Footnotes

• Contributors AF cared for the patient, performed endoscopy and wrote the manuscript. BÖ cared for the patient and participated in writing the manuscript. DG performed imaging studies and reviewed the manuscript. TM performed surgery and reviewed the manuscript. SP performed histopatology and reviewed the manuscript. All authors approved the version submitted for publication.

• 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.