We report on the occurrence of a new syndrome of upper limb hypoplasia and Müllerian duct anomalies in a French Canadian family. Limb/acral anomalies varied in expression from postaxial polydactyly to ectrodactyly to severe upper limb hypoplasia with split hand. Genital anomalies varied in expression from only a vaginal septum to complete duplication of uterus and vagina in the female to a micropenis in one of two affected males. The syndrome appears to be inherited as an autosomal dominant trait.