Cystic Duct Remnant Syndrome

Cystic duct remnant syndrome is biliary type pain, with or without stones or inflammation, attributed to a long remnant of cystic duct left after cholecystectomy. A remnant over 1 cm is generally considered long.

It is an uncommon, probably under recognised cause of postcholecystectomy pain. It follows both open and laparoscopic surgery, and the presence of stones or inflammation in the remnant is more likely when the remnant is long and the original gallbladder contained stones.

Pathophysiology.

Stones may form or remain in the remnant, and chronic inflammation or a stump neuroma produces pain. A dilated, bile filled remnant causes biliary type pain.

Right upper quadrant or epigastric biliary type pain months to years after cholecystectomy, sometimes with nausea, jaundice, cholangitis or pancreatitis if a stone passes into the bile duct.

Red flags.

• Fever and jaundice.
• Recurrent pancreatitis.
• Weight loss.

Liver tests and lipase (often normal between attacks). Ultrasound may show a dilated remnant. Magnetic resonance cholangiopancreatography or endoscopic ultrasound shows a long remnant with stones or dilatation. Endoscopic retrograde cholangiopancreatography with cholangiography shows the remnant but does not reliably clear it. Exclude other causes of postcholecystectomy pain.

Differential diagnosis.

• Retained or recurrent common bile duct stone.
• Papillary stenosis.
• Bile duct stricture.
• Peptic ulcer or reflux disease.
• Functional abdominal pain.

Surgical remnant excision (completion remnantectomy), laparoscopic where possible, with intraoperative cholangiography, is the definitive treatment for symptomatic patients with a remnant containing stones or inflammation. Selection of patients without objective abnormality needs caution, because pain often persists.

• Cefazolin (surgical prophylaxis): 2 g IV (3 g if over 120 kg) within 60 minutes before incision; single dose, repeated after 4 hours if surgery continues; maximum 6 g in 24 hours for prophylaxis; monitor for hypersensitivity; adjust the interval when creatinine clearance is under 35 mL/min.

Treat a stone that has migrated into the common bile duct endoscopically (sphincterotomy and extraction). Treat cholangitis with antibiotics (piperacillin-tazobactam 4.5 g IV every 6 hours for 4 to 7 days after drainage; maximum 18 g daily; monitor renal function and counts; reduce for creatinine clearance under 40 mL/min).

Monitoring. Symptoms and liver tests at 6 weeks and 6 months after surgery.

Referral and escalation. Hepatobiliary surgery with experience of re-operative biliary surgery.