Footnotes

• Contributors MM conceptualised and designed the study, and drafted the initial manuscript. CM carried out the MRI and CT studies, reviewed and revised the manuscript and contributed to the preparation of figures. GV performed the ultrasonography studies and contributed to the editing of the manuscript. SM carried out the MRI and CT studies, and took part in the preparation of the manuscript. DA performed the laparoscopic exploration and critically reviewed the manuscript. EM was responsible for the clinical management of the patient, reviewed and revised the manuscript. AS was responsible for the clinical management of the patient, conceptualised and designed the study, and critically reviewed the manuscript.

• Competing interests None declared.

• Patient consent Parental/guardian consent obtained.

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