A child, aged 11, with female phenotype, associating a sacrococcygeal agenesis to Bonnevie-Ullrich's syndrome, without gonadal dysgenesis, is described. The patient's caryotype is a normal female one (44 A, XX). No similar cases could be found in the literature.
This association of two syndromes of undetermined origin is probably fortuitous. A genetic study of 65 pedigrees from the literature did not reveal a mendelian type of inheritance. The possibility of external factors having occurred during embryonic life is discussed.