MRCP (MR Cholangiopancreatography) — Dictation, Appropriateness, and Dose for Residents

1. The MRCP Read: When Ultrasound Isn’t Enough

It’s a classic consult. The ED calls about a patient with right upper quadrant pain and jaundice. The ultrasound shows a dilated common bile duct, but no definite stone. Now GI is on the line, asking if this is a stone they can grab with ERCP or a stricture that needs a different workup. The attending wants a definitive answer on the level of obstruction and any underlying cause. This is where Magnetic Resonance Cholangiopancreatography (MRCP) shines, giving you a non-invasive, radiation-free look at the entire biliary tree and pancreatic duct.

As a resident, your job is to systematically evaluate the ducts, measure them accurately, and call out any filling defects or strictures. It’s a study that directly guides the next, often invasive, step in patient care. Getting it right matters. For more high-yield guides and tools, check out the residents and fellows resource hub we’ve put together.

2. What an MRCP (Magnetic Resonance Cholangiopancreatography) Covers and What Attendings Look For

An MRCP is essentially a non-contrast MRI that uses heavily T2-weighted sequences to make fluid-filled structures—like the biliary tree, pancreatic duct, and gallbladder—appear extremely bright. It’s a virtual cholangiogram without the scope or the radiation. It’s the go-to problem-solver when ultrasound is equivocal for choledocholithiasis or when you need to map out complex biliary anatomy.

Your attending is looking for a clear, concise report that answers the specific clinical question. They expect you to comment on:

• Biliary Ducts: Are the intrahepatic or extrahepatic ducts dilated? Measure the common bile duct (CBD). A diameter over 6 mm (or 10 mm in elderly or post-cholecystectomy patients) is suspicious for obstruction.
• Level of Obstruction: If there’s dilation, where is the transition point? Is it at the ampulla, in the mid-CBD, or at the confluence? This is critical for surgical or endoscopic planning.
• Etiology: Is there a filling defect (stone)? A stricture (benign vs. malignant features)? A classic “beaded” appearance suggesting primary sclerosing cholangitis (PSC)?
• Pancreatic Duct: Evaluate the main pancreatic duct for dilation, strictures, or communication with cystic lesions (like an Intraductal Papillary Mucinous Neoplasm, or IPMN). Note any anatomic variants like pancreas divisum.
• Gallbladder and Pancreas: Assess for gallstones, sludge, wall thickening, and evaluate the pancreatic parenchyma for masses or signs of pancreatitis.

3. Radiology Report Template for MRCP (Magnetic Resonance Cholangiopancreatography)

This is a solid starting point for your MRCP dictation. You can adapt it into a macro in your speech recognition software. The key is to be systematic and answer the clinical question.

Technique

Multiplanar, multisequence MRI of the abdomen was performed without intravenous contrast, including heavily T2-weighted sequences for cholangiopancreatography. Sequences include coronal SSFSE, axial T2-weighted images with and without fat saturation, and 3D high-resolution and thick-slab MRCP acquisitions.

Findings

Biliary Tree: The intrahepatic biliary ducts are [not dilated / mildly dilated / moderately dilated]. The common hepatic duct measures [number] mm. The common bile duct measures [number] mm in maximal diameter. [Describe any filling defects, strictures, or transition points. Example: There is a [number] mm filling defect in the distal common bile duct consistent with a stone. There is an abrupt transition point at the level of the pancreatic head.]

Gallbladder: The gallbladder is [distended / surgically absent / contracted]. [Describe gallstones, sludge, wall thickening, or pericholecystic fluid.]

Pancreas: The pancreatic head, body, and tail are [unremarkable / demonstrate findings of pancreatitis / contain a mass or cyst]. The main pancreatic duct is [not dilated, measuring X mm / dilated, measuring Y mm]. [Describe any side-branch ductal ectasia or communication with cystic lesions.]

Liver: The liver is [normal in size and signal / demonstrates cirrhosis / contains focal lesions]. No suspicious hepatic mass.

Spleen, Adrenals, Kidneys: Unremarkable.

Other: [Note any ascites, lymphadenopathy, or other incidental findings.]

Impression

1. [Mild / Moderate / Severe] intrahepatic and extrahepatic biliary ductal dilation, with a common bile duct diameter of [number] mm.

2. [Finding causing the obstruction. Example: A [number] mm stone in the distal common bile duct, consistent with choledocholithiasis, is the likely cause of biliary obstruction.] OR [Example: A short-segment stricture in the mid common bile duct, suspicious for cholangiocarcinoma.]

3. [Other significant findings. Example: Cholelithiasis without evidence of acute cholecystitis.] OR [Example: Unremarkable main pancreatic duct.]

4. Free Template Sources for Other Modalities

Building a personal library of high-quality templates is one of the best things you can do as a trainee. While you can build your own, two great free repositories exist that are worth bookmarking. They are curated by radiologists and cover a huge range of studies across all subspecialties.

• RadReport.org: Maintained by the RSNA, this is the go-to source for standardized, best-practice templates.
• Radiology Templates (AU): An excellent, user-friendly library maintained by Australian radiologists with a slightly different flavor and organization.

5. The Next-Level Move: Free-Form Dictation to Structured Report

The biggest drag on call isn’t reading the scan; it’s the documentation. You see the findings, but getting them into a perfectly structured report that your attending will sign without a dozen edits is a separate skill. You dictate the positive findings—”dilated CBD to 12 millimeters with a 6-millimeter distal stone”—and then spend time formatting, structuring, and adding the standard language.

This is the workflow that GigHz Precision AI is designed to streamline. You dictate your positive findings in free form, just as you see them. The AI then generates a complete, structured report using pre-loaded templates from the ACR and SIR. It handles the formatting, measurements, and standard phrasing, letting you focus on the diagnostic interpretation. While this MRCP template doesn’t have a specific Clinical Decision Support (CDS) popup, for other studies with scoring systems (like LI-RADS or Bosniak), the appropriate CDS fires automatically based on your findings.

6. When Should You Order an MRCP? ACR Appropriateness Criteria

Knowing when MRCP is the right next step is key. The American College of Radiology (ACR) provides evidence-based guidelines for common clinical scenarios.

For a patient presenting with Jaundice, MRCP is Usually Appropriate when mechanical obstruction is suspected based on initial imaging (like a dilated duct on ultrasound) or lab values. It’s also considered Usually Appropriate for initial imaging in patients with Right Upper Quadrant Pain where biliary disease is suspected, especially after an inconclusive ultrasound.

In the workup of pancreatitis, MRCP plays a crucial role. For suspected Chronic Pancreatitis or its complications, MRCP is Usually Appropriate. A secretin-stimulated MRCP can provide functional information about pancreatic duct outflow, which is particularly useful in these cases.

MRCP is also the primary modality for evaluating pancreatic cysts. For incidentally detected cysts of any size, or for follow-up imaging of known cysts, MRCP is rated Usually Appropriate. It excels at determining if a cyst communicates with the main pancreatic duct, a key feature for diagnosing and risk-stratifying an IPMN.

While MRCP is excellent for diagnosis, it’s not therapeutic. The gold standard for intervention (like stone removal or stenting a stricture) is ERCP, which is invasive. Endoscopic ultrasound (EUS) is often better for evaluating small CBD stones and characterizing pancreatic masses. When MRI is contraindicated, CT cholangiography can be an alternative.

7. MRCP (Magnetic Resonance Cholangiopancreatography) Imaging Protocol — Phases, Contrast, and Reconstructions

The standard MRCP protocol is performed without IV contrast and relies on the natural high T2 signal of bile and pancreatic fluid. Patient prep is important: NPO for 4-6 hours helps distend the gallbladder and reduces stomach fluid, which can obscure the biliary anatomy. Some institutions give pineapple juice before the scan to suppress the T2 signal from the stomach and duodenum.

The protocol is built around a series of heavily T2-weighted sequences to generate both 2D and 3D views of the ductal systems.

Common protocol pitfalls: The most common mistake I see residents make is relying solely on the 3D MIP (Maximum Intensity Projection) reconstructions. Small stones can easily be hidden by overlapping ducts on a MIP. You have to scroll through the thin-slice 3D source axial images—that’s where the real pathology lives. Also, remember that secretin isn’t routine; it’s an add-on for specific questions about pancreatic function or anatomy like pancreas divisum, not for a simple stone hunt.

8. The 3-Months-Free Residents Offer

3+ months free for radiology residents and fellows

Look like a rockstar on your reports. With the GigHz Radiology Report Assistant, you can dictate your positive findings in free form, and the AI generates a complete, structured report using ACR and SIR templates. For relevant studies, the appropriate Clinical Decision Support (CDS) like LI-RADS or TI-RADS fires automatically, embedding the correct classification and follow-up recommendations right into your impression.

All we ask in return is your feedback so we can keep improving the product for trainees. To get started, we just need three things:

1. Your PGY year (e.g., PGY-2, PGY-4)
2. Your training type (radiology residency or fellowship specialty)
3. Your training program / hospital name

There’s no credit card required and no long forms. Just reply to the application with those three items, and we’ll get you set up. You can apply for the residents free-access program here.

9. Frequently Asked Questions

Is it HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. No patient-identifying information is required or stored, ensuring compliance with HIPAA privacy and security standards.

Do I need IT to set it up?

No. GigHz Precision AI is browser-based and requires no local software installation or special permissions from your hospital’s IT department. It works on any modern computer, including the call-room PC or your personal iPad.

Does it work with PowerScribe or other dictation software?

Yes. It works alongside your existing dictation system. You dictate your findings, and the AI generates the structured report, which you can then copy and paste directly into your PACS/RIS. It complements your existing workflow rather than replacing it.

Can I use my own templates?

Yes. While the system comes pre-loaded with ACR and SIR standard templates, you can customize them or upload your own preferred templates to match your institution’s or your personal style.

What happens after my residency or fellowship ends?

The free access is for the duration of your training. After you graduate, you can transition to a paid plan for practicing radiologists. We offer discounts for recent graduates to help you get started in your new role.