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MR cholangiopancreatography (MRCP)
MR Cholangiopancreatography (MRCP) = a specialised MRI technique focusing on the liver, bile ducts, gallbladder, pancreas, and pancreatic ducts. Non-invasive alternative to ERCP → no endoscope, no iodinated contrast needed. Based on heavily T2-weighted MRI sequences → fluid (bile, pancreatic juice) appears bright → ducts are well visualised.
🎯 Indications
- 🪨 Choledocholithiasis: Detect + localise CBD stones.
- ➖ Biliary strictures: Assess benign vs malignant narrowing.
- 💥 Trauma: Evaluate biliary/pancreatic duct injury.
- 🔥 Chronic pancreatitis: Show ductal changes, strictures, stones.
- 🧬 Congenital anomalies: e.g. choledochal cysts, Caroli’s disease.
- 🩺 Post-surgical anatomy: After cholecystectomy, transplant, biliary diversion.
- 🔀 Pancreas divisum: Failure of duct fusion (important cause of recurrent pancreatitis).
- 💧 Pancreatic cystic lesions: Assess communication with ducts.
- ⚠️ Anomalous pancreaticobiliary junction: Pre-cancerous risk factor.
🖼️ Imaging Details
- Uses heavily T2-weighted sequences → static/dilated fluid = bright.
- Stones = signal voids (dark spots) within bright bile.
- Thin-slice 3D reconstructions give detailed “cholangiogram-like” images of biliary tree + pancreatic duct.
- No ionising radiation → suitable for younger patients and follow-up.
🛠️ Preparation
- ⏱️ Fast ≥4 hours → reduces bowel peristalsis and fluid artefact.
- 🍐 Promotes gallbladder distension → better ductal visualisation.
- Some centres use negative oral contrast (e.g. pineapple juice 🥤, iron oxide solutions) to suppress duodenal fluid signal.
📌 Key Teaching Points
- ✅ MRCP = first-line for ductal imaging when ERCP is not immediately indicated.
- ✅ ERCP is now mainly therapeutic (stone removal, stenting), not diagnostic.
- 🚩 MRCP cannot biopsy → tissue diagnosis still requires ERCP/EUS.
| The content on this website is provided for educational and informational purposes only to support exam preparation (e.g., MLA, MRCP, USMLE) and learning. This is NOT medical advice, diagnosis, treatment, or professional guidance. It does not replace consultation with a qualified healthcare professional, official guidelines (e.g., NICE, GMC, BNF), or supervised clinical practice. Always verify information with current, authoritative sources. Makindo and its contributors accept no liability for any reliance on this content, including errors, omissions, or any resulting harm, loss, or consequences. By using this site, you agree to these terms. |
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