In medicine, agenesis () refers to the failure of an organ to develop during embryonic growth and development due to the absence of primordial tissue. Many forms of agenesis are referred to by individual names, depending on the organ affected:

Agenesis of the corpus callosum - failure of the Corpus callosum to develop
Renal agenesis - failure of one or both of the kidneys to develop
Amelia - failure of the arms or legs to develop
Penile agenesis - failure of penis to develop
Müllerian agenesis - failure of the uterus and part of the vagina to develop
Agenesis of the gallbladder - failure of the Gallbladder to develop. A person may not realize they have this condition unless they undergo surgery or medical imaging, since the gallbladder is neither externally visible nor essential. Eye agenesis
Eye agenesis is a medical condition in which people are born with no eyes. Dental & oral agenesis
Anodontia, absence of all primary or permanent teeth. Aglossia, absence of the tongue. Agnathia, absence of the jaw. Wisdom tooth agenesis - most adult humans have three molars (on each upper/lower left/right side), with the third being referred to as the wisdom tooth. But many people have less than the four total. Agenesis of wisdom teeth is a normal condition that can differ widely by population, ranging from practically zero in Tasmanian Aborigines to nearly 100% in indigenous Mexicans. (See research paper with world map showing prevalence.) Ear agenesis
Ear agenesis is a medical condition in which people are born without ears.
Surgery through the vagina is successful  90% of the time. Surgical correction can be accomplished by abdominal surgery, by laparoscopic and robot-assisted laparoscopic surgery. The various treatments vary in frequency. The transvaginal approach is used 39% of the time,  transabdominal/transvesical approach is used 36% of the time, the laparoscopic/robotic approach is used to treat 15% of urogenital fistulas and a combination of transabdominal-transvaginal approach is used 3% of the time. Epidemiology
Globally, 75 percent of urogenital fistulas are obstructive labor fistulas. The average age of a woman who develops a fistula due to prolonged labor is 28 years old. The average age of a woman who develops a fistula from other causes is 42 years old. Women with a small pelvis are more likely to develop a fistula. Though rare, a fistula can form after the minimally invasive oocyte retrieval part of infertility treatment. Urogenital fistulas (vesicovaginal) caused by surgical complications occur at a frequency of 0.8 per 1000. Rectovaginal fistulas
Abnormal passage of stool through the vagina is caused by a rectovaginal fistula. Treatment is often surgical with the use of tissue grafts. The presence of bowel disease increases the risk of a rectovaginal fistula. An entero-vaginal fistula can form between the bowel and the vagina. Rectovaginal fistulae result from inflammatory bowel disease, Chrohns disease trauma, or iatrogenic injury and diversions to other organs. Episiotomies can cause the formation of a rectovaginal fistula. See also
Reproductive organs
Urinary system
Urogenital triangle
Vaginal cysts


== References ==