Transtentorial Uncal and Hippocampal Herniation

A hemispheric mass lesion displaces the uncus and all or part of the hippocampus through the tentorial opening. Subsequently, the oculomotor nerve-roots are pressed against the rigid tentorial edge or the petrocli-noid ligament. The rostral brainstem with the aqueduct is compressed and displaced to the opposite side. This displacement allows the tentorial edge to lacerate the pyramidal fibers in the opposite pedunculus, producing the Kernohan's notch (see the section Localizing Features).

0 0

Post a comment