Where is the most common defect seen in myelomeningocele?

In myelomeningocele, the most common defect is typically found in the lumbar region. This condition occurs when the spinal column does not close completely during fetal development, leading to a protrusion of the spinal cord and its protective covering. The lumbar area is particularly susceptible because it is often where the neural tube fails to close.

Defects in the cervical or thoracic regions are less common due to the differences in the development of the spinal cord and the vertebral column during embryogenesis. The sacral region can also be affected, but lumbar defects occur much more frequently and are associated with more significant clinical issues, including motor function impairment and challenges with bowel and bladder control. This makes lumbar myelomeningocele the most prevalent site for these spinal defects.