Extra euchromatic band in the qh region of chromosome 9

Chromosomal analysis of amniotic cell culture revealed an extra euchromatic band in the variable heterochromatin region 9q12, Cytogenetic analysis of the fetus was compared with the chromosomes of the parents, Using different cytogenetic banding techniques and fluorescence in situ hybridization with specific DNA probes, the structural rearrangements involved were considere d, The very rare variant proved to be familiar. Demonstrating the inheritan ce of a normal individual supports the interpretation of the prenatal analy sis of chromosome 9 as a variant without clinical relevance for the fetus.