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Procerus sign
Medical condition From Wikipedia, the free encyclopedia
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The procerus sign (vertical wrinkling of the forehead) is a medical sign consisting of vertical forehead wrinkling around the bridge of the nose and the glabella. This can be seen in neurodegenerative diseases such as progressive supranuclear palsy.
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Definition
The procerus sign is defined as wrinkling around the bridge of the nose and the glabella.[1]
Differential
The procerus sign can be seen in neurodegenerative diseases such as progressive supranuclear palsy (PSP).[2] It is highly specific to PSP compared to other disorders involving Parkinsonism.[1]
Mechanism
Dystonia of the procerus muscle or the corrugator supercilii muscle leads to abnormal muscle contraction.[1] It is present both when the eyes are open and when they are closed, including during blinking.[3]
History
The procerus sign may also be known as "vertical wrinkling of the forehead" because it often does not just involve the procerus muscle.[1]
References
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