Pitfalls in MR cholangiopancreatographic interpretation

Area of Science:

• Radiology
• Medical Imaging
• Gastroenterology

Background:

• Magnetic resonance cholangiopancreatography (MRCP) is a key imaging modality for evaluating pancreatobiliary disorders.
• Despite its utility, MRCP is prone to numerous pitfalls that can mimic or obscure actual disease.
• Understanding these limitations is essential for accurate interpretation.

Purpose of the Study:

• To identify and describe common pitfalls encountered during MRCP examinations.
• To provide strategies for avoiding misinterpretation of MRCP findings.
• To enhance the diagnostic accuracy of MRCP in pancreatobiliary imaging.

Main Methods:

• Review of common MRCP artifacts and limitations.
• Discussion of specific scenarios leading to misdiagnosis.
• Presentation of techniques to overcome identified pitfalls.

Main Results:

• Maximum-intensity-projection (MIP) artifacts, variable T2 weighting, and incomplete imaging can obscure pathology.
• Limited spatial resolution hinders differentiation between benign and malignant strictures.
• Artifacts from metallic objects, gas, fluid, pneumobilia, and vascular compression can mimic or mask disease.

Conclusions:

• Awareness of potential pitfalls such as motion artifacts, susceptibility artifacts, and misinterpretation of normal variants is critical.
• Employing specific techniques like using multiple image angles, repeat imaging, and secretin administration can mitigate diagnostic errors.
• Accurate interpretation of MRCP requires a thorough understanding of its limitations and potential confounding factors.