Kernohan's notch
Brain injury symptom / From Wikipedia, the free encyclopedia
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Kernohan's notch is a cerebral peduncle indentation associated with some forms of transtentorial herniation (uncal herniation).[1][2] It is a secondary condition caused by a primary injury on the opposite hemisphere of the brain.[3] Kernohan's notch is an ipsilateral condition, in that a left-sided primary lesion (in which Kernohan's notch would be on the right side) evokes motor impairment in the left side of the body and a right-sided primary injury evokes motor impairment in the right side of the body.[4] The seriousness of Kernohan's notch varies depending on the primary problem causing it, which may range from benign brain tumors to advanced subdural hematoma.