Silver staining of the supernumerary chromosome in the cat-eye syndrome

A case of the Cat-eye syndrome (CES) with 47,YX, + mar is presented. Silver staining method revealed the marker chromosome to be bisatellited. This abnormal chromosome is interpreted as the product of a Robertsonian translocation between the short arm and satellites of chromosome 22 and short arm of another D-group chromosome, probably No. 13.