Volumetric analysis of the basal ganglia and lateral ventricle. Column graphs showing average volumes of the segmented regions of interest. A reduced average volume was seen in the ventral striatum of transgenic HD rats (*p<0.05). CPu caudate–putamen complex (dorsal striatum), CPu/Acb caudate–putamen complex and accumbens nucleus (ventral striatum), EP entopeduncular nucleus, GP globus pallidus, LV lateral ventricle, SN substantia nigra, HD transgenic HD rats, WT wild-type rats