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Abstract #4096

Diffusion-weighted imaging in autoimmune pancreatitis: Which variable is most useful for differentiation from pancreatic cancer?

Yasunari Fujinaga 1 , Masaaki Takahashi 1 , Akira Fujita 1 , Sachie Fujita 1 , Shin Yanagisawa 1 , Hideaki Hamano 2 , Shigeyuki Kawa 3 , and Masumi Kadoya 1

1 Department of Radiology, Shinshu University, School of Medicine, Matsumoto, Nagano, Japan, 2 Department of Gastroenterology, Shinshu University Hospital, Matsumoto, Nagano, Japan, 3 Center for Health, Safety, and Environmental Management, Shinshu University, Matsumoto, Nagano, Japan

On diffusion-weighted imaging (DWI), the variables except for apparent diffusion coefficient (ADC) value have not been analyzed to differentiate autoimmune pancreatitis (AIP) from pancreatic cancer (PC). We aimed to analyze which variable was useful to differentiate AIP from PC on DWI. In 42 AIP patients and 50 PC patients who underwent 3-T MRI including DWI, variables such as ADC value, ADC ratio (ADC lesion /ADC spleen ), signal intensity (SI), SI ratio (SI lesion /SI spleen ) were compared between AIP and PC. Among 4 variables, the ADC value was most useful for differentiation because its area under the curve was highest in the ROC analysis.

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