Endgames Anatomy quiz

Oblique radiograph of the normal lumbar spine

BMJ 2012; 345 doi: http://dx.doi.org/10.1136/bmj.e7564 (Published 09 November 2012) Cite this as: BMJ 2012;345:e7564
  1. Himanshu Sharma, consultant orthopaedic spinal surgeon1,
  2. Julia Park, general practitioner trainee year 12,
  3. Daniel Benson, medical student3
  1. 1Spinal Unit, Derriford Hospital, Plymouth Hospitals NHS Trust, Plymouth PL6 8DH, UK
  2. 2Department of Trauma and Orthopaedic Surgery, Western Infirmary, Glasgow, UKA3
  3. 3Glasgow University, Glasgow
  1. Correspondence to: H Sharma wardround{at}yahoo.co.uk

Identify the structures labelled A-F in this oblique radiograph of the normal lumbar spine.

Answer

This is the pars interarticularis (part between the two articular processes) of the vertebra, also known as the “Scottish terrier dog sign.”

  • A: Superior articular process (forms the ear)

  • B: Pedicle (forms the eye)

  • C: Transverse process (forms the nose)

  • D: Pars interarticularis (forms the neck). The sign of a “neck break” is indicative of spondylolysis

  • E: Lamina (forms the body)

  • F: Inferior articular process (forms the foreleg)

Notes

Cite this as: BMJ 2012;345:e7564