Affected individuals have one X and no Y chromosome. Ovaries degenerate during fetal life. In other respects, they are anatomically female with short stature and lack of secondary sexual characteristics without treatment. Although the exact incidence of Turner's syndrome is uncertain, it has been reported to appear in about 1: 2500 births.
Turner's Syndrome, in which the chromosomes are XO, is a rare chromosomal disorder of females (1:2500) characterized by short stature and the lack of sexual development at puberty. This syndrome was first described by H.H. Turner in 1938. Other physical features may include a webbed neck, heart defects, kidney abnormalities, and/or various other malformations. Normally, females have two X chromosomes. In some cases of Turner's Syndrome, however, one X chromosome is missing from the cells (45,X); research studies suggest that approximately 50% of those with TS have just the one X and about 12% have part of a Y in addition to the one X chromosome. In other affected females, both X chromosomes may be present, but one may have genetic defects. In still other cases, some cells may have the normal pair of X chromosomes while other cells do not (45,X/46,XX mosaicism). Although the exact cause of Turner's Syndrome is not known, it is believed that the disorder may result from an error during the division (meiosis) of a parent's sex cells.
It is possible that Turner's Syndrome may not be the name that you expected. Your physician may have given you another name for this disease. Please check the synonyms listed below to find other names for this specific disorder:
45, X Syndrome 
Bonnevie-Ulrich Syndrome
Chromosome X, Monosomy X Gonadal Dysgenesis (45,X)
Gonadal Dysgenesis (XO) Monosomy X
Morgagni-Turner-Albright Syndrome Ovarian Dwarfism, Turner Type
Ovary Aplasia, Turner Type Pterygolymphangiectasia
Schereshevkii-Turner Syndrome Turner-Varny Syndrome
Like Klinefelter Syndrome, Turner Syndrome is marked by an abnormal karyotype, 45,XO. While Turner women have female external genitals, the individuals lack properly formed ovaries. Without estrogen treatment, no breast growth occurs. Other possible features of Turner Syndrome include short stature, webbing of the neck, and possible heart and kidney problems.
For support for both individuals with TS and parents:
