new article 2004 edit
The text has been inserted into the new swyer article. See below for old text. If anyone feels that I have removed pearls without replacement please let me know. Alteripse 20:24, 19 Sep 2004 (UTC) ... I am considering a rewrite here but need to stop for tonight. Is the above a clearer explanation of a confusing disease? I will add some more on the genetic defects and on the differences between this and complete androgen insensitivity syndrome. Alteripse 01:56, 16 Sep 2004 (UTC)
- I think it's much clearer. Boy I'm glad you're around :-) Thanks! --Diberri | Talk 03:53, Sep 16, 2004 (UTC)
the old swyer syndrome article edit
Swyer syndrome, or XY gonadal dysgenesis, is a type of gonadal dysgenesis marked by the inability of a genetic male to develop testes. Individuals with this syndrome develop the normal primary sexual characteristics of females, including a uterus and vagina, but the ovaries remain as undeveloped "streak gonads". The condition is not apparent at birth, as individuals with the condition appear as normal females; symptoms most commonly appear during puberty when the absence of breast enlargement and menstruation raise suspicions of a potential developmental disorder.
Overview edit
Sexual development is governed in part by genes located on the X and Y chromosomes. In normal XY individuals, these genes cause the fetus to develop the sexual organs of males rather than those of females. But in XY individuals with Swyer syndrome, there is an abnormality in one or more of these genes that prevents normal masculine development, favoring female sexual development instead. Thus these individuals develop all the female primary sexual characteristics except for the ovaries, which are instead composed of fibrous connective tissue, and are unable to produce hormones such as estrogen.
Symptoms edit
As individuals with Swyer syndrome have normal female genitalia at birth, including a vagina and clitoris, symptoms of the syndrome typically appear in late childhood, when the effects of puberty are minimal or absent altogether. Characteristic symptoms include:
- small breast size
- absence of menstruation (amenorrhea)
- lack of underarm and pubic hair
Some individuals with Swyer syndrome also have a slightly enlarged clitoris.
Diagnosis edit
In females with delayed puberty, a pelvic ultrasound can be performed to confirm the presence or absence of ovaries.
Additionally, blood can be taken for a karyogram, which identifies the full set of chromosomes of the female. Females with Swyer syndrome will have both X and Y chromosomes rather than a set of two X chromosomes, which is normal for females.
Treatment edit
Symptoms of Swyer syndrome can be treated with hormone replacement therapy (HRT), although surgical procedures are not uncommon. A typical HRT regimen includes estrogen and progesterone treatment to regulate menstruation and induce the female's secondary sexual characteristics. In some cases, the fibrous streak gonads are surgically removed as a precautionary measure against the development of gonadoblastomas, a type of cancer of the gonads.
Prognosis edit
Pregnancy edit
In the absence of ovaries, ovulation is impossible, and so natural pregnancy is likewise impossible. Pregnancy via implantation of a fertilized ovum is a viable alternative, however, as the uterus and endometrium are intact and sufficient for bringing a pregnancy to term.
END OF OLD VERSION