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Sudden head drops and axial extensions were recently proposed as a pathognomonic clinical sign for chorea-acanthocytosis (NAC).1 Here, we challenge this observation, describing 3 patients with Huntington disease (HD) showing this sign as a major clinical feature. Moreover, we used EMG to clarify the mechanism of these involuntary movements.
Footnotes
Supplemental data at www.neurology.org
Author contributions: Francesca Morgante: study concept and design, acquisition of data, analysis and interpretation, critical revision of the manuscript for important intellectual content, study supervision. Paolo Girlanda: acquisition of data, analysis and interpretation, critical revision of the manuscript for important intellectual content. Davide Martino: study concept and design, acquisition of data, analysis and interpretation, critical revision of the manuscript for important intellectual content.
Study funding: No targeted funding reported.
Disclosure: F. Morgante served on a scientific advisory board for Allergan, received honoraria for speaking engagements from Lundbeck, Novartis, Medtronic, Chiesi Farmaceutici, and UCB pharma, and served on the editorial advisory board of Frontiers in Movement Disorders. P. Girlanda reports no disclosures. D. Martino received honoraria for speaking engagements from Chiesi Farmaceutici, UCB pharma, and the Movement Disorders Society, and served on the editorial advisory board of Frontiers in Movement Disorders. Go to Neurology.org for full disclosures.
- Received December 8, 2012.
- Accepted in final form April 4, 2013.
- © 2013 American Academy of Neurology
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