Inherited chromosomal translocation in two families (t(4q-;13q+) and t(5q-; 13q+)).

Two families with reciprocal translocations, t(4q-; 13q+) and t(5q-; 13q+), are reported. Each proband carried multiple malformations resulting from the unbalanced segregation in two mothers of balanced carriers. The karyotype-phenotype relationship is discussed with reference to other previously reported cases of B/D translocation.