Pancreatic Stent: Purpose, Placement, and What to Expect

A pancreatic stent is a small tube placed inside the pancreatic duct to keep it open, relieve pressure, or prevent inflammation after certain endoscopic procedures. These stents serve two broad roles: they act as a short-term safeguard against a painful complication called post-ERCP pancreatitis, and they provide longer-term relief for people whose pancreatic duct has narrowed from chronic disease or injury. The devices are typically placed during an endoscopic procedure rather than open surgery, and while the concept sounds straightforward, the details around timing, stent type, removal, and risks are worth understanding if you or someone you know is facing the procedure.

Why a Pancreatic Stent Might Be Needed

The most common reason for placing a pancreatic stent is to prevent pancreatitis triggered by ERCP, a procedure where a flexible scope is guided through your mouth and stomach into the small intestine to access the bile and pancreatic ducts. ERCP is used to remove gallstones lodged in the bile duct, evaluate unexplained blockages, or take tissue samples. The catch is that the scope can inadvertently irritate the pancreatic duct opening during the procedure, and that irritation sometimes causes the pancreas to become acutely inflamed afterward. This complication, known as post-ERCP pancreatitis, can range from a few days of abdominal pain to a serious hospitalization.

A prophylactic pancreatic stent placed during the ERCP helps keep the duct open so that pancreatic juice flows freely instead of building up pressure. A multicenter randomized trial found that placing a stent after inadvertent pancreatic duct contact cut the rate of post-ERCP pancreatitis roughly in half, from about 25% to about 13%.¹ A meta-analysis pooling data from over 2,500 patients confirmed the protective effect across studies.²

You might wonder whether anti-inflammatory medication alone could do the job without the hassle of a stent. Rectal indomethacin is routinely given before ERCP to reduce pancreatitis risk, and a large trial tested whether the drug by itself was good enough for high-risk patients. The answer was no: about 15% of patients given indomethacin alone still developed pancreatitis, compared with roughly 11% of those who received both the drug and a stent. The researchers concluded that for high-risk patients, the combination remains the standard of care.³

Stenting for Chronic Pancreatitis and Other Conditions

Beyond short-term prevention, pancreatic stents play a longer therapeutic role for people with chronic pancreatitis. Over time, repeated bouts of pancreatic inflammation can scar and narrow the main pancreatic duct. That narrowing traps digestive enzymes inside the gland, causing persistent or recurring abdominal pain. A stent inserted across the stricture decompresses the duct and gradually widens it, providing pain relief.⁴ Guidelines from the American and European endoscopy societies recommend placing a plastic stent across the most significant stricture, and studies report that this approach provides immediate pain relief in the vast majority of patients, with long-term success around 84%.⁵

These stents do not cure chronic pancreatitis. The underlying scarring remains, and effective treatment of a stricture typically requires around three stent exchanges at roughly 12-week intervals.⁵ Each exchange means another endoscopic procedure. Think of it less as a one-and-done fix and more as a series of sessions aimed at gradually remodeling the duct.

Pancreatic stents are also used in less common situations. After pancreatic surgery, a fistula (an abnormal leak of pancreatic fluid) can sometimes develop. Placing a stent lowers duct pressure and redirects flow away from the leak, letting the fistula heal without a second operation.⁶ Stents can similarly drain fluid collections like pseudocysts, bridge duct disruptions from abdominal trauma, and manage complications of acute pancreatitis.⁷ Even children with traumatic pancreatic injuries have been successfully treated with endoscopic stenting to avoid surgery.⁸

How the Stent Is Placed

Almost all pancreatic stents are placed during ERCP. You receive sedation or general anesthesia, and the gastroenterologist passes a thin, flexible endoscope down through your throat into the duodenum, the first section of the small intestine. There, the scope is maneuvered to the papilla, a small mound of tissue where the bile duct and pancreatic duct empty into the intestine. The doctor threads a thin wire into the pancreatic duct under X-ray guidance, then slides the stent over the wire into position. The entire procedure often takes less than an hour, and you typically go home the same day once the sedation wears off.

For prophylactic stents placed during a first-time ERCP, the stent is usually small, often 3 to 5 French in diameter (roughly 1 to 1.7 millimeters) and just a few centimeters long. Therapeutic stents for chronic pancreatitis strictures tend to be larger, with guidelines recommending a 10 French diameter to resist clogging.⁵ Smaller stents block up faster, leading to more pain-related hospital visits.

In cases where conventional ERCP cannot reach the pancreatic duct, such as when anatomy has been altered by previous surgery or a tight stricture blocks the scope’s path, an alternative called EUS-guided access can be used. This involves puncturing through the stomach wall under ultrasound guidance to reach the duct directly. The approach has reported technical success rates ranging from about 63% to 100%, but it is more complex and carries a higher complication rate, roughly 27% across published case series.⁹ For that reason, it is generally reserved for patients who have failed standard ERCP.

Plastic vs. Metal Stents

The workhorse of pancreatic stenting is the plastic stent, typically made of polyethylene. Plastic stents are inexpensive, widely available, and easy to exchange during follow-up procedures. Their main drawback is that they clog over time and need to be swapped out regularly.

Fully covered self-expanding metal stents are the alternative. These are wider and remain open longer, which means fewer exchange procedures. In a study comparing the two in chronic pancreatitis, metal stents resolved duct strictures at a much higher rate than plastic ones (about 87% versus 42%), and more patients in the metal stent group reported lasting pain relief (roughly 77% versus 54%).¹⁰ The trade-off is that metal stents migrate out of position more often (about 27% versus 4% for plastic) and can cause new strictures in the duct at a higher rate.¹⁰ Stent fracture was also seen with the metal design. So while metal stents work better at opening the duct and reducing pain, they introduce their own set of complications. Plastic stents remain the default recommendation in major society guidelines, with metal stents used selectively.

In the bile duct (not the pancreatic duct, but a closely related setting), a randomized trial in patients with pancreatic cancer undergoing chemotherapy found that metal stents blocked significantly less often than plastic ones during treatment, requiring far fewer re-interventions.¹¹ This gives a sense of the durability difference between the two materials, though the choice in the pancreatic duct specifically depends on the clinical scenario.

How Stents Come Out

The removal plan depends entirely on why the stent was placed. Prophylactic stents, the small ones placed during ERCP to prevent pancreatitis, are designed to fall out on their own. The stent loosens and passes through the intestine, eventually leaving the body in stool without you noticing. Studies show that the vast majority of these stents, around 80% to 92%, migrate spontaneously. About half pass within two weeks, roughly 85% within four weeks, and nearly all by three months.¹²¹³

Internal flanges, small wings on the stent meant to hold it in place, can actually prevent spontaneous passage. Stents without flanges or with only external flanges tend to pass more reliably. When a stent does not pass on its own, it needs to be removed endoscopically. European guidelines recommend checking whether a prophylactic stent has passed within 5 to 10 days and scheduling endoscopic retrieval if it has not, though actual practice varies widely. A survey of endoscopists found that about 63% perform endoscopic retrieval, and over half had no fixed follow-up schedule.¹⁴ That inconsistency suggests that the field is still working out the most efficient follow-up pathway.

For therapeutic stents placed to treat chronic pancreatitis strictures, the timeline is completely different. These stents are intentionally left in place for about three months before being exchanged for a new one, and the cycle repeats multiple times. Removal is always done endoscopically during a planned follow-up ERCP.

Complications and What Can Go Wrong

Pancreatic stents generally perform well, but they carry a real set of risks worth knowing about.

• Occlusion: Plastic stents clog. The process is driven mainly by a protein-based film that forms on the stent surface, with bacterial colonization accumulating later, especially at the end that sits in the intestine.¹⁵ Bacteria were detected in nearly 96% of removed stents in one study, with a wide variety of species present.¹⁶ Patients over 50 had significantly more protein buildup, which accelerates clogging. Once blocked, the stent stops doing its job and needs to be replaced.
• Migration: The stent can shift from its intended position. It may slip outward into the intestine (which is essentially harmless and in fact desirable for prophylactic stents) or inward, deeper into the pancreatic duct. Inward migration is uncommon, occurring in about 0.2% of placements in one large 25-year review. When it does happen, endoscopic retrieval succeeds about 81% of the time, though roughly one in five retrieval attempts is complicated by post-procedure pancreatitis.¹⁷ In a separate series, migration, dislocation, and fracture each occurred in roughly 1% to 1.5% of cases, and all migrated stents were successfully retrieved.¹⁸
• Ductal changes: This is the subtler risk. Stents physically press against the duct lining, and that contact can cause new morphologic changes even in previously normal ducts. In one study, about 80% of patients had new duct changes visible on imaging immediately after stent removal, including irregularities, narrowing, and changes to side branches.¹⁹ Histologic examination has shown that these imaging changes correspond to actual tissue inflammation and scarring in the pancreas, which may in some cases be severe and irreversible.²⁰ This is one reason stents are not left in place indefinitely; the device that treats the problem can, over time, create new problems of its own.

Other documented complications include bleeding, duct perforation, infection, and rarely, intestinal obstruction from a displaced stent.²¹ The overall risk profile is considered acceptable for the problems stents solve, but none of these complications is trivial, and they underscore why follow-up matters.

What Recovery Feels Like

After an ERCP with stent placement, most people spend a few hours in recovery while sedation wears off. You may have a sore throat from the scope. Mild bloating and abdominal discomfort are common in the first day or two. If the stent was placed prophylactically, the recovery is really about the ERCP itself rather than the stent. You likely will not feel the stent at all, and it will pass on its own within weeks.

For patients with chronic pancreatitis who receive a therapeutic stent, the experience is different because the underlying disease is the bigger factor. A study tracking outcomes in this group found that patients reported their average pain score dropping from about 8.7 out of 10 before treatment to about 4.1 afterward. Nearly half reported using less pain medication, roughly two-thirds said their relapses were less severe or stopped entirely, and about a fifth gained more than 15 pounds after treatment, likely reflecting improved ability to eat.²² About 83% of patients considered their treatment successful.

That said, stenting does not erase chronic pancreatitis. A multicenter quality-of-life study found that patients who had pancreatic duct stenting still used opioids at roughly double the rate of a reference population, even though their pain patterns were similar to those who had not been stented.²³ The picture that emerges is one of meaningful improvement rather than cure: less pain, fewer crises, better nutrition, but often continued medication use and ongoing management.

Biodegradable Stents on the Horizon

One of the frustrations of pancreatic stenting is the need for repeat procedures to remove or exchange devices. Biodegradable stents aim to eliminate that step entirely by dissolving inside the body on a predictable schedule. In preclinical testing, a biodegradable pancreatic stent remained in place at one month but had completely disappeared by three months in all animals studied.²⁴ More recently, a pilot study tested helicoidal (spiral-shaped) biodegradable stents designed for endoscopic placement in humans, with three different degradation speeds: a fast version dissolving in about 12 days, a medium version in about 20 days, and a slow version in about 11 weeks.²⁵ Having the option to match the degradation rate to the clinical need, whether that is a few days of prophylactic support or weeks of stricture therapy, is an appealing concept. These devices are still investigational, but they represent a plausible path toward fewer repeat endoscopies for patients who already have enough to deal with.

Pancreatic Stenting in Children

Pancreatic stents are not exclusively an adult procedure. Children can develop pancreatic duct problems from abdominal trauma, congenital anomalies, or the same kinds of biliary conditions that affect adults. A case report described successful endoscopic stenting of a traumatic pancreatic duct injury in a 9-year-old boy, avoiding what would otherwise have been a major operation.⁸ The complication rates of pediatric ERCP, including stent placement, have been found to closely parallel those seen in adults, which is reassuring given that the smaller anatomy might intuitively seem riskier.²⁶ Pediatric pancreatic stenting remains uncommon and is typically performed at specialized centers, but the evidence so far suggests it is a viable option when the anatomy allows it.