47,X,i(Xq),Y karyotype in Klinefelter's syndrome

This is a case report of 47,X,i(Xq),Y in a 24-year-old infertile male with Klinefelter's syndrome. C staining indicated that this isochromosome X had a single small centromere. BUdR incorporation revealed the isochromosome X to be late replicating.