To the Editor:-Pedigree or family studies of stuttering have shown increased risks among relatives, but they have not distinguished between the importance of genetic and shared environmental influences. Twin studies that are free of ascertainment bias can distinguish between these causes, but previous twin studies on clinical samples have properly not sought to distinguish. We report data from ...

We report a boy aged 12 years 7 months with mental retardation, hydrocephalus, dysmorphic facial features, congenital heart disease, and skeletal and renal anomalies. The karyotype showed a mosaic tetrasomy 9p involving the secondary constriction. This result was confirmed by tetraplex gene dosage effect for galactose-1-P-uridyltransferase (GALT). Comparing the clinical features of our case wit...

A 21-year-old man walked into the ED complaining of mild headache after colliding with another player during a baseball game. The patient denied loss of consciousness and noted numbness over his left forehead. He denied vision change, fluid from his nose or ears, dizziness or other injury. He had normal mentation, no neck pain, and an otherwise non-focal exam. He declined pain medication. A vis...