Table 4.

Lateralization Index (LI) of FA values at pons level in patients before and after surgery at different follow-ups, and in control subjects.

	Time	FA	FAz
Case 1 PRE	12 days	−0.14	−0.23
Case 1 POST1	6 months	−0.21	−0.60
Case 1 POST2	1 year	−0.22	−0.60
Case 1 POST3	3 years	−0.48	−0.69
Case 2 PRE	3 days*	−0.20	−0.35
Case 2 POST1	18 months	−0.37	−0.55
Case 2 POST2	3 years	−0.35	−0.64
Case 3 PRE	10 days	−0.25	−0.76
Case 3 POST 1	2 years	−0.24	−0.77
Case 3 POST2	3 years	−0.17	−0.60
Case 4 PRE	3 days	−0.77	−0.77
		Mean (sd)	Mean (sd)
Control subjects		−0.02 (0.05)	−0.03 (0.04)

FAz refers to FA values in the z direction. Negative values indicate lateralization toward the unaffected hemisphere for patients and toward the left hemisphere for controls. Patients differed significantly from the control group at all sessions (>2 SD).

^*The patient was imaged on a 1.5 Tesla scanner for this session only.