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Egyptian Journal of Neurosurgery
Fig. 1 | Egyptian Journal of Neurosurgery

Fig. 1

From: Morphometric analysis of posterior cranial fossa and foramen magnum and it’s clinical implications in craniovertebral junction malformations: a computed tomography based institutional study in a tertiary care hospital of northern part of India

Fig. 1

Midsagittal reconstructed images of the computed tomography scan of the posterior fossa and the craniovertebral junction demonstrating the various linear craniometric parameters. a Twinning line (small thin white arrow);connecting the tuberculum sellae and the internal occipital protuberance, McRae’s line (thick arrow); connecting the basion to the opisthion, clivus length (long arrow); connecting the tip of the dorsum sellae to the basion. b Internal Occipital Protuberance-Opisthion (IOP-O) line (white arrow); connecting internal occipital protuberance to opisthion c Chamberlain’s line (white arrow); connecting between the posterior end of the hard palate and the opisthion d Klaus’ index (white arrow); perpendicular distance of the tip of the odontoid process from the twinning line e height of the posterior fossa (white arrow); perpendicular distance between McRae’s line and the twinning line

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