Footnotes

• Contributors SR is the preliminary author of the article. Relevance and impact has been assessed by special radiology input from experts, CB and ME-D with edits to the initial writing.

• 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.