Fibroadenoma of the breast showing a translocation (6;14), a ring chromosome and two markers involving parts of chromosome 11.

The cytogenetic findings of a recurrent fibroadenoma of a 25-year-old woman are reported. Of 58 metaphases karyotyped after G-banding, 27 showed an apparently normal karyotype and 31 the karyotype 48,XX,del(6)(q21),r(11)(?) + der(11)x2,der(14)t(6;14)(q21;q32). By fluorescence in situ hybridization studies using a chromosome 11 specific painting probe, we were able to show that the two marker chromosomes and the ring contained chromosome 11 DNA.