpose. Herein, we will discuss the current status and the future development of lower enteral stents.

Management of diverticular disease

Diverticular disease is a common condition in Western countries and the incidence and prevalence of the disease is increasing. The pathogenetic factors involved include structural changes in the gut that increase with age, a diet low in fibre and rich in meat, changes in intestinal motility, the concept of enteric neuropathy and an underlying genetic background. Current treatment strategies are hampered by insufficient options to stratify patients according to individual risk. One of the main reasons is the lack of an all-encompassing classification system of diverticular disease. In response, the German Society for Gastroenterology and Digestive Diseases (DGVS) has proposed a classification system as part of its new guideline for the diagnosis and management of diverticular disease. The classification system includes five main types of disease: asymptomatic diverticulosis, acute uncomplicated and complicated diverticulitis, as well as chronic diverticular disease and diverticular bleeding. Here, we review prevention and treatment strategies stratified by these five main types of disease, from prevention of the first attack of diverticulitis to the management of chronic complications and diverticular bleeding.

Clinical efficacy of endoscopic treatment for benign colorectal stricture: balloon dilatation versus stenting

BACKGROUND/AIMS

There has been a lack of research comparing balloon dilatation and self-expandable metal stent (SEMS) placement to determine which is better for long-term clinical outcomes in patients with benign colorectal strictures. We aimed to compare the clinical efficacy and complication rates of balloon dilatation and SEMS placement for benign colorectal strictures from a variety of causes.

METHODS

Between January 1999 and January 2012, a total of 43 consecutive patients who underwent endoscopic treatment for benign colorectal stricture (balloon only in 29 patients, SEMS only in seven patients, and both procedures in seven patients) were retrospectively reviewed.

RESULTS

Thirty-six patients underwent endoscopic balloon dilatation, representing 65 individual sessions, and 14 patients received a total of 17 SEMS placements. The initial clinical success rates were similar in both groups (balloon vs SEMS, 89.1% vs 87.5%). Although the reobstruction rates were similar in both groups (balloon vs SEMS, 54.4% vs. 57.1%), the duration of patency was significantly longer in the balloon dilatation group compared with the SEMS group (65.5±13.3 months vs. 2.0±0.6 months, p=0.031).

CONCLUSIONS

Endoscopic balloon dilatation is safe and effective as an initial treatment for benign colorectal stricture and as an alternative treatment for recurrent strictures.

Techniques and principles of endoscopic treatment of benign gastrointestinal strictures

PURPOSE OF REVIEW

The fundamental goal of treating any stenosis is luminal enlargement to ameliorate the underlying obstructive symptoms. Symptoms depend on the etiology and the site of the stricture and may include dysphagia, nausea and vomiting, abdominal pain, obstipation, or frank bowel obstruction. This article compares the various current technologies available for the treatment of gastrointestinal stenoses with regard to ease and site of application, patient tolerance, safety and efficacy data, and cost-benefit ratio.

RECENT FINDINGS

Recent studies indicate that gastrointestinal dilation and stenting have evolved to a point at which in many if not most situations they can be the first line therapy and potentially the final therapy needed to treat the underlying condition.

SUMMARY

Following techniques and principles in the management of gastrointestinal strictures would allow for the well tolerated and effective treatment of most patients with the tools currently available today.

Gastrointestinal stenting: Current status and imaging features

The use of stents in the gastrointestinal tract has been subjected to major changes. Initially, the use of stents was restricted to malignant strictures in patients with metastatic disease. But thanks to reduction of the morbidity and mortality rates, they are now used with curative intention and in patients with benign diseases after careful selection. However, for patients presenting with colon obstruction due to an advanced colon carcinoma, the mortality and morbidity are still high. The purpose of this review is to provide an overview of indications, techniques and further developments of the stents in the gastrointestinal tract and to highlight the predominant role of multidetector row computed tomography (MDCT) in the detection of potential complications.

