Received: 30 July 2020
Accepted: 30 November 2020
First Online: 7 December 2020
Ethics approval and consent to participate
: According to the Ethical Guidelines for Medical and Health Research involving Human Subjects in Japan, ethical approval is not required for case reports.
: Written informed consent was obtained from the son of the patient for the publication of this case report and any accompanying test results.
: The author declares no competing interests.