Meningomyelocele, sometimes called myelomeningocele, is the most common of the three types of spina bifida. Spina bifida is a birth defect in which the spinal cord and backbone do not close at birth. In meningomyelocele, the spinal cord sticks out of the child's back through an opening, and is protected by a sac that will be visible on the child's lower back. Symptoms include weakness and numbness, back or leg pain, numbness, and bladder or bowel incontinence. Meningomyelocele can be detected during the second trimester of pregnancy. Treatment consists of surgery to repair the defect early in life. In some cases, treatment may be required later as the child grows. This may include measures to improve bladder and bowel function such as a catheter (draining tube) or dietary restrictions and orthopedic therapy as many meningomyelocele patients need to use a wheelchair.