Select the type of Spina Bifida that occurs when part of the spinal cord protrudes through the spine forming a nerve fluid filled sac, and usually does not result in nerve damage.

The type of Spina Bifida that involves the protrusion of a part of the spinal cord through the spine forming a fluid-filled sac is known as Meningocele. In this condition, the protective membranes (meninges) surrounding the spinal cord push