1 Department of Radiology, Chiba University Hospital, 1-8-1, Inohana, Chuo-ku, Chiba City, Chiba, 260-8677, Japan; Department of Diagnostic Ultrasound & Interventional Radiology, Cancer Institute Hospital of Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo, 135-8550, Japan. Electronic address: s.tsuchiya624@gmail.com.
2 Department of Radiology, Chiba University Hospital, 1-8-1, Inohana, Chuo-ku, Chiba City, Chiba, 260-8677, Japan.