Fig. 4

Midsagittal reconstructed images of computed tomography scan of the posterior fossa and the craniovertebral junction demonstrating the measurements of various craniometric parameters in patients with craniovertebral junction malformations. a Klaus’ index—26.8 mm (decreased), b height of posterior fossa—29.1 mm (decreased), c Basal angle—143.2°(increased), d Boogard angle—142.7° (increased), e Nasion Basion Opisthion angle—172.1 (increased), f Foramen Magnum Angle—18.2° (increased), g Clivus Canal angle-111.8°(increased), h Clivopalatal angle—55.3(decreased), i Clivoodontoid angle – 120.7°(decreased)