Biliary Tract Disease: Biliary Tract Disease: Functional Pain and Ducts

0:00Welcome to Board Pearls. This is episode four of four of the Biliary Tract Disease chapter, in the Pancreatic and Biliary Disease module. This episode is biliary pain without stones, and the bile duct's structural problems. The first patient is a woman with biliary-type pain and no stones, and her case shows what Rome four requires for functional gallbladder pain, how much a low hepatobiliary iminodiacetic acid, HIDA, ejection fraction actually means, why cholecystectomy for this pain is so often wrong, how to decide whether the sphincter of Oddi is to blame once the gallbladder is gone, and who should never have an endoscopic retrograde cholangiopancreatography, ERCP. The second patient is a woman with a dilated duct, and her case shows the cyst a patient is born with: the Todani types, why the type decides the operation, and Caroli disease. The third patient is a man with green drain fluid after cholecystectomy, and his case shows the injury a patient is given at surgery: the Strasberg types, why a stent seals most leaks, what ERCP can miss, and how strictures are treated.

1:06Here's the first patient. A thirty-four-year-old woman has had episodes of epigastric and right upper quadrant pain for a year, each lasting about an hour, bad enough to stop her working, and not relieved by a bowel movement, antacids, or changing position. Between episodes she has bloating, early fullness after meals, and alternating loose and hard stools with crampy lower abdominal pain. Two ultrasounds show no stones or sludge, and her liver tests and lipase are normal. A HIDA scan stimulated with cholecystokinin shows a gallbladder ejection fraction of twenty-two percent. Her surgeon has offered cholecystectomy.

1:43Biliary-type pain without stones, sludge, or abnormal labs raises functional gallbladder disorder, and the diagnosis has strict criteria. Rome four functional gallbladder pain is biliary-type pain in the epigastrium or right upper quadrant, lasting at least thirty minutes, severe enough to interrupt activities, and not relieved by a bowel movement, antacids, or a change in posture. It requires the absence of stones, sludge, microlithiasis, or other structural disease, with normal liver chemistries and normal lipase or amylase. Her pain fits the criteria.

2:16Her low ejection fraction is the reason she's been offered surgery, and it's weak evidence. An ejection fraction below thirty-five percent after cholecystokinin is sometimes invoked as supporting the diagnosis, but a meta-analysis of nine studies and a systematic review of twenty-three found no good evidence that it predicts relief after cholecystectomy. A smaller, more recent meta-analysis of retrospective data found a benefit, but with severe selection bias. Many patients with a normal ejection fraction also improve after surgery, which suggests either a placebo response or a real disorder that the test doesn't discriminate well. Meanwhile, biliary dyskinesia is the primary indication for up to twenty percent of cholecystectomies in United States adults and up to fifty percent in United States children, and United States rates of cholecystectomy for acalculous biliary pain are about three and a half times those of other developed countries, which suggests overtreatment.

3:11Her other symptoms may explain her pain better than her gallbladder does. Her bloating and early fullness point to functional dyspepsia, covered in chapter eight, and her crampy pain with alternating stools points to irritable bowel syndrome, covered in chapter thirteen. Both cause overlapping upper abdominal symptoms unrelated to gallbladder function. If they're the source, cholecystectomy won't relieve her pain, and it exposes her to operative risk and to post-cholecystectomy bile acid diarrhea. So her surgeon is advised to wait while her functional disorders are treated, with cholecystectomy reserved for careful selection afterward. The right upper quadrant ultrasound is itself overused in vague abdominal pain, and a normal one doesn't establish a biliary diagnosis.

3:56Removing the gallbladder doesn't settle the question, as her later course shows. She has the operation elsewhere, and eighteen months later the same pain returns, with normal liver tests and a magnetic resonance cholangiopancreatography, MRCP, showing a nine-millimeter common bile duct and nothing else. Persistent pain after a cholecystectomy driven by a low ejection fraction needs further imaging with endoscopic ultrasound, EUS, or magnetic resonance before the sphincter is blamed, because the original low ejection fraction may have marked a functional gut disorder rather than gallbladder disease. After cholecystectomy, the duct can dilate to about ten millimeters without obstruction, so her nine-millimeter duct with normal tests can be normal.

4:39The next label she's offered is sphincter of Oddi dysfunction, and Rome four has narrowed it sharply. Sphincter of Oddi dysfunction is a non-calculous obstruction at the sphincter, from fibrosis or inflammation, from spasm, or both. It's invoked in three settings: pain after cholecystectomy without a structural cause, idiopathic recurrent acute pancreatitis, and, least studied and most controversial, biliary pain with an intact gallbladder and no stones. It's also recognized after liver transplant and in cases associated with HIV or hyperlipidemia. Rome four reframed the old Milwaukee types. Former type one, biliary pain plus liver enzymes over one point one times normal plus a duct over eight to ten millimeters, is now sphincter of Oddi stenosis, a mechanical fibrotic narrowing. It's treated with empiric biliary sphincterotomy without manometry, because response is uniformly high whatever manometry shows, so manometry only adds risk.

5:42The other two former types are where most patients sit. Former type two, pain with either the lab abnormality or the dilated duct, is now suspected biliary sphincter of Oddi dysfunction, assessed individually. In small randomized trials, most patients with abnormal manometry responded to sphincterotomy, and a smaller group with normal manometry did too, so decision modeling supports empiric sphincterotomy by an experienced biliary endoscopist over a manometry-driven approach. Former type three, pain alone with normal labs and imaging, is no longer a viable diagnosis. In a large randomized, sham-controlled trial, sham endoscopy did at least as well as biliary or combined biliary and pancreatic sphincterotomy at twelve months on pain-related disability, and manometry didn't predict response, because this is functional pain that a procedure can't fix.

6:36She has pain alone with normal tests and a physiologic duct, former type three, so she shouldn't have ERCP or sphincterotomy. Her care is pain-focused therapy, attention to her functional overlap, and neuromodulators when indicated. If her enzymes had been twice normal during attacks with a twelve-millimeter duct, she'd have stenosis, treated with sphincterotomy. Raised enzymes with a normal duct would be individualized.

7:02Any sphincter procedure carries an exceptional pancreatitis risk, which shapes how it's done. Post-ERCP pancreatitis risk is very high in suspected sphincter dysfunction, and manometry alone causes it in twelve to thirty percent, because instrumenting the sphincter changes ductal pressure. So any procedure needs full prophylaxis: rectal indomethacin, one hundred milligrams, lactated Ringer's solution, and a prophylactic pancreatic duct stent in high-risk anatomy. In idiopathic recurrent acute pancreatitis without clear duct disease, manometry is avoided in favor of EUS for microlithiasis and MRCP for anatomy, and patients with an intact gallbladder and no stones aren't candidates for sphincterotomy outside trials.

7:46The second patient's problem is structural rather than functional, and it was there from birth. A thirty-one-year-old woman has had two attacks of upper abdominal pain over a year, one with a mildly raised lipase. Her ultrasound shows fusiform dilation of the common bile duct to twenty-two millimeters without stones, and her MRCP confirms a fusiform extrahepatic cyst with normal intrahepatic ducts and a fourteen-millimeter common pancreaticobiliary channel joining well above the sphincter.

8:15She has a choledochal cyst with pancreaticobiliary maljunction, and its Todani type decides the operation. Pancreaticobiliary maljunction is a long common channel, eight millimeters or longer, where the pancreatic and bile ducts join above the sphincter, letting pancreatic enzymes reflux into the bile duct, and hers is fourteen. The Todani types reflect location. Type one, fifty to eighty percent of cysts, is fusiform or saccular dilation of the extrahepatic common bile duct or common hepatic duct, often with maljunction. Type two, about two percent, is a true extrahepatic diverticulum, with low malignancy risk. Type three, the choledochocele, is intraduodenal dilation of the distal duct, presenting with pancreatitis in forty to seventy percent because it intermittently blocks the pancreatic orifice, with very low malignancy risk. Type four a is combined intrahepatic and extrahepatic cysts, and four b is multiple extrahepatic cysts. Type five is Caroli disease, with intrahepatic dilations only. Hers is type one.

