作者单位:Department of Endoscopy and Ultrasound, Nara Medical University, Kashihara, Japan[1]Department of Radiology, Nara Medical University, 840 Shijo-cho, Nara Kashihara 634-8522, Japan[2]Department of Diagnostic Pathology, Nara Medical University, Kashihara, Japan[3]Third Department of Internal Medicine, Nara Medical University, Kashihara, Japan[4]