Yasuhiro Sakai1,2, Makoto Ohta3, Yoshiaki Imamura2. 1. Department of Tumor Pathology, Faculty of Medical Sciences, University of Fukui, Eiheiji, Japan. 2. Division of Diagnostic Pathology/Surgical Pathology, University of Fukui Hospital, Eiheiji, Japan. 3. Department of Pathology, Fukui Red Cross Hospital, Fukui, Japan.