CT abdomen and pelvis with IV contrast — same as adults
Attempt to minimize radiation — ultrasound first, then low-dose CT protocol
Radiation dose optimization with pediatric CT protocols
Surgical management
Enterolithotomy — same principles as adults
Weight-based fluid resuscitation
Pediatric surgery consultation mandatory
Antibiotic dosing
Piperacillin-tazobactam 100 mg/kg IV every 8 hours (piperacillin component), maximum 4 g per dose
Ceftriaxone 50–100 mg/kg IV daily, maximum 2 g per dose
Metronidazole 7.5 mg/kg IV every 8 hours, maximum 500 mg per dose
Background
Epidemiology
Incidence and prevalence
Gallstone ileus accounts for 1–4% of all mechanical bowel obstructions
Accounts for up to 25% of non-strangulated small bowel obstructions in patients over 65
Rare overall — estimated 0.3–0.5 cases per 100,000 population per year
Demographics
Predominantly elderly — median age at presentation 74–78 years
Female predominance — female-to-male ratio 3.5–4.5:1
High comorbidity burden — cardiovascular disease, diabetes, CKD in most patients
Mortality
In-hospital mortality 6.7–18%
Largely driven by elderly, comorbid patient population
Higher mortality with bowel resection vs enterolithotomy alone
Stone impaction sites
Terminal ileum most common (60–73%) — narrowest lumen in small bowel
Jejunum (14%)
Duodenum (5%) — Bouveret syndrome
Colon (8%)
Pathophysiology
Fistula formation mechanism
Chronic cholelithiasis creates repeated episodes of cholecystitis
Inflammatory adhesion between gallbladder and adjacent bowel
Pressure necrosis and fistula formation over weeks to months
Cholecystoduodenal fistula most common type (68%)
Cholecystocolonic (10–15%), cholecystogastric (5%), and others less common
Stone migration
Large stones (> 2–2.5 cm) migrate through fistula into bowel lumen
Mean impacted stone size is 3.6 cm
Stone migrates distally until it reaches a narrowing it cannot pass
Bowel obstruction mechanism
Mechanical obstruction at impaction site
Intraluminal filling defect blocking bowel lumen
Proximal bowel dilation with air-fluid levels
"Tumbling obstruction" — stone may dislodge and re-impact more distally
Bowel wall injury at impaction site
Pressure necrosis of bowel wall mucosa
Risk of perforation if not relieved promptly
Bowel ischemia from mesenteric vascular compromise at obstruction site
Post-cholecystectomy mechanism
Lost stones from laparoscopic cholecystectomy
Stone falls into peritoneal cavity
Creates inflammatory reaction and fistula with adjacent bowel
Latency from surgery up to 50 years reported
Therapeutic Considerations
Surgical strategy rationale
Enterolithotomy alone is supported by evidence as lowest-risk definitive intervention
Multivariate analysis shows OR 2.86 for one-stage vs enterolithotomy alone mortality
The fistula and residual gallbladder can be addressed electively in survivors
Recurrence rate after enterolithotomy alone is < 5%
Cholecystectomy and fistula repair — selective approach
Only 10% of patients require reoperation for biliary symptoms after enterolithotomy alone
One-stage procedure appropriate only in physiologically fit patients
Interval cholecystectomy at 4–6 weeks in selected patients with persistent biliary symptoms
Mandatory intraoperative full bowel assessment
16% of cases have more than one ectopic stone — missed stones cause early recurrence
Palpate entire small bowel from Treitz to ileocecal valve
Antibiotic stewardship
Pre-operative prophylaxis reduces surgical site infection
Cefazolin 2 g IV single dose within 60 minutes of incision (preferred)
Vancomycin 15 mg/kg IV over 60 minutes for beta-lactam allergy
Redose cefazolin if procedure > 4 hours or blood loss > 1500 ml
Treatment vs prophylaxis distinction
Active sepsis or peritonitis — therapeutic antibiotics for 5–7 days
No peritonitis — prophylaxis only, discontinue within 24 hours of surgery
Prevention of recurrence
Cholecystectomy and fistula repair eliminate source of further stone migration
Risk of persistent cholecystoenteric fistula — cholangitis, gallbladder carcinoma
Long-term risk of cholangiocarcinoma with persistent bilioenteric communication
Ursodeoxycholic acid has no established role in preventing recurrence after gallstone ileus
No randomized data supporting use in this context
Evidence levels
Enterolithotomy alone as preferred approach — Class IIa recommendation based on observational data
Laparoscopic-assisted enterolithotomy — feasible with comparable outcomes (Class IIb evidence)
CT as gold standard imaging — ACEP Level B recommendation equivalent for bowel obstruction workup
Patient Discharge Instructions
copy discharge instructions
Discharge instructions after gallstone ileus surgery
