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]

platybasia

/platy·ba·sia/ (plat″ĭ-ba´zhah)
2. 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, upward displacement of the upper cervical vertebrae, and bony impingement on the brainstem.

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]

platybasia

malformation of the base of the skull, with forward displacement of the upper cervical vertebrae and bony impingement on the brainstem. It is accompanied by neurological signs referable to the medulla oblongata, cervical spinal cord and cranial nerves. Called also basilar impression.
References in periodicals archive ?
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).
If platybasia occurs, basilar invagination develops so that the odontoid process begins to extend upward as the skull sinks downward upon it.