Case contributed by A.Prof Frank Gaillard

1. standard measurement: angle formed by line joining the nasion with the center of the pituitary fossa and a
line joining the anterior border of the foramen magnum with the center of the pituitary fossa. (Normal 125°–143°, Platybasia >143°, Basilar kyphosis <125°)

2. modified measurement: 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. (normal value range (95% C.I) 116°-118° for adults and 113°-115° for children.)


Platybasia, also a degree of basilar invagination and a small syrinx.

PlayAdd to Share

Case information

rID: 2651
Case created: 7th May 2008
Last edited: 1st Oct 2015
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.