Footnotes

• Contributors RP prepared the manuscript and procured the clinical and radiological images. RB diagnosed the case at the outpatient clinic. AB conceptualised the manuscript and provided overall guidance.

• 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 Obtained.

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