Juvenile onset narcolepsy in an individual with Turner syndrome. A case report.

We describe an 8 year old girl who presented with excessive daytime sleepiness and frequent falling. Following extensive investigations, the diagnosis of both narcolepsy and Turner Syndrome were confirmed. To our knowledge, this is the first report of these two conditions in the same individual. Both conditions are common, but the early expression of narcolepsy is unusual. Although there is a genetic basis for each, the two conditions are not necessarily related since Turner is an X-linked abnormality, while narcolepsy has an autosomal basis. Nonetheless we wonder if the hormonal balance of Turner Syndrome might have some role to play in the early expression of narcolepsy.