Wound care
Keep incision clean and dry for 48 hours after surgery
Pat dry after showering — no soaking or tub baths until fully healed
Cover with clean dry dressing if draining
Activity restrictions
No heavy lifting (> 5 kg) for 6 weeks after open surgery
No driving while taking narcotic pain medication
Gradually increase walking daily — short walks, increase distance each day
Diet after surgery
Start with clear liquids (water, broth, juice, popsicles)
Advance to soft low-fat foods as tolerated over 2–3 days
Small, frequent meals — 5–6 small meals per day
Avoid high-fat foods, fried foods, and large meals for at least 4 weeks
Medications
Take prescribed pain medications as directed — do not exceed stated doses
Continue any prescribed antibiotics until the full course is finished
Resume your regular home medications as instructed by your surgeon
Warning signs to return to ER immediately
Fever over 38.5 C or shaking chills
May indicate wound infection, abscess, or cholangitis
Do not wait until your follow-up appointment
Abdominal pain that is getting worse or not controlled with medications
Different from expected surgical soreness
Especially if associated with distension or inability to pass gas
Vomiting that prevents you from keeping fluids down
Risk of dehydration and recurrent bowel obstruction
May indicate another gallstone has caused a new obstruction
No bowel movement for more than 3 days after going home
Constipation common after abdominal surgery and narcotic use
May need evaluation for ileus or recurrent obstruction
Yellow skin or eyes (jaundice)
May indicate cholangitis from persistent biliary fistula
Requires urgent biliary evaluation
Redness, swelling, warmth, or discharge from incision
Signs of surgical site infection
Requires prompt wound assessment
Inability to urinate or very little urine output
Dehydration or kidney complication
Drink fluids and seek assessment if no urine in 8 hours
Follow-up plan
Surgeon appointment within 1–2 weeks after discharge
Wound check and staple or suture removal
Discussion of whether gallbladder removal is recommended
If the gallbladder was not removed during surgery
There is a small risk (< 5%) of recurrent bowel obstruction from another gallstone
There is a risk of gallbladder infection (cholangitis) from the existing connection
Elective gallbladder removal may be recommended at 4–6 weeks — discuss with surgeon
Contact information for your surgical team
Call the office for any questions or concerns after discharge
References
Guidelines and key sources
Key references
Halabi WJ, Kang CY, Ketana N, et al. Surgery for Gallstone Ileus: A Nationwide Comparison of Trends and Outcomes. Annals of Surgery. 2014. PMID 23295322
Large series — nationwide outcomes data for surgical approach comparison
Mortality data and risk factor analysis for enterolithotomy vs one-stage
Ayantunde AA, Agrawal A. Gallstone Ileus: Diagnosis and Management. World Journal of Surgery. 2007. PMID 17436117
Comprehensive review of impaction sites, fistula types, and surgical strategy
Multiple stone detection in 16% of cases
Abou-Saif A, Al-Kawas FH. Complications of Gallstone Disease. American Journal of Gastroenterology. 2002. PMID 11866258
Imaging sensitivity and specificity data — CT vs ultrasound vs plain film
Rigler triad performance characteristics
Reisner RM, Cohen JR. Gallstone Ileus: A Review of 1001 Reported Cases. The American Surgeon. 1994. PMID 8198337
Landmark 1001-case review — foundational epidemiology and outcomes
Alemi F, Seiser N, Ayloo S. Gallstone Disease: Cholecystitis, Mirizzi Syndrome, Bouveret Syndrome, Gallstone Ileus. Surgical Clinics of North America. 2019. PMID 30846032
Current comprehensive review including Bouveret syndrome and laparoscopic approach
Inukai K. Gallstone Ileus: A Review. BMJ Open Gastroenterology. 2019. PMID 31875141
Modern systematic review of clinical features, imaging, and surgical management
Moberg AC, Montgomery A. Laparoscopically Assisted or Open Enterolithotomy for Gallstone Ileus. British Journal of Surgery. 2007. PMID 17058318
Evidence supporting laparoscopic-assisted approach with comparable outcomes
Distinct code from other forms of bowel obstruction
Use for billing and documentation
ICD-10 K31.5 — obstruction of duodenum — for Bouveret syndrome
Gallstone impacted in duodenum causing gastric outlet obstruction
ICD-10 K82.3 — fistula of gallbladder
For cholecystoenteric fistula as associated diagnosis
Rigler triad — pathognomonic diagnostic triad
Pneumobilia plus bowel obstruction plus ectopic gallstone
Sensitivity on CT approximately 78%, specificity approaching 100%
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