basilar invagination

basilar invagination
a developmental deformity of the occipital bone and upper end of the cervical spine in which the latter appears to have pushed the floor of the occipital bone upward; see also platybasia. Called also basilar impression.

Medical dictionary. 2011.

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  • basilar impression — 1. platybasia. 2. basilar invagination …   Medical dictionary

  • invagination — 1. The ensheathing, enfolding, or insertion of a structure within itself or another. 2. The state of being invaginated. SEE ALSO: introversion, intussusception. basilar i. SYN: platybasia. * * * in·vag·i·na·tion .vaj ə nā shən n …   Medical dictionary

  • platybasia — A developmental anomaly of the skull or an acquired softening of the skull bones so that the floor of the posterior cranial fossa bulges upward in the region about the foramen magnum. SYN: basilar invagination. [platy …   Medical dictionary

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  • impression — 1. A mark seemingly made by pressure of one structure or organ on another, seen especially in cadaveric dissections. See also groove for the various impressions of the lungs, e.g., descending aorta, subclavian artery, and vena cavae. 2. An …   Medical dictionary

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