9:21Her cyst has to come out because of its cancer risk. Cholangiocarcinoma risk is about ten to thirty percent in adulthood, quoted up to forty percent for type one and about seven percent for type five, with raised gallbladder and pancreatic cancer risk as well. The cyst lining is exposed for years to refluxing pancreatic enzymes and stagnant bile, which drives metaplasia, dysplasia, and carcinoma, so risk rises sharply with age and early operation is preferred, even in childhood.

9:49The operation has to remove the whole at-risk lining. Types one and four need complete cyst excision with cholecystectomy and a Roux-en-Y hepaticojejunostomy, because cancer can arise anywhere along the cyst. A Whipple operation, which removes only the distal duct, leaves at-risk proximal lining behind, so it isn't enough for type one. Type four a with diffuse intrahepatic involvement may need segmentectomy or transplant. Her gallbladder comes out too, because maljunction independently raises gallbladder cancer risk, to about thirty-five percent even without duct dilation. After the operation, the European Association for the Study of the Liver in twenty twenty-five recommends lifelong MRCP every three to five years for any retained at-risk lining. A choledochocele, by contrast, is treated endoscopically with sphincterotomy or limited excision, and a diverticulum with simple diverticulectomy.

10:44Type five behaves differently, because it lies entirely inside the liver. Caroli disease is congenital intrahepatic biliary ectasia, and it presents with recurrent cholangitis and intrahepatic stones, because the dilated ducts cause bile stasis and repeated bacterial seeding. Caroli syndrome adds congenital hepatic fibrosis with portal hypertension, from a ductal plate malformation affecting both small and large ducts. Both are associated with autosomal recessive polycystic kidney disease and renal tubular ectasia, because they belong to the same fibropolycystic spectrum, and cholangiocarcinoma develops in about seven percent over decades. Segmental resection treats disease confined to one lobe, often the left, and transplant treats diffuse disease or advanced portal hypertension. Antibiotics treat each episode of cholangitis without changing the anatomy, and ursodeoxycholic acid is sometimes added to reduce stone burden.

11:39The third patient's duct problem was caused at surgery. A forty-five-year-old man had a laparoscopic cholecystectomy five days ago, and since yesterday he's had worsening abdominal pain, fever, green fluid in his drain, a white count of fourteen thousand, and mildly raised liver enzymes.

11:56Pain, fever, and bile in the drain five days after cholecystectomy mean a bile leak. Bile leaks typically present within ten days of cholecystectomy with pain or bile peritonitis, fever, leukocytosis, and raised enzymes, and persistent bilious drain output or biliary ascites on imaging confirms the diagnosis. Biliary injury occurs in about zero point three to zero point five percent of laparoscopic cholecystectomies, mainly from clipping or thermal injury during dissection of Calot's triangle. Anatomic variants raise the risk about eight-fold, especially variants of the cystic duct and a right posterior sectoral duct that inserts into the cystic duct or low into the common hepatic duct and is mistaken for the cystic duct.

12:42His injury is classified by the Strasberg system, which sets the treatment. Type A is a leak from the cystic duct stump, from a displaced clip, or from a duct of Luschka, a small accessory duct draining from the liver into the gallbladder fossa, and it's the most common and lowest-pressure leak. Type B is occlusion of an aberrant right hepatic duct. Type C is a leak from a cut aberrant right hepatic duct. Type D is a lateral injury to the main duct. Type E is complete transection or stricture, with Bismuth subclasses one to five by level: one is distal, two mid, three preserves the confluence, four involves the confluence, and five is an isolated right posterior sectoral duct. HIDA or MRCP confirms a leak, and ERCP both diagnoses and treats type A injuries and many type C and D injuries that keep continuity. His ERCP shows a leak from the cystic duct stump with an intact main duct, a type A leak.

13:40His leak is treated with a stent, because the problem is pressure. Bile normally flows down the pressure gradient from the duct into the duodenum, but the sphincter's resistance favors any side channel. Sphincterotomy or a plastic stent across the papilla lowers that resistance, by cutting the sphincter or bypassing it, so bile flows into the duodenum instead of out of the leak, and the leak seals in ninety percent or more of type A injuries. A stent alone is more effective, with fewer complications, than sphincterotomy alone, and sphincterotomy is added when a retained stone is raising the pressure. His stent is placed, and his drain output falls until the leak seals.

14:19ERCP can also be misleading, in two specific ways. If contrast had failed to pass above the common hepatic duct, that wouldn't be a failed cannulation but complete transection, type E, which needs a Roux-en-Y hepaticojejunostomy because there's no continuity for a stent to bridge. And a normal-looking ERCP with persistent bilious drainage can miss an isolated right posterior duct injury, because faint filling of the injured segment looks like normal opacification. MRCP comes next in that case, because it images bile-filled ducts without depending on contrast injected from below.

14:56His injury could also leave a stricture, which is usually treated endoscopically first. Months after a duct injury, cholestasis can come from a postoperative stricture. Serial sessions of balloon dilation with multiple side-by-side plastic stents over twelve months, or fully covered metal stents in some centers, remodel most strictures into lasting patency. Hepaticojejunostomy is reserved for refractory strictures and transection, and the level of the stricture predicts the surgical complexity. When a stricture is indeterminate, brushings, intraductal forceps biopsy, fluorescence in situ hybridization, and cholangioscopy are used in sequence to exclude an unsuspected cancer.

15:38Here are the traps the boards set in functional pain. A low ejection fraction alone isn't a reason for cholecystectomy. Functional dyspepsia and irritable bowel syndrome are excluded first. A normal ultrasound isn't a biliary diagnosis. A duct of up to ten millimeters after cholecystectomy can be normal. Pain with normal labs and imaging isn't an indication for ERCP. Sphincter stenosis is treated with sphincterotomy without manometry. Any sphincter procedure needs full pancreatitis prophylaxis. And in recurrent pancreatitis, EUS and MRCP come before any manometry.

16:13For cysts and duct injuries, the traps are these. A type one cyst needs complete excision with hepaticojejunostomy, not a Whipple, and the gallbladder comes out with maljunction. A type one cyst in a young adult isn't watched. A choledochocele is treated with sphincterotomy rather than excision. Surveillance continues after excision. Caroli disease comes with a kidney association. A type A leak is treated with a stent, not sphincterotomy alone. Complete transection isn't a failed cannulation. A normal ERCP doesn't end the workup when bile keeps leaking. And a benign stricture gets serial dilation and stenting before surgery.

16:54So, start to finish. Functional gallbladder pain needs Rome four biliary-type pain without stones or structural disease, with normal labs. Don't operate on a low ejection fraction alone, and treat functional dyspepsia and irritable bowel syndrome first. After cholecystectomy, reimage before blaming the sphincter, and remember that a duct up to ten millimeters can be normal. Pain with raised enzymes and a dilated duct is stenosis, treated by sphincterotomy without manometry, one abnormality is individualized, and pain alone gets no ERCP. Any sphincter procedure needs full prophylaxis.

17:30Classify biliary cysts by Todani type: types one and four need complete excision with cholecystectomy and hepaticojejunostomy, not a Whipple, followed by MRCP every three to five years; type two gets diverticulectomy; type three gets sphincterotomy; and Caroli disease gets segmental resection or transplant. Classify bile duct injury by Strasberg type: type A leaks seal with a stent across the papilla, type E transection needs hepaticojejunostomy, a persistent leak after a normal ERCP needs MRCP, and benign strictures get serial dilation and multiple plastic stents over a year.

18:08That completes chapter twenty-seven. Chapter twenty-eight begins the Endoscopic Procedures module, with Endoscopy Practice and Sedation.

18:17For the full chapter, the practice vignettes, and the topic-tagged question bank, head to board pearls dot com. You'll find the rest of the series on Apple Podcasts, Spotify, or wherever you listen to podcasts. That brings us to the end of episode four of four of chapter twenty-seven, and I'll see you in the next one.