Footnotes

• Contributors The case for this manuscript was identified by DB. DB, JC and JB were involved in managing the case. The manuscript was drafted by AH. Radiographic images were selected and annotated by MD. Histology images were selected and annotated by YC. All authors were involved in editing of the manuscript, and gave final approval for publishing.

• Competing interests None declared.

• Patient consent Obtained.

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