[1] Univ Tokyo, Inst Med Sci, Dept Radiol, Tokyo 1088639, Japan
[2] Univ Tokyo, Grad Sch Med, Dept Radiol, Tokyo 1088639, Japan
[3] Univ Tokyo, Grad Sch Med, Dept Dermatol, Tokyo 1088639, Japan
[4] Teikyo Univ, Chiba Med Ctr, Dept Radiol, Chiba, Japan
[5] Osaka Univ, Grad Sch Med, Fac Med, Dept Radiol, Osaka, Japan