Footnotes

• Contributors All authors contributed equally to the manuscript. GM wrote the case. KT wrote the explanation. WW edited the paper, obtained consent and images from the patient, and coordinated submission.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None declared.

• Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

• Provenance and peer review Not commissioned; internally peer reviewed.