Short stature, brachydactyly, nail dysplasia, and mental retardation: further observation of the Tonoki syndrome.

We studied a patient with microcephaly, short stature, type B brachydactyly, nail dysplasia, skeletal anomalies, and mental retardation. The mother of the propositus has brachydactyly of thumbs and a similar physiognomy without mental retardation. This appears to be another observation of the Tonoki syndrome, a distinct autosomal dominant or X-linked clinical entity.