User talk:Neurosurgeryislife

CRANIAL VAULT LINES

CRANIOMETRIC POINTS - PTERION - POINT OF ENCOUNTER OF GREAT WING SPHENOID,FRONTAL, PARIETAL AND TEMPORAL - ASTHERION - WHERE THE STREETS HAVE NO NAME - NOT RELIABLE ( UNION OF LAMBDOID,OCCIPTOMASTOID AND PARIETOMASTOID) - VERTIX (THE HIMALAIA OF SKULL) HIGHER POINT OF SKULL - LAMBDA - UNION OF SAGITAL SUTURE AND LAMBDOID (POSTERIOR POINT) -STEPHANION - UNION OF CORONAL SUTURE AND SUPERIOR TEMPORAL LINE -OPISTHION - POSTERIOR MARGIN OF MAGNUM FORAMEN ON THE MIDLINE --BASION  - THE MIDLINE POINT OF ANTERIOR MARGIN OF MAGNUM FORAME. -SAGITAL SUTURE - !!!! SSS LIES AT RIGHT TO SSS - > 11 MM.

SKULL LAND MARKS. 'MACRAE´s line' is a radiographic line drawn on a lateral skull radiograph or midsagittal section of CT or MRI                    joining the basion and opisthion.
 * Normal position of the tip of dens is 5mm below this line
 * If the tip of the dens migrates above this line it indicates the presence of basilar invagination (atlanto-axial impaction).

Chamberlain line is a line joining the back of hard palate with the opisthion on a lateral view of the craniocervical junction.

Significance It helps to recognise basilar invagination which is said to be present if the tip of the dens is >3 mm above this line. McGregor developed a modification of the Chamberlain line for when the opisthion could not be identified on plain radiographs

Various lines and measurements using the basion are made in the diagnosis of  atlanto-occipital dissociation (AOD) injuries, platybasia and basilar invagination: basion-dens interval (BDI) basion-axial interval (BAI) Powers ratio Boogards angle McRae line