transtentorial herniation


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herniation

 [her″ne-a´shun]
abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering membrane, muscle, or bone. (See also hernia.)
Herniation syndromes. From Ignatavicius and Workman, 2002.
caudal transtentorial herniation transtentorial herniation.
central herniation a downward shift of the brainstem and the diencephalon due to a supratentorial lesion, causing Cheyne-Stokes respirations with pinpoint nonreactive pupils.
cingulate herniation a shift of the cingulate gyrus to below the falx cerebri.
disk herniation (herniation of intervertebral disk) (herniation of nucleus pulposus) herniated disk.
tentorial herniation transtentorial herniation.
tonsillar herniation protrusion of the cerebellar tonsils through the foramen magnum.
transtentorial herniation downward displacement of medial brain structures through the tentorial notch by a supratentorial mass, exerting pressure on the underlying structures, including the brainstem; this is a life-threatening situation because of pressure on the third cranial nerve, with symptoms including dilated, nonreactive pupils, ptosis, and a decreased level of consciousness. Called also caudal transtentorial herniation, tentorial herniation, and uncal herniation.
uncal herniation transtentorial herniation.

trans·ten·to·ri·al her·ni·a·tion

herniation into the incisura, either from above (rostral transtentorial herniation) or below (caudal transtentorial herniation).

transtentorial herniation

Cerebellar herniation Neurology Brain herniation that occurs when part of the cerebellum is displaced through the foramen magnum, compressing the brainstem, causing death by destroying the respiratory center. Cf Uncal herniation.
References in periodicals archive ?
Each is associated with vasogenic edema, but there is no midline shift or subfalcine or transtentorial herniation.
Ascending transtentorial herniation, significant mass effect, distortion of the brainstem and fourth ventricle, moderate supratentorial ventricular dilatation, and associated sulcal/meningeal enhancement occurred.
Left uncal herniation and descending transtentorial herniation were noted.
MRI can be useful in revealing a deformity or injury of the cerebral peduncle that results from ongoing or past transtentorial herniation. (2-6)