Balaclava Helmet
Balaclava Helmet
A pattern of facial sensory loss resembling in distribution a balaclava helmet, involving the outer parts of the face but sparing the nose and mouth, may be seen with central lesions, such as syringobulbia which progress upwards from the neck, such that the lowermost part of the spinal nucleus of the trigeminal nerve which serves the outer part of the face is involved while the upper part of the nucleus which serves the central part of the face is spared. This pattern of facial sensory impairment may also be known as onion peel or onion skin.
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