Colonic obstruction caused by endometriosis solved with a colonic stent as a bridge to surgery

Self-expanding metal stents are an established treatment for malignant colon strictures, either as palliative treatment or as a bridge to later surgery. Little data exist regarding the use of stents for benign obstructions and the rate of subsequent complications related to the procedure is high. After reviewing the existing literature, we found only one case of stent placement in an intestinal obstruction caused by endometriosis, as a bridge to surgery. The use of prostheses in benign disease has a higher rate of complications such as stent migration and gut perforation. Such complications are even more likely to happen when the stent has been placed as a bridge to surgery and it is delayed for more than 7 days. This is the case of a young woman presenting an acute intestinal obstruction related to endometrioma. Stent placement was used in this case as a bridge to surgery with successful results.

Endoscopic stenting for recurrence-related colorectal anastomotic site obstruction: Preliminary experience

AIM: To evaluate the efficacy of stents in treating patients with anastomotic site obstructions due to cancer recurrence following colorectal surgery.

METHODS: The medical records of patients who underwent endoscopic self-expanding metal stents (SEMS) insertion for colorectal obstructions between February 2004 and January 2014 were retrospectively reviewed. During the study period, a total of 218 patients underwent endoscopic stenting for colorectal obstructions. We identified and examined the patients who underwent endoscopic stenting for obstructions caused by cancer recurrence at the anastomotic site following colorectal surgeries for primary colorectal cancer.

RESULTS: Five consecutive patients [mean age, 56.4 years (range: 39-82 years); 4 women, 1 man] underwent endoscopic stenting for obstructions caused by cancer recurrence at the anastomotic site following colorectal surgeries for primary colorectal cancer. Technical and clinical success was achieved in all 5 patients, without any early complications. During follow-up, 3 patients did not need further intervention, prior to their death, after the first stent insertion; thus, the overall success rate was 3/5 (60%). Perforations occurred in 2 patients who required a second SEMS insertion due to re-obstruction; none of the patients experienced stent migration.

CONCLUSION: SEMS placement is a promising treatment option for patients who develop obstructions of their colonic anastomosis sites due to cancer recurrence.

Fully covered self-expanding metal stents for refractory anastomotic colorectal strictures

BACKGROUND

Some patients with benign colorectal obstruction do not respond to endoscopic balloon dilation. Fully covered self-expandable metal stents (FCSEMSs) have several potential advantages over non-covered stents, including a higher likelihood of retrieval owing to limited local tissue reaction. However, the efficacy and safety of FCSEMSs in benign colorectal strictures have not yet been established.

METHODS

Retrospective analysis of prospectively collected data concerning patients with post-surgical benign symptomatic anastomotic colorectal strictures, refractory to endoscopic dilation and in whom FCSEMSs had been placed at our center. Technical success was defined as successful stent placement and deployment at the stricture site. Early clinical success was defined as symptom relief persisting at least for 3 days. Follow-up was based on monthly clinical evaluation and quarterly endoscopic assessment. Endoscopic stent removal was planned on the basis of clinical or endoscopic assessment. Prolonged clinical success was defined as persistent symptom relief during follow-up.

RESULTS

Technical and early clinical success were obtained in 16 of 16 (100%) patients. The median follow-up was 21 months. Prolonged clinical success was achieved in 9/16 (56%) cases. There was no major complication, including perforation and bleeding. Stent migration occurred in 3 (19%) cases, in two of them associated with clinical failure. The median stent diameter was significantly higher in patients with successful than in those with unsuccessful clinical outcome (26 vs. 20 mm, P = 0.006). The clinical success rate was 1/6 (17%) in patients who received a 20-22 mm stent and 8/10 (80%) in those who received a 24-26 mm stent, respectively (P = 0.035).

CONCLUSIONS

FCSEMSs can represent effective and safe treatment for refractory anastomotic colorectal strictures. Large diameter stents are warranted for better results.

