- Lorna Luo, medical student1,
- Senthil K Selvanathan, specialist registrar in neurosurgery2
- 1Medical School, University of Leeds, Leeds, UK
- 2Department of Neurosurgery, Leeds General Infirmary, Leeds LS1 3EX, UK
- Correspondence to: S K Selvanathan senthil-kumar{at}doctors.org.uk
Identify the structures labelled A, B, C, D, …
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