Anastomotic stricture
Formal Definition
Anastomotic stricture — an abnormal narrowing at the site of a surgical intestinal or vascular anastomosis, occurring weeks to months (occasionally years) after the operation, caused by scar tissue formation, fibrotic healing, ischemia, or (less commonly) recurrence of the underlying disease (malignancy, Crohn's inflammation); typically presents with progressive obstructive symptoms specific to the level of the stricture (dysphagia for esophageal anastamoses, vomiting for gastric/small bowel, obstipation and large bowel symptoms for colorectal, limb ischemia for vascular), diagnosed by contrast study, endoscopy, or cross-sectional imaging, and treated by mechanical dilation, endoscopic stenting, or revision surgery.
How It's Used on the Ward
"Anastamotic stricture" or "anastomosis narrowed" — when an intestinal reconnection narrows during healing and the patient develops obstructive symptoms months out from surgery; typically dilated endoscopically (balloon or bougie) with repeated sessions; sometimes requires surgical revision if dilations fail.
Example
""68-year-old 9 months after low anterior resection for rectal cancer with colorectal anastomosis and diverting ostomy (now closed 4 months ago). Patient reports progressive constipation, abdominal cramping, Bristol 1 stools, distention, failed to advance to normal diet. CT abdomen: dilated colon proximal to anastomosis with transition point at low rectum, no recurrence. Colonoscopy: tight anastomotic stricture at 5 cm from anal verge, cannot pass adult colonoscope. Biopsy negative for malignancy. Diagnosis: benign anastomotic stricture. Endoscopic balloon dilation q3 weeks x3 sessions: stricture improved from 6 mm to 12 mm diameter; symptom resolution; tolerating diet.""
Clinical Context
Risk factors: (1) Anastomotic tension. (2) Inadequate blood supply to anastomotic ends. (3) Radiation (especially relevant for rectal anastamoses after radiation for low rectal cancers). (4) Staples vs hand-sewn (stapled may have higher stricture rates in some studies). (5) Postoperative leak or abscess (scarring after healing). (6) Underlying disease (Crohn's disease recurrence, malignancy recurrence). Frequency: ~5–20% of colorectal anastomoses; up to 40% of esophageal anastomoses after esophagectomy for cancer; lower rates for small bowel anastamoses. Diagnosis: contrast study (gastrografin for upper GI; barium enema for lower GI), endoscopy (allows direct visualization and biopsy), CT with oral contrast showing transition point and proximal dilation. Treatment: endoscopic (balloon dilation, bougie dilation, stent placement, EUS-guided incision); surgical (revision, resection with new anastomosis, stricturoplasty). Prevention: tension-free anastomosis with adequate blood supply, intraoperative leak testing (air or methylene blue), reinforcement of staple lines for high-risk anastomoses. Distinguish from "anastomotic leak" (acute, often within 7 days of surgery, requires urgent intervention vs stricture which is delayed and mechanical).