Footnotes

• Contributors JYP, HIK and SP treated the patient and collected the data for the manuscript. IL reviewed the radiology of the case. J-HK, YIH and SHJ contributed to analysis and interpretation. JYP and KJ oversaw the conception, writing, formatting and editing. All authors reviewed and approved the final manuscript.

• 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.

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