Kernohan's notch

Kernohan's Notch

Kernohan's Notch (pronunciation: ker-no-han's notch) is a medical term referring to a phenomenon observed in certain cases of brain herniation.

Etymology

The term is named after the American neurosurgeon, James Watson Kernohan, who first described the condition in 1929.

Definition

Kernohan's Notch is a groove or indentation in the cerebral peduncle caused by pressure exerted by the tentorium cerebelli during a transtentorial herniation. This pressure is typically the result of a space-occupying lesion, such as a brain tumor or hematoma, which pushes the brain across structures within the skull.

Clinical Significance

The presence of a Kernohan's Notch is clinically significant as it can cause paralysis on the same side of the body as the brain lesion, a phenomenon known as Kernohan's Notch Syndrome or Kernohan's phenomenon. This is an unusual occurrence as brain lesions typically cause symptoms on the opposite side of the body.

Related Terms

• Brain Herniation
• Cerebral Peduncle
• Tentorium Cerebelli
• Transtentorial Herniation
• Brain Tumor
• Hematoma
• Paralysis
• Kernohan's Notch Syndrome

External links

• Medical encyclopedia article on Kernohan's notch
• Wikipedia's article - Kernohan's notch

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