Tl. Baumgardner et al., CORPUS-CALLOSUM MORPHOLOGY IN CHILDREN WITH TOURETTE SYNDROME AND ATTENTION-DEFICIT HYPERACTIVITY DISORDER, Neurology, 47(2), 1996, pp. 477-482
The aim of this study was to investigate the morphology of the corpus
callosum (CC) in Tourette syndrome (TS) and attention deficit hyperact
ivity disorder (ADHD) to determine whether these conditions affect dis
tinct regional differences. Seventy-seven children and adolescents, ag
ed 6 to 16 years, comprised the four research groups-16 patients with
TS, 21 patients with TS plus ADHD, 13 patients with ADHD, and 27 unaff
ected control subjects. A semiautomated, computer-assisted procedure w
as used to measure the total area, five subregions, centerline length,
perimeter, and bending angle of the CC. MRI data were analyzed using
several statistical methods, primarily two-tailed analysis of variance
to test the effects of TS and ADHD status, while controlling for the
influence of age, gender, and total intracranial area (an estimate of
brain size). TS was associated with significant increases in the area
of four of five subdivisions, the total area, and the perimeter of the
CC. ADHD was associated with a significant decrease in the area of th
e rostral body. There were no interactions between TS and ADHD factors
. These findings suggest that the area of the CC is larger in children
with TS, and that this difference is independent of age, handedness,
intracranial area, and the diagnosis of ADHD. Our findings support hyp
otheses that the neurobiologic mechanisms in TS and ADHD involve front
al/subcortical circuits.