Mayer- Rokitansky-Kuster-Hauser (MRKH) syndrome is a variation in the prenatal development of the female genital tract. Girls and women with MRKH have an absent or short vagina and absent or incompletely developed uterus, but typically functioning ovaries. There may be associated renal or skeletal differences. Synonyms: Mullerian agenesis

Micropenis refers to a penis that is very small but otherwise developed like a typical penis, without hypospadias.

A person is said to have a “mosaic karyotype” when he or she has one kind of karyotype in some of his or her cells, and a different karyotype in other cells. An example is when a person is said to have a 45,X/46,XX karyotype; that means he or she has 46,X in some cells, and 46,XX in other cells. Mosaicism happens because sometimes cells divide incorrectly early in the life of an embryo.

A synonym for Mayer-Rokitansky-Küster-Hauser Syndrome Synonyms: Mayer-Rokitansky-Küster-Hauser

Present in all embryos in early development, in most females the Mullerian ducts develop into the uterus, fallopian tubes, and the upper part of the vagina.

Also called anti-Mullerian hormone. A hormone normally produced by the testes in the early stages of male fetal development that prevents the Mullerian ducts from developing into the fallopian tubes, uterus and upper part of the vagina.