From the case: Kernohan phenomenon

Modality: MRI
Axial T1

Due to ...
Axial T1
Axial T1 Due to the mass effect of a large tumour the medial part (uncus) of the right temporal lobe (arrow) is herniating over the tentorium (*) in the foramen magnum, thereby compressing the mesencephalon against the free edge of the contralateral tentorium and causing a notch on the left side.
Modality: MRI (T1)

- “ Kernohan phenomenon is caused by an uncal transtentorial herniation causing compression of a cerebral peduncle (part of the mesencephalon). Conseq...”

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