platybasia


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platybasia

 [plat″ĭ-ba´zhah]
malformation of the base of the skull due to softening of skull bones or a developmental anomaly, with bulging upwards of the floor of the posterior cranial fossa adjacent to the foramen magnum, upward displacement of the upper cervical vertebrae, and bony impingement on the brainstem, accompanied by neurologic signs referable to the medulla oblongata. See also basilar invagination. Called also basilar impression.

plat·y·ba·si·a

(plat'i-bā'sē-ă),
A developmental anomaly of the cranium or an acquired softening of the cranial bones so that the floor of the posterior cranial fossa bulges upward in the region about the foramen magnum.
[platy- + G. basis, ground]

plat·y·ba·si·a

(plat'i-bā'sē-ă)
A developmental anomaly of the cranium or an acquired softening of the cranial bones that allows the floor of the posterior cranial fossa to bulge upward in the region around the foramen magnum.
[platy- + G. basis, ground]
References in periodicals archive ?
In June 2019 Rachel saw another neurologist, who diagnosed her with platybasia, a flattening of the skull base, and basilar invagination, an infolding of the base of the skull, which occurs when one of the vertebra migrates upwards.
Skull x-ray showed wormian bones but there was no platybasia. There was a significant reduction of the femoral neck angle bilaterally.
Evaluation of platybasia in patients with idiopathic trigeminal neuralgia.
Cervical vertebral fusions occur in 20 to 35% of cases, whereas platybasia and occipitalization of the atlas are found in about 30% (6).
Basal skull and cervical spine CT findings include spinal canal stenosis, mild platybasia with angulation and compression into the cervicomedullary junction, and downward displacement of the cerebellar tonsils (Figure 4).
Coronal Reformat Cervical spine (b) shows mild platybasia with angulation at the CVJ junction and spinal canal stenosis.
Basilar impression (platybasia): a bizarre developmental anomaly of the occipital bone and upper cervical spine with striking and misleading neurologic manifestations.
As a result, frontal bossing, compression of the fourth ventricle or flattening at the base of the skull (platybasia) can occur.