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Table 3 Measurements of the posterior cranial fossa in patients with Chiari-like symptomatology and controls

From: Dimensions of the posterior fossa in patients symptomatic for Chiari I malformation but without cerebellar tonsillar descent

Measurements depicted in Fig. 2 Chiari-like Group (N = 22) Control Group (N = 25) P
Clivus (d+e) 32.95 ± 8.7 43.00 ± 6.6 0.00005
Supraocciput (IOP to OP) 40.50 ± 5.9 41.80 ± 6.2 0.471
Basisphenoid (d) 18.63 ± 5.3 23.64 ± 4.9 0.002
Basiocciput (e) 14.00 ± 4.3 19.36 ± 4.7 0.0003
Hindbrain (b) 47.05 ± 4.1 46.40 ± 4.4 0.609
Cerebellum (c) 47.36 ± 7.9 47.04 ± 4.8 0.863
McRae's (B to OP) 43.55 ± 4.9 42.52 ± 5.9 0.524
Twining's (DS to IOP) 84.55 ± 7.8 87.32 ± 6.6 0.194
Tentorial Angle (a) 41.27 ± 6.5 34.84 ± 7.2 0.003
  1. Values are means ± standard deviations
  2. Linear measurements in mm and angular
  3. measurements in degrees