Spina Bifida is a birth defect in which the bones of the vertebrae do not form completely around the spinal cord. It can occur anywhere along the vertebrae causing a bulge under the skin where the opening is. Spina Bifida is the most common birth defect of neural tube defects. There are two types of Spina Bifida. The mildest and most common form is called Spina Bifida Occulta. This spinal defect is hidden under the skin and doesn't usually cause problems or need treatment. Doctors estimate 10-24% of the general population unknowingly has this defect. The rare, but severe form is known as Spina Bifida Manifesta. Spina Bifida Manifesta is separated into two classes. The first is known as Meningocele. This is where Cerebral Spinal Fluid (CSF) leaks out of the spinal canal, causing a swollen area over the baby's spine. The second class is called Myelomeningocele. Here the spinal nerves push out of a segment of the spine, against the underside of the skin. Nerves are often damaged or even destroyed. In worst cases, the skin is open when born and the nerves are exposed to the outside of the body.
Doctors are not certain of the exact cause of Spina Bifida, but believe that both genetics and environmental factors are involved. Spina Bifida develops in the fetus early in pregnancy, often before a woman knows she's pregnant. In the United States, 1 out of every 2,000 children is born with Spina Bifida. Spina Bifida Manifesta is most common in babies born to women whose ancestors came from the British Isles. It is less common in those whose ancestors came from Africa. Women who have had one child with Spina Bifida are more likely to have another child with Spina Bifida also. Other causing factors include a Folic acid deficiency, excessive use of alcohol, exposure to high temperatures, having diabetes, being obese, and taking medications such as those given for epilepsy and acne.
Symptoms of Spina Bifida differ on the severity of the disorder.