MRI of the incisural plane: assessment of normal brain stem position by age and transtentorial brain stem shift in disease
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The standardization on MRI of an anatomic plane passing through the tectum of the midbrain based on fixed landmarks allows assessment of the position of the brain stem during development and in normal adulthood, and comparison with its position in disease states. The level of the tectum relative to this incisural plane changes during normal cranial growth as well as in the presence of masses, frank brain stem herniation correlating with altered consciousness.
Key wordsBrain stem Tentorial hiatus Herniation
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