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Handling editor Josef S Smolen
Contributors SC: clinician, consenting of patient, writing up of case. GM: clinician, editing case write up, liaising with radiology for best images. PD: radiology images and description.
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.