Early Findings
One of the first references to casual brain herniation was that of James Colier, who clearly described cerebellar tonsilar herniation in 1904. He observed accompanying false localyzing signs and commented:
- "In many cases of intracranial tumour of long duration, it was found postmortem that the posterior inferior part of the cerebellum had been pushed down and backwards into the foramen magnum and the medulla itself somewhat cadually displaced, the two structures together forming a cone-shaped plug tightly filling up the foramen magnum."
In 1920, Adolf Meyer confirmed the pathologies of brain herniation. He commented:
- "The falx and tentorium constitute an important protection against any sudden impacts of pressure by keeping apart heavy portions of the brain, but they also provide an opportunity for trouble in case of swelling or need of displacement."
The work of Collier and Meyer described ipsilateral hemiparesis, a false localizing sign. However, it became known as the Kernohan-Woltman phenomenon.
Read more about this topic: Kernohan's Notch, History
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