tentorial herniation

herniation /her·ni·a·tion/ (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.

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herniation of intervertebral disk  herniated disk; protrusion of the nucleus pulposus or anulus fibrosus of the disk, which may impinge on nerve roots.

herniation of nucleus pulposus  see h. of intervertebral disk.

tentorial herniation  downward displacement of the most medially placed cerebral structures through the tentorial notch, caused by a supratentorial mass.

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tentorial herniation

[tentôr′ē·əl]

Etymology: L, tentorium, tent, hernia, rupture

the protrusion of brain tissue into the tentorial notch, caused by increased intracranial pressure resulting from edema, hemorrhage, or a tumor. Characteristic signs are severe headache, fever, flushing, sweating, abnormal pupillary reflex, drowsiness, hypotension, and loss of consciousness. Also called transtentorial herniation.