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Brain herniation is a potentially deadly side effect of very high pressure within the skull that occurs when a part of the brain is squeezed across structures within the skull. The brain can shift across such structures as the falx cerebri, the tentorium cerebelli, and even through the foramen magnum (the hole in the base of the skull through ...
Elevated ICP may result in uncal or tonsillar herniation, with resulting life-threatening brain stem compression. [11] Hakim's triad of gait instability, urinary incontinence, and dementia is a relatively typical manifestation of the distinct entity normal-pressure hydrocephalus.
Types of brain herniation [21] 1) Uncal 2) Central - The brainstem herniates caudally. 3) Cingulate herniation - The brain squeezes under the falx cerebri. 4) Transcalvarial herniation - through a skull fracture 5) Upward herniation of the cerebellum 6) Tonsillar herniation - the cerebellar tonsils herniate through the foramen magnum.
Herniation of cerebellar tonsils. [4] [38] [39] Tonsillar ectopia below the foramen magnum, with greater than 5 mm below as the most commonly cited cutoff value for abnormal position (although this is considered somewhat controversial). [27] [28] [40] [41] Syringomyelia of cervical or cervicothoracic spinal cord can be seen. Sometimes the ...
Kernohan's notch. 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 ...
Abnormal posturing. Traumatic brain injury, Stroke, Intracranial hemorrhage, Brain tumors, and Encephalopathy. Abnormal posturing is an involuntary flexion or extension of the arms and legs, indicating severe brain injury. It occurs when one set of muscles becomes incapacitated while the opposing set is not, and an external stimulus such as ...
Epidural hematoma is when bleeding occurs between the tough outer membrane covering the brain (dura mater) and the skull. [4] When this condition occurs in the spinal canal, it is known as a spinal epidural hematoma. [4] There may be loss of consciousness following a head injury, a brief regaining of consciousness, and then loss of ...
This may succeed or accompany temporal lobe (uncal) herniation and subfalcian herniation secondary to a supratentorial mass. [ citation needed ] The pathophysiological mechanism is uncertain [ 7 ] but is probably caused by the displacement of the brainstem stretching and tearing perforating branches of the basilar artery to the pons; venous ...