Autosomal ring chromosomes are rare abnormalities that are inherently unsta
ble. Children with ring chromosome 6 have a wide range of intellectual func
tioning and congenital anomalies. Cardiac lesions are rarely reported with
this chromosome abnormality. We report on a 11-year-old boy with mosaic rin
g chromosome 6 and a dilated aortic root. (C) 2001 Wiley-Liss, Inc.