Endoscopic Stenting in GI Disease
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Direct answer
A self-expanding metal stent can reopen a malignant gastrointestinal obstruction without a single incision, and three sites carry the technique: the oesophagus (palliation of malignant dysphagia, and covered stents sealing fistulae and perforations), the duodenum and gastric outlet (malignant gastric outlet obstruction, where stenting allows faster return to oral intake and shorter hospital stay than surgical gastrojejunostomy, at the price of more reinterventions), and the colon (left-sided malignant obstruction used as a bridge to elective one-stage resection — sparing the patient a stoma — or as palliation in the unfit). Uncovered stents resist migration but permit tumour in-growth; covered stents resist in-growth and seal fistulae but migrate more; stents crossing the gastro-oesophageal junction cause reflux. The feared complications — migration, perforation (colonic rates commonly quoted around 4-10%), bleeding, tumour overgrowth and food impaction — define consent. Benign stricttures refractory to dilatation take fully covered removable stents, accepting high migration and repeat procedures.
What you must remember
- Oesophageal stenting: first-line palliation of malignant dysphagia in unresectable disease; covered stents close tracheo-oesophageal fistulae; crossing the gastro-oesophageal junction creates reflux — head-up sleeping, proton pump inhibitor, small meals.
- Gastric outlet obstruction: duodenal self-expanding stents versus laparoscopic gastrojejunostomy — stents win short-term (intake, stay) and lose on durability (reintervention), so expected survival shapes the choice per guideline reasoning.
- Colonic stenting as bridge to surgery: for obstructing left-sided cancer in a fit patient, stenting converts an emergency into a semi-elective resection with primary anastomosis and a lower stoma rate; right-sided obstruction goes straight to resection; palliative stenting serves the metastatic or unfit.
- Covered versus uncovered: uncovered — firm anchorage, tumour in-growth; (fully) covered — resists in-growth, seals leaks, migrates; partially covered stents sit between.
- Perforation discipline: avoid balloon predilation of malignant stricttures before stenting — predilation raises perforation risk; fluoroscopic guidance and post-procedure imaging are standard.
- Complication list for consent: migration, perforation, bleeding, tumour ingrowth or overgrowth, food impaction, restenosis, and tenesmus or incontinence with distal rectal stents.
- Benign disease: fully covered removable stents for refractory benign oesophageal strictures and for sealing leaks — temporary by design, repeated by necessity.
- When not to stent: free perforation with peritonitis, multilevel obstruction from peritoneal carcinomatosis, very long or angulated strictures, and uncorrectable coagulopathy — each pushes to surgery or conservative palliation.
Two pathways that show the reasoning
A 74-year-old with an obstructing sigmoid cancer and mild dilatation, on anticoagulants for heart disease: stent first — a bridge to optimisation — then staging CT, cardiac clearance, and a laparoscopic resection with primary anastomosis two weeks later; the patient goes home without a stoma, which is the entire point of the bridge strategy. Contrast a 65-year-old with pancreatic cancer and vomiting from duodenal invasion, possibly with biliary obstruction too: a combined endoscopic session — duodenal stent and biliary stent — restores eating and drains bile in one anaesthetic-free sitting, suiting a prognosis measured in months; the surgical gastrojejunostomy alternative is reserved for the fitter patient with longer expected survival. Same device, opposite strategies — palliation buys comfort, bridge buys time for cure.
Where students slip
The covered-versus-uncovered MCQ is missed in both directions: remember migration (covered) versus ingrowth (uncovered) as the trade. Students forget that colonic stenting's prize is the avoided stoma and one-stage resection, quoting only "relief of obstruction". The GOO question is a classic compare-and-contrast — faster intake and shorter stay for stents, fewer reinterventions for surgery — and both arms must be stated. Finally, the technique point examiners extract: no balloon predilation across tumour before stenting, because perforation is the catastrophic result.
Frequently asked questions
Which stent type seals a tracheo-oesophageal fistula?
A covered (fully covered) self-expanding metal stent, whose membrane bridges the defect. Uncovered stents cannot seal fistulae.
What is the purpose of colonic stenting as a bridge to surgery?
To decompress an obstructing left colon cancer, allowing staging and optimisation before a semi-elective one-stage resection. It substantially lowers stoma rates.
What are the main complications of GI stenting?
Migration, perforation, bleeding, tumour ingrowth or overgrowth, and food impaction. Colonic perforation, quoted around 4-10%, is the most feared.
How do duodenal stents compare with gastrojejunostomy?
Stents give faster return to oral intake and shorter hospital stay; surgery gives longer durability with fewer reinterventions. Expected survival decides.
Why is balloon predilation avoided before tumour stenting?
Because dilating a tumour-bearing stricture sharply raises perforation risk. The self-expanding stent applies gradual radial force instead.