Palliative self-expandable metal stents for acute malignant colorectal obstruction: clinical outcomes and risk factors for complications

OBJECTIVE

Self-expandable metal stents (SEMSs) have been used as palliative treatment or bridge to surgery for obstructions caused by colorectal cancer (CRC). We assessed the long-term outcomes of palliative SEMSs and evaluated the risk factors influencing complications.

MATERIALS AND METHODS

One hundred and seventy-five patients underwent SEMS placement for acute malignant colorectal obstruction. Of the 72 patients who underwent palliative treatment for primary CRC, 30 patients received chemotherapy (CT) for primary cancer (CT group) and 42 underwent best supportive treatment (BST) without CT (BST group).

RESULTS

There was a significant difference in late migration between the CT group and the BST group (20.0% in CT group, 2.4% in BST group, p = 0.018). Response to CT influenced the rate of late obstruction (0% in disease control, 35.7% in disease progression, p = 0.014). However, late obstruction was not associated with stent properties, such as diameter or type (≤22 mm vs. >22 mm, 13.5% vs. 14.3%, p = 1.00; uncovered stent vs. covered stent, 15.5% vs. 7.1%, p = 0.675) and migration (≤22 mm vs. >22 mm, 16.2% vs. 2.9%, p = 0.108; uncovered stent vs. covered stent, 8.6% vs. 14.3%, p = 0.615) in palliative SEMS.

CONCLUSION

The administration of CT increases the rate of stent migration, and disease control by CT can reduce the risk of obstruction by maintaining the luminal patency of palliative SEMSs.

Uncovered Self-Expanding Metal Stent (SEMS) Four Years After Placement for Long-Term Treatment of a Benign Colonic Obstruction

Self-expanding metal stents (SEMS) have emerged as an alternative to surgery in the treatment of malignant colorectal obstructions. There is limited data about their use for benign colonic obstructions, especially in regards to safety and long-term patency. We present a case in which long-term SEMS placement proved to be a durable option for over 4 years in a patient with a benign colonic stricture.

Perforation in colorectal stenting: a meta-analysis and a search for risk factors

BACKGROUND

Recent studies suggest that there is a substantial risk of perforation after colorectal stent placement.

OBJECTIVE

To identify risk factors for perforation from colonic stenting.

DESIGN

A meta-analysis of 86 studies published between 2005 and 2011.

SETTING

Multicenter review.

PATIENTS

All patients who underwent colorectal stent placement.

INTERVENTION

Colorectal stent placement.

MAIN OUTCOME MEASUREMENTS

The occurrence of perforation with subgroup analyses for stent design, stricture etiology, stricture dilation, and concomitant chemotherapy, including the use of bevacizumab.

RESULTS

A total of 4086 patients underwent colorectal stent placement; perforation occurred in 207. Meta-analysis revealed an overall perforation rate of 7.4%. Of the 9 most frequently used stent types, the WallFlex, the Comvi, and the Niti-S D-type had a higher perforation rate (>10%). A lower perforation rate (<5%) was found for the Hanarostent and the Niti-S covered stent. Stenting benign strictures was associated with a significantly increased perforation rate of 18.4% compared with 7.5% for malignant strictures. Dilation did not increase the risk of perforation: 8.5% versus 8.5% without dilation. The subgroup of post-stent placement dilation had a significantly increased perforation risk of 20.4%. With a perforation rate of 12.5%, bevacizumab-based therapy was identified as a risk factor for perforation, whereas the risk for chemotherapy without bevacizumab was 7.0% and not increased compared with the group without concomitant therapies during stent therapy (9.0%).

LIMITATIONS

Heterogeneity; a considerable proportion of data is unavailable for subgroup analysis.

CONCLUSIONS

The perforation rate of colonic stenting is 7.4%. Stent design, benign etiology, and bevacizumab were identified as risk factors for perforation. Intraprocedural stricture dilation and concomitant chemotherapy were not associated with an increased risk of perforation.