RT Journal Article SR Electronic T1 Neurological and neuropathological findings in ring chromosome 4. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 487 OP 490 DO 10.1136/jmg.17.6.487 VO 17 IS 6 A1 Young, R S A1 Zalneraitis, E L YR 1980 UL http://jmg.bmj.com/content/17/6/487.abstract AB Despite the fact that mental retardation, microcephaly, seizures, and hyperactivity are common in patients with ring chromosome 4, little has been written about the underlying neuropathology. We describe a 6-year-old girl whose neuropathological findings included low brain weight, abnormal gyral development, and heterotopic neurons. The significance of these findings in regard to other retardation syndromes is discussed.