Table 3.

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

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

Values are means ± standard deviations

Linear measurements in mm and angular

measurements in degrees