Distinctively Different Phenotypes of Two Cases with a Rare Karyotype of 45,X/47,XYY Mosaicism: Case Report and Literature Review

The 45,X/47,XYY mosaicism is an extremely rare genetic disorder with highly phenotypic manifestations such as ovotesticular disorders of sexual development, mixed gonadal dysgenesis and Turner syndrome. Herein, we report two cases with very distinctive phenotypes despite having the same sex chromosome mosaicism of 45,X/47,XYY. It should be kept in mind that the rare type of sex chromosome mosaicism of 45,X/47,XYY may present with genital phenotypes ranging from normal female to male characteristics.