Footnotes

• Contributors XX and SZ: cared for the patient and collected the data for the manuscript. XX: wrote the manuscript. Both authors discussed the patient’s diagnosis and treatment, and revised 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.

• Patient consent for publication Parental/guardian consent obtained.

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