Le Turner ciwo (wani lokacin ake kira dysgenesis na gonadal) Ne a cututtukan kwayoyin halitta wanda ke shafar mata kawai. Rashin daidaituwa ya shafi ɗayan X chromosomes (kwayoyin chromosomes na jima'i). Turner ciwo yana shafar kusan 1 cikin 2 mata kuma sau da yawa ana gano cutar shekaru da yawa bayan haihuwa, lokacin samartaka. Manyan alamomin su ne gajeriyar tsayi da rashin aiki na ovaries. An ba da sunan cutar ta Turner bayan likitan Amurka wanda ya gano shi a cikin 1938, Henri Turner.

Maza suna da chromosomes 46 ciki har da chromosomes guda biyu da ake kira XY. Tsarin kwayoyin halittar mutum shine 46 XY. Mata kuma suna da chromosomes 46 ciki har da chromosomes na jima'i guda biyu da ake kira 46 XX. Tsarin kwayoyin halittar mace don haka shine 46 XX. A cikin mata masu fama da ciwo na Turner, haɗin kwayoyin halitta ya ƙunshi X chromosome guda ɗaya, don haka tsarin kwayoyin halittar mace mai ciwon Turner shine 45 X0. Ko dai waɗannan matan sun rasa X chromosome ko kuma X chromosome ya wanzu, amma suna da rashin daidaituwa da ake kira gogewa. Don haka ko da yaushe akwai rashin chromosomal.