Urner mosaic has both type of chromosomes xx + xo, so ovary can be present

Turner syndrome, also known as monosomy X, typically affects individuals with a single X chromosome (45,X) instead of the usual two sex chromosomes (46,XX or 46,XY). However, some individuals with Turner syndrome may have mosaicism, meaning they have a mix of cell lines, such as 45,X/46,XX or 45,X/46,XY.

In cases of mosaic Turner syndrome where there are both 46,XX and 45,X cell lines, the presence of 46,XX cells can contribute to the development of more typical ovarian tissue. This can potentially lead to the presence of ovaries and, in some cases, partial ovarian function. However, the extent of ovarian development and function varies widely among individuals with mosaic Turner syndrome.

The presence of functional ovarian tissue can influence puberty and fertility. Some individuals with mosaic Turner syndrome may experience spontaneous puberty and menstruation, while others may require hormone replacement therapy. Fertility can also be affected, with some women with mosaic Turner syndrome being able to conceive naturally or with assisted reproductive technologies, though this is less common.

In summary, the presence of both XX and XO cell lines in mosaic Turner syndrome can result in the presence of ovaries and some degree of ovarian function, but the outcomes are highly variable.