Footnotes

• AB and JP contributed equally to this study.

• Competing interests None declared.

• Patient consent Verbal consent obtained and family willing to sign consent as legal guardians, due to patient's dementia. Awaiting return of consent form.

• Ethics approval No intervention required—essentially a radiological case study. Verbal permission obtained and family willing to sign release of images.

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