Footnotes

• Contributors NK prepared the manuscript, formatted it for publication and reviewed it in its final form. AR provided content input, formatted the radiology figures, edited the manuscript and reviewed it in its final form. YL and SM provided content input, formatted the pathology figures, edited the manuscript and reviewed it in its final form. OE oversaw the conception, writing, formatting, editing and review of the manuscript in its final form.

• 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.