Footnotes

• Handling editor Iskander Chaudhry.

• Contributors JL made the diagnosis, prepared the manuscript, recorded clinical information and provided the figures. LA diagnosed and provided CT scans.

• 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.