Interstitial deletions in the terminal region of chromosome 6 are rare. The deletion most often occurs de novo. Mental retardation is always described. The most characteristic manifestations are microcephaly, micrognathia, hypotonia, typical facial appearance, strabismus, and congenital heart defects. Although this chromosomal syndrome does not appear to have a distinctive phenotype, epileptic seizures are uncommon in affected individuals. We report on a novel finding in a patient with the 46 XX karyotype and del(6)(q25-q26) who developed intractable epilepsy.