Sex, apolipoprotein E epsilon 4 status, and hippocampal volume in mild cognitive impairment.

Background: Subjects with mild cognitive impairment (MCI) have been shown to have reduced hippocampal volumes relative to normal elderly control subjects. The presence of the apolipoprotein E epsilon4 (APOE*E4) allele has been associated with greater hippocampal atrophy in women than in men with Alzheimer disease. This relationship has not been demonstrated in MCI.