FOCAL GREY-MATTER HETEROTOPIAS IN MONOZYGOTIC TWINS WITH DEVELOPMENTAL LANGUAGE DISORDER

We describe 9-year-old monozygotic male twins with a developmental lan guage disorder of the phonologic-syntactic type and learning difficult ies. High-resolution MRI revealed bilateral parieto-temporal grey matt er heterotopias in both twins, on the left more than on the right, and more pronounced in the more affected twin. This suggests a causal rel ationship between the heterotopias and the neuropsychological findings in this twin pair. Conclusion Neuronal migration defects and ensuing fg cal heterotopias may be causally related to developmental language disorders.