[Del(1)(q22-q25) syndrome. Cytogenetics and phenotype].

A male infant is described with dysmorphology of the head and face, neck, extremities and genitalia, as well as growth and mental retardation and with the de novo interstitial deletion of the proximal segment of the long arm of chromosome 1-del (1) (q22-q25). Comparison of the phenotypic characteristics of this patient with those of previously described patients with similar deletion confirms the existence of the proximal 1q deletion syndrome.