Footnotes

• Twitter @drs_mullen

• Contributors SM and DCM sharing responsibility for development of manuscript, article content and educational approach. NC provided imaging and corresponding labelling of salient abnormalities.

• 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.