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ascending_transtentorial_herniation

Ascending transtentorial herniation

Transtentorial herniation can occur when the brain moves either up or down across the tentorium, called ascending and descending transtentorial herniation respectively; however descending herniation is much more common.

Radiographic features

General imaging features include

Flattening or reversal of the smile shaped quadrigeminal cistern.

Obliteration of the quadrigeminal and superior cerebellar cistern in severe cases

“spinning top” appearance of midbrain due to bilateral compression of the posterior aspect of the midbrain may be associated with infarct in the territory of posterior cerebral and superior cerebellar arteries hydrocephalus as the result of the pressure of the cerebellum on the cerebral aqueduct

Cranial shift of vermis and parts of superomedial cerebellar hemisphere through tentorium incisura

Compressed superior cerebellar, vermian cisterns and forth ventricle

spinningtop.jpg

ascending_transtentorial_herniation.txt · Last modified: 2017/09/19 13:58 by administrador