Table II.

Group comparison of landmark distance to anterior commissure line

Landmark	Mean ± SD (mm)		t	P
	Controls	OCD
R Medial frontal	57.5 ± 2.8	56.3 ± 3.1	−3.0	0.003
L Medial frontal	57.3 ± 3.1	56.1 ± 3.2	−2.8	0.005
R Anterior‐lateral frontal	51.6 ± 3.3	50.1 ± 4.1	−2.3	0.020
L Anterior‐lateral frontal	49.7 ± 3.2	47.8 ± 4.0	−3.8	0.0001
R Caudate nucleus	18.2 ± 2.4	17.4 ± 2.5	−2.6	0.010
L Caudate nucleus	17.2 ± 1.8	16.5 ± 2.2	−2.4	0.015
R Anterior insula	21.4 ± 3.2	20.1 ± 3.1	−2.8	0.005
L Anterior insula	20.7 ± 2.7	19.7 ± 2.6	−2.6	0.009