A patient with features of both Bardet-Biedl and Alström syndromes

We describe a 30-year-old patient with acanthosis nigricans, diabetes mellitus with insulin resistance, hypogonadotropic hypogonadism, pigmentary degeneration of the retina and cerebellar, pyramidal and posteri-or columnar involvement. He had normal mental function, normal hearing and no hexadactyly. The patient had symptoms of both Bardet-Biedl and Alström syndromes, but did not manifest all the main features of either syndrome. This suggests either that the Bardet-Biedl, Alström, Laurence-Moon syndromes (including the variant described by Edwards) have a highly variable expression or that our case is a new variant within this group of syndromes.