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MRI Assessment of Children With Obsessive-Compulsive Disorder or Tics Associated With Streptococcal Infection

OBJECTIVE: The authors assessed selective basal ganglia involvement in a subgroup of children with obsessive-compulsive disorder (OCD) and/or tics believed to be associated with streptococcal infection. METHOD: Using computer-assisted morphometric techniques, they analyzed the cerebral magnetic resonance images of 34 children with presumed streptococcus-associated OCD and/or tics and 82 healthy comparison children who were matched for age and sex. RESULTS: The average sizes of the caudate, putamen, and globus pallidus, but not of the thalamus or total cerebrum, were significantly greater in the group of children with streptococcus-associated OCD and/or tics than in the healthy children. The differences were similar to those found previously for subjects with Sydenham’s chorea compared with normal subjects. CONCLUSIONS: These results support the hypothesis that there is a distinct subgroup of subjects with OCD and/or tics who have enlarged basal ganglia. These findings are consistent with the hypothesis of an autoimmune response to streptococcal infection.

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