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28 cze 2024 · The midbrain, or mesencephalon (plural: mesencephala or mesencephalons), is the most rostral part of the brainstem and sits above the pons and is adjoined rostrally to the thalamus. During development, the midbrain forms from the middle of three vesicles that arise from the neural tube.
23 lut 2022 · The hummingbird sign, also known as the penguin sign, refers to the appearance of the brainstem in patients with progressive supranuclear palsy (PSP). The atrophy of the midbrain results in a profile of the brainstem (in the sagittal plane) in which the preserved pons forms the body of the bird, and the atrophic midbrain the head, with beak ...
5 mar 2024 · the midbrain to pons ratio is the midbrain short-axis divided by the pontine short-axis; Note that this method measures only the basis pontis whereas the method of Oba et al. also includes the area of the pontine tegmentum.
30 lip 2024 · Midbrain sagging. In more severe cases of SIH, the brain is displaced downwards, leading to compression of the brainstem against the skull base. This finding is referred as “brainstem slumping” or “midbrain sagging” and is considered specific for intracranial hypotension.
8 lip 2019 · This article presents the developmental anatomy of the brainstem and discusses associated pathologic syndromes. Congenital and acquired syndromes are described and correlated with anatomic locations at imaging, with diagrams to provide a reference to aid in radiologic interpretation. © RSNA, 2019.
14 maj 2013 · MRI-based measurements used to diagnose progressive supranuclear palsy (PSP) typically lack pathologic verification and are not easy to use routinely. We aimed to develop in histologically proven disease a simple measure of the midbrain and pons on sagittal MRI to identify PSP.
1 cze 2004 · This sign is based on the observation that, in PSP, the atrophic midbrain (besides reduced AP diameter) shows a characteristic alteration in the normal convex profile of its superior surface, which tends to assume a flat or concave aspect on midline sagittal T1-weighted sections (Fig 1).
