Posterior cranial fossa morphometry in symptomatic adult Chiari I malformation patients: Comparative clinical and anatomical study

Chiari type I malformation with high foramen magnum anomaly

“…The mean PCF volumes previously reported in CT and magnetic resonance-based measurements of 186 cm 3 by Nishikawa et al [7], 174 ± 25 cm 3 by Noudel et al [8] and 166 ± 8 cm 3 by Milhorat et al [5] and 165.57 ± ± 19.37 cm 3 by Vurdem et al [11]. As for our finding, PCF volume was 100.91 cm 3 .…”

“…Total ICV and PCF volumes were 1609.15 cm 3 and 100.91 cm 3 , respectively. The length of tonsil herniation was 1.69 cm.…”

“…Dagtekin et al [3] examined 15 adult patients with CMI. Multiple measurements were made on magnetic resonance images.…”

“…In clinical and experimental studies, the cerebellar tonsillar herniation occurring in CMI is reported to mainly result from overcrowding of a normally developing hindbrain within a primary small and shallow PCF due to an anomaly in the embryological development of the occipital bone [1,3,4,7,9].…”

“…Tonsillar herniation measured from the McRae line to tip of the cerebellar tonsil [2,11]. The diagnosis of CMI was based on the determination of a cerebellar tonsillar herniation of at least 5 mm below the FM [3]. The skull of our case was printed using 3D printer (Z printer 450) (Fig.…”