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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 27:258-260, February 2006
© 2006 American Society of Neuroradiology

CASE REPORT
HEAD AND NECK

Lhermitte Sign during Yawning Associated with Congenital Partial Aplasia of the Posterior Arch of the Atlas

T. Sagiuchi^a, S. Tachibana^a, K. Sato^a, S. Shimizu^a, I. Kobayashi^a, H. Oka^a, K. Fujii^a and S. Kan^b

^a Department of Neurosurgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
^b Department of Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan

Address correspondence to Takao Sagiuchi, MD, Department of Neurosurgery, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa, 228-8555 Japan

SUMMARY: We describe the case of a 26-year-old man who presented with symptoms compatible with Lhermitte sign that occurred during yawning. It was associated with congenital partial aplasia of the posterior arch of the atlas. Cervical multisection-detector CT myelography during yawning showed compression of the upper cervical cord due to the inward mobility of the isolated posterior tubercle. The symptoms completely disappeared following removal of the isolated posterior tubercle.