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Contributors All the authors were involved in conception and drafting of the work. BT was involved in collection of data and writing. RN was the pathology consultant who diagnosed and signed off the report. SD and SKS were involved in the clinical management of patient.
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 for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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