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Novel imaging technique shows abnormal brain anatomy in children with ADHD

CHICAGO Children with attention deficit hyperactivity disorder (ADHD) display anatomical brain abnormalities beyond chemical imbalance, according to research presented at the annual meeting of the Radiological Society of North America (RSNA). Stimulant medications prescribed to balance brain chemistry appear to normalize some of these brain irregularities, a second study reported.

"We found abnormality of the fiber pathways in the frontal cortex, basal ganglia, brain stem and cerebellum," said lead author of both studies, Manzar Ashtari, PhD., associate professor of radiology and psychiatry at North Shore-Long Island Jewish Health System in New Hyde Park, N.Y.

"These areas are involved in the processes that regulate attention, impulsive behavior, motor activity, and inhibition--the key symptoms in ADHD children," Dr. Ashtari said. "They are also known to be part of a bigger circuit in the brain that establishes communication between the frontal lobe and cerebellum."

According to the National Institute of Mental Health (NIMH), ADHD affects 3 to 5 percent of children in the United States. Children with ADHD have difficulty controlling their behavior or focusing their attention.

Using diffusion tensor imaging (DTI) to compare 18 children with diagnosed ADHD with 15 control children to evaluate the brain's white-matter fiber development, Dr. Ashtari's team found differences in the brain fiber pathways that transmit and receive information among brain areas.

"Typically ADHD is described as a chemical imbalance, but our research has shown that there may also be subtle anatomical differences in areas of the brain that are important in this disorder," said co-principal investigator Sanjiv Kumra, M.D., a psychiatrist at the Zucker Hillside Hospital in Glen Oaks, N.Y.

In the second study, the researchers found that children who had received stimulant treatment for ADHD had fewer white matter abnormalities than children who
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Contact: Maureen Morley
mmorley@rsna.org
630-590-7762
Radiological Society of North America
29-Nov-2004


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