RT Journal Article SR Electronic T1 A structural MRI study of motor conversion disorder: evidence of reduction in thalamic volume JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 227 OP 229 DO 10.1136/jnnp-2013-305012 VO 85 IS 2 A1 T R Nicholson A1 S Aybek A1 M J Kempton A1 E M Daly A1 D G Murphy A1 A S David A1 R A Kanaan YR 2014 UL http://jnnp.bmj.com/content/85/2/227.abstract AB Objective To investigate potential abnormalities in subcortical brain structures in conversion disorder (CD) compared with controls using a region of interest (ROI) approach. Methods Fourteen patients with motor CD were compared with 31 healthy controls using high-resolution MRI scans with an ROI approach focusing on the basal ganglia, thalamus and amygdala. Brain volumes were measured using Freesurfer, a validated segmentation algorithm. Results Significantly smaller left thalamic volumes were found in patients compared with controls when corrected for intracranial volume. These reductions did not vary with handedness, laterality, duration or severity of symptoms. Conclusions These differences may reflect a primary disease process in this area or be secondary effects of the disorder, for example, resulting from limb disuse. Larger, longitudinal structural imaging studies will be required to confirm the findings and explore whether they are primary or secondary to CD.