MR Imaging for Early Extrapancreatic Necrosis in Acute Pancreatitis
Ting Zhou1, Meng-Yue Tang1, Yan Deng1
1Sichuan Key Laboratory of Medical Imaging and Department of Radiology, Affiliated Hospital of North Sichuan Medical College, No. 63, Wenhua Road, Nanchong, Sichuan 637000, China.
Rationale And Objectives:
To study the MRI characteristics of early extrapancreatic necrosis and compare them with those of peripancreatic fluid collections in acute pancreatitis (AP).
Materials And Methods:
This retrospective study enrolled 70 AP patients who had extrapancreatic collections visible on MRI within 1 week of onset. Extrapancreatic collections were divided into extrapancreatic necrosis and peripancreatic fluid collections based on follow-up MRI, CT, or pathology. The number and area of extrapancreatic collections, extrapancreatic inflammation on MRI (EPIM) score, MR severity index score and clinical characteristics were evaluated and compared between the two groups.
Results:
Of the seventy AP patients, 32 (45.7%) had extrapancreatic necrosis, and 38 (54.3%) had peripancreatic fluid collections. The number and area of extrapancreatic collections, MR severity index score, EPIM score, and prevalence of associated hemorrhage were significantly higher in extrapancreatic necrosis patients than in those with peripancreatic fluid collections (p < 0.001). Among the single indicators, the accuracy of the area of extrapancreatic collections (AUC = 0.871) was comparable to that of the EPIM score for predicting extrapancreatic necrosis and was significantly higher than that of the other two indicators. The combination of all indicators showed the highest predictive accuracy (AUC = 0.949), and combinations of two or more indicators demonstrated significantly higher predictive accuracy for extrapancreatic necrosis than any single indicator (p < 0.05) except for the area of extrapancreatic collections (p > 0.05).
Conclusion:
The MRI characteristics have the potential to differentiate early extrapancreatic necrosis from peripancreatic fluid collections and help indicate extrapancreatic necrosis.
Insights
Magnetic resonance imaging (MRI) can differentiate early extrapancreatic necrosis from fluid collections in acute pancreatitis (AP). Key MRI features, like collection area and EPIM score, help identify extrapancreatic necrosis.
Area of Science:
- Radiology
- Gastroenterology
- Medical Imaging
Background:
- Acute pancreatitis (AP) can lead to extrapancreatic complications.
- Distinguishing early extrapancreatic necrosis from fluid collections is crucial for management.
- Magnetic resonance imaging (MRI) offers detailed visualization of pancreatic and peripancreatic tissues.
Purpose of the Study:
- To investigate the MRI characteristics of early extrapancreatic necrosis.
- To compare these MRI findings with peripancreatic fluid collections in AP patients.
- To assess the diagnostic performance of MRI features in differentiating these conditions.
Main Methods:
- Retrospective analysis of 70 AP patients with extrapancreatic collections within 1 week of onset.
- Classification of collections into extrapancreatic necrosis or peripancreatic fluid based on follow-up imaging or pathology.
- Evaluation of collection number/area, EPIM score, MR severity index, and clinical data.
Main Results:
- Extrapancreatic necrosis (32 patients) showed significantly higher collection number/area, MR severity index, EPIM score, and hemorrhage prevalence than fluid collections (38 patients).
- Area of extrapancreatic collections (AUC=0.871) and EPIM score were accurate predictors of necrosis.
- Combination of all indicators achieved the highest predictive accuracy (AUC=0.949).
Conclusions:
- MRI characteristics can differentiate early extrapancreatic necrosis from peripancreatic fluid collections in AP.
- Specific MRI features, particularly collection area and EPIM score, are valuable indicators.
- Combining multiple MRI indicators enhances diagnostic accuracy for early extrapancreatic necrosis.
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