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Old 07-15-2015
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Default Kernohan notch

Can someone please explain to me the kernohan notch and why does it give a 'false localization' sign. Much appreciated.
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Old 07-16-2015
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When there is a tumor on the right side of the brain it can cause a herniation or push the brain on the opposite side of the space occupying lesion into the foramen magnum edge and this basically cut the nerve pathways running on the opposite side of the space occupying lesion. So if the upper motor neurons or the sensory neurons were cut on that opposite side you would see paralysis on the side of the space occupying lesion because remember they cross at the medulla below the foramen magnum. This would be a false localizing sign because it looks like the primary space occupying lesion is on the side of the nerve damage but really it's on the opposite side of that and it's pushing the side opposite of the space occupying lesion into the edge of the foramen magnum therefore causing the damage.

Last edited by ucheeee; 07-16-2015 at 11:47 PM.
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talal.eljabri (07-18-2015)
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Old 07-19-2015
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Did that make any sense?
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Old 08-23-2015
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yes it did,, many thanks.
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