Why is Balloon Dilation Preferred Over Stents for PSC?

If you recently had an ERCP (Endoscopic Retrograde Cholangiopancreatography) for a blockage in your bile duct, you might have woken up expecting the doctor to have placed a stent. Because stents are so common in other medical procedures—like opening blocked heart arteries—many people are surprised to learn their doctor simply stretched the bile duct with a balloon and left nothing behind.

For patients with Primary Sclerosing Cholangitis (PSC), using a balloon to stretch a narrowed duct (called balloon dilation) is actually the safest and most recommended first-line treatment ^[1][2][3]. While stents can be useful in certain situations, leaving a plastic tube in a PSC-affected bile duct dramatically increases the risk of severe infections and complications ^[1][2][3].

Why Balloon Dilation is the First Choice

During an ERCP for PSC, doctors are usually looking for a dominant stricture—a severely narrowed section of the bile duct that is blocking the flow of bile. To open this stricture, the doctor inflates a small, specialized balloon inside the narrowing to gently stretch the duct back open. During this process, doctors also frequently take brushings or biopsies of the stricture to check for abnormal cells, which is a standard and critical part of evaluating any narrowing in PSC ^[4][5].

Medical guidelines strongly recommend this balloon dilation as the initial treatment of choice ^[3][6]. Research consistently shows that stretching the duct with a balloon works just as well as placing a stent to relieve symptoms (like jaundice and itching) and improve bile flow ^[1][2][3]. In fact, some long-term studies suggest that having scheduled balloon dilations over time may even help protect liver function and delay the need for a liver transplant ^[7][8][9].

The Hidden Risks of Stents in PSC

It is completely understandable to think that leaving a stent behind would keep the duct propped open better than just stretching it. However, bile duct stents for PSC are typically made of plastic. Metal stents, like those used in the heart, are generally avoided in benign (non-cancerous) strictures because they can become permanently embedded in the bile duct tissue.

Because plastic stents are used instead, routine stenting is actively discouraged for several reasons:

• High Risk of Bacterial Cholangitis (Infection): Plastic stents are foreign objects. Over time, bacteria can build up on the plastic, and the slow-moving bile in a PSC patient can turn to sludge and clog the stent. This blockage frequently leads to bacterial cholangitis, a serious and potentially life-threatening infection of the bile ducts ^[10][1][11].
• Increased Risk of Pancreatitis: Leaving a stent in place is associated with significantly higher rates of post-ERCP pancreatitis (painful inflammation of the pancreas) compared to balloon dilation alone ^[1][2][3].
• Equivalent Long-Term Results: Studies comparing patients who got a balloon alone versus a balloon plus a stent show no difference in long-term success or survival rates ^[2][12]. Because the stent doesn’t offer a better outcome but does add significant risk, doctors prefer to avoid it.

When Are Stents Used in PSC?

There are still times when your doctor might choose to use a stent. Stenting is usually reserved as a backup plan if a stricture is very stubborn (refractory) and immediately collapses after being stretched by a balloon ^[10][13]. If a stent is placed, it is generally considered a temporary measure. Your doctor will require you to have another ERCP shortly after—usually within a few days to a couple of weeks—to remove or replace the stent before it gets clogged.

What This Means for Your Care

Knowing that balloon dilation is the standard of care can give you peace of mind that your doctor is using the safest approach for your PSC. Because PSC causes progressive scarring, that same stricture may narrow again in the future ^[14][15]. It is very common for patients to need repeat ERCPs with balloon dilation to keep their bile ducts open and flowing over the years. The timeline for these repeat procedures varies wildly from patient to patient—some may need one every few months, while others go years without needing an intervention.

When to Call Your Doctor

While balloon dilation is the safest option, any ERCP carries baseline risks, including pancreatitis, bleeding, or infection ^[3]. It is important to monitor your body in the days following the procedure. Call your doctor or seek immediate medical care if you experience any of the following warning signs:

• A new fever or chills (which can indicate an infection or cholangitis)
• Sudden, severe abdominal pain (especially in the upper right side or radiating to your back)
• Returning or worsening jaundice (yellowing of your eyes or skin)
• Persistent vomiting or an inability to keep fluids down