Table 1.

Brain volumetry measurements (cm³) performed at week 0 (baseline), 21 (end of treatment) and 44 (end of follow-up) in plasma exchange [PE]-treated patients (n = 18) and controls (n = 19) (mean±SD; *p < 0.05 in week 21 versus week 0 and week 44 versus week 21 comparisons)

Volume (cm3)
Brain area	Patient group	Baseline	End of treatment	End of follow-up
Left Hippocampus	PE-treated	1.90±0.41	1.76±0.45*	1.64±0.43*
	Control	1.91±0.48	1.85±0.4*	1.76±0.39*
Right Hippocampus	PE-treated	2.04±0.41	1.98±0.41*	1.88±0.35*
	Control	2.14±0.38	2.07±0.32*	1.96±0.34*
Posterior Cingulate	PE-treated	10.60±1.34	10.22±1.58	10.60±1.48
	Control	10.38±0.80	10.39±0.80	10.23±1.06
Total Intracranial volume	PE-treated	1034±100	990±83*	985±86*
	Control	1064±130	1043±120	1027±148*