Hyperintense lesions on magnetic resonance images in bipolar disorder

Background: To examine the magnetic resonance (MR) images of bipolar patien ts across a wide age range for the presence of hyperintense lesions compare d to age- and gender-matched control subjects, Methods: Consecutive admissions to a mood disorders unit over a 2-year peri od were evaluated retrospectively for the presence of bipolar disorder by D SM-III-R criteria and whether they received an MR scan. Bipolar patients (n = 70, mean age = 49.9 +/- 19.7 years) were age- and gender-matched to cont rol subjects (n = 70, mean age = 53.2 +/- 18.1 years) and the MR scans were rated to assess for the presence of hyperintensites, Results: Compared to control subjects, the bipolar patients demonstrated hy perintense lesions in the subependymal region, subcortical gray nuclei, and the deep white matter. Conclusions: Hyperintense lesions in bipolar patients are found in both the subcortical white matter and gray nuclei and may play an important role in the etiology of bipolar illness. (C) 1999 Society of Biological Psychiatry .