Annals of Indian Academy of Neurology
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CLINICAL SIGN
Year : 2018  |  Volume : 21  |  Issue : 2  |  Page : 164-165

Procerus sign: Mechanism, clinical usefulness, and controversies


Department of Neurology, Royal Cornwall Hospital NHS Trust, United Kingdom

Correspondence Address:
Dr. Shakya Bhattacharjee
Royal Cornwall Hospital NHS Trust, Truro, Cornwall
United Kingdom
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/aian.AIAN_408_17

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This sign is observed in atypical parkinsonism mainly in Progressive Supranuclear Palsy. The exact mechanism of this sign is not clear but the contraction of the Corrugator Supercilii muscle is the most important factor for the generation of vertical forehead creases. Though the wrinkling of forehead is a complex phenomenon involving multiple muscles but the 'Corrugator sign' would be a better term to describe this phenomenon. Despite the controversies regarding the mechanism and nomenclature, the 'Procerus sign' remains an important clinical clue for early Progressive Supranuclear palsy.


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