[Monosomy 4 p-- (Wolf-Hirschorn's syndrome)].

The phenotype of the 4 p-- syndrome may be clinically distinguished from the one of the 5 p-- syndrome by the presence of fusion abnormalities of the median line. In the case reported, these abnormalities concerned a cleft palate, an iris coloboma and a fistula of the sacrum, in addition to an important hypotrophy and a severe mental retardation associated with epilepsy.