Diffusion-weighted magnetic resonance imaging indicates the severity of acute pancreatitis

Area of Science:

• Radiology
• Medical Imaging
• Gastroenterology

Background:

• Acute pancreatitis (AP) diagnosis and severity assessment are crucial for patient management.
• Differentiating mild AP from necrotizing AP (nAP) is essential for treatment decisions.
• Conventional imaging methods like contrast-enhanced MRI or CT may have limitations or contraindications.

Purpose of the Study:

• To evaluate the utility of diffusion-weighted magnetic resonance imaging (DW-MRI) in distinguishing between varying degrees of acute pancreatitis severity.
• To assess the correlation between apparent diffusion coefficient (ADC) values and specific pancreatic tissue patterns.

Main Methods:

• A study involving 36 patients: 15 with mild AP (mAP), 8 with nAP, and 15 normal controls (nP).
• DW-MRI and magnetic resonance cholangiopancreatography were performed on all participants.
• Pancreatic segments were classified into three patterns: normal (1), mild inflammation (2), and necrosis (3), with ADC measurements recorded.

Main Results:

• A total of 108 pancreatic segments were analyzed.
• Similar ADC values were observed in pattern 1 segments for both nP and mAP groups (P = 0.29).
• Significantly different ADC values were found across the three image patterns (P < 0.001), with significant signal intensity differences between all patterns (P < 0.05).

Conclusions:

• DW-MRI is a safe and effective imaging modality for differentiating pancreatic tissue patterns in patients with mAP, nAP, and nP.
• ADC measurements provide precise differentiation between normal, inflamed, and necrotic pancreatic tissue.
• DW-MRI is particularly valuable for patients with contraindications to contrast-enhanced imaging.