Conflict of interest
Nozomi Kawanami, Tsuyoshi Yoshimuta, Takako Minami, Satoshi Ikeda, Hiroaki Kawano, Koji Maemura, and Kiyoyuki Eishi all declare that they have no conflicts of interest.
This article does not contain any studies with human or animal subjects performed by any of the authors. Written approval was obtained from the patient. Our institution currently does not require Ethics Committee approval for image reports.