A further case of Bardet-Biedl syndrome.

Bardet-Biedl syndrome in a 10 year old boy from Botswana is described. The patient presented with retinitis pigmentosa, polydactyly, mental retardation, obesity and hypogenitalism. The patient has a twin brother who has the same clinical signs. This is the second time this condition has been described in the African literature and the first time reported in Black twins.