Platybasia is characterised by abnormal flattening of the skull base as defined as a base of skull angle over 143º.
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Clinical presentation
Platybasia alone does not usually cause symptoms unless it is associated with basilar invagination 6.
Pathology
Aetiology
- congenital
- acquired
Associations
Radiographic features
A number of techniques have been described to measure platybasia 1.
- standard measurement: the angle formed by a line joining the nasion with the centre of the pituitary fossa and a line joining the anterior border of the foramen magnum with the centre of the pituitary fossa 1
- normal 125°–143°
- platybasia >143°
- basilar kyphosis <125°
- modified measurement: the angle formed by a line extending across the anterior cranial fossa to the tip to the dorsum sellae and a line drawn along the posterior margin of the clivus 1
- adult normal value range: 116°-118°
- children normal range: 113°-115°
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