Thalamic and hippocampal volume associated with memory functions in multiple sclerosis.

•Cognitive impairment in MS is associated with a left thalamic volume reduction.•Left thalamic volume is associated with verbal memory functioning in MS.•Right hippocampal volume predicts learning performance.•The results do not show a direct association between verbal memory and hippocampal volume in MS.•This study did not show a relationship between visuospatial memory and either thalamic or hippocampal volumes in MS.