2024年6月22日 · Basilar invagination, also called basilar impression, is a congenital or acquired craniocervical junction abnormality where the tip of the odontoid process projects above the foramen magnum. The following terms are often used interchangeably because they describe upwards migration of the upper cervical spine, but they are not synonyms 7:

2024年7月16日 · Cranial settling occurs when the bone at the top of the neck on which the skull rotates (dens) extends into the foramen magnum. The conditions can be present at birth (congenital) or develop later in life (acquired) due to conditions that include rheumatoid arthritis and Paget’s disease.

2023年8月13日 · The basilar impression resulting from rheumatoid arthritis was originally termed “cranial settling” when Mathews and others interpreted odontoid migration to result from cranial descent due to eroded lateral atlantal masses.

2024年6月3日 · Basilar invagination is when the top of your spine gets pushed into the base of your skull. It leads to pinching or pressure on the brain stem, which is a bundle of nerves connecting the brain...

2018年1月19日 · Forms of Basilar Invagination now include the prolapse of the odontoid process through the foramen magnum (the original condition described by the term), cranial settling, a kyphotic clivo-axial angle, and a retroflexed odontoid [12].

2018年12月1日 · Basilar invagination results from migration of the entire spine into the skull base. Cranial settling is caused by C1–C2 instability, leading to upward migration and/or rotation of the C2 complex into the cranial vault. Platybasia results from …

In contrast to the brainstem getting pushed down into the foramen magnum as occurs in Chiari malformation, cranial settling shifts the position of the CCJ upward relative to the brainstem. The outcome is similar to basilar invagination and can cause hydrocephalus.

2023年4月3日 · It occurs both congenitally (i.e. basilar invagination associated with Down's syndrome, Klippel Feil syndrome, Chiari malformation (25-35% of BI), ) and in persons with bone diseases (basilar impression), such as rheumatoid arthritis (also called cranial settling), hyperparathyroidism, Paget's disease, Osteogenesis imperfecta (also associated ...

2023年2月12日 · Basilar invagination is an abnormality at the craniovertebral junction, either congenital (born with) or degenerative (aging/injury), resulting in the odontoid being out of place and protruding into the already limited space of the foramen magnum.

2016年6月25日 · Basilar impression occurs secondary by definition and involves the abnormal softening of the bone. One specific form is cranial settling, a term reserved for deformation of CVJ caused by rheumatoid arthritis.