Footnotes

• Contributors EC, CFC and OB were involved in the diagnosis and treatment of the patient. NB made the pathology analysis. SC and OB were involved in the endoscopic workup. All the authors contributed significantly in the writing of the 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; internally peer reviewed.

• Patient consent for publication Parental/guardian consent obtained.