RT Journal Article SR Electronic T1 47,XXX chromosome constitution in a male. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 62 OP 66 DO 10.1136/jmg.17.1.62 VO 17 IS 1 A1 Bigozzi, U A1 Simoni, G A1 Montali, E A1 Dalpra, L A1 Rossella, F A1 Piazzini, M A1 Borghi, A YR 1980 UL http://jmg.bmj.com/content/17/1/62.abstract AB An 18-year-old boy with a male phenotype was examined because of testicular hypoplasia. Chromosome analysis using Q- and R-banding techniques and BUdR treatment showed a 47,XXX karotype, in both lymphocytes and fibroblasts. Cytogenetic problems raised by this case are discussed in relation to data from previous published reports.