The 9p- deletion syndrome. A patient with a 45, XX-9, -15, +t(9/15) constitution due to maternal 3:1 meiotic disjunction.

Deletion of the short arm of chromosome 9, derived from a 3:1 meiotic segregation in the mother, carrier of a balanced 9/15 translocation, was found in a 3-year-old female. Severe psychomotor retardation with delayed speech, brachicephaly, flat occiput hypertelorism and long upper lip were the main signs in the girl.