[Subcortical hyperintensities on magnetic resonance imaging: a comparison of normal and depressed elderly subjects]

Previous studies reported that depressed subjects had more signal hyperintensities on magnetic resonance imaging scans than control subjects, but the subjects had cerebrovascular disease risk factors. This study used subjects with a history of major depression and matched comparison subjects, screened to exclude cerebrovascular risk factors, to determine whether depressed subjects had more white matter hyperintensities and other lesions. We evaluated the prevalence and severity of MRI signal hyperintensities in 30 elderly depressed patients and 20 controls matched for age. Deep matter hyperintensities, periventricular hyperintensities and subcortical gray hyperintensities were rated on a standard 0-3 scale by two radiologists blind to clinical diagnosis. No significant differences were found between groups for the presence of subcortical gray matter, deep white matter and periventricular hyperintensities. These findings suggest that cerebrovascular disease risk factors most likely mediated the relationship between depression and hyperintensities in previous studies.