Partial trisomy 18 in a family with a translocation (18;21)(q21;q22).

Abstract
A family is described in which 2 sibs had similar congenital abnormalities. Chromosome investigation of the mother and another child disclosed that they were carriers of a translocation t(18;21)(q21;q22). The karyotype of one of the abnormal infants was determined and was consistent with partial trisomy 18,46,XY,-21,+der(21),t(18;21)(18pter.fwdarw.18q21::21q22.fwdarw.21qter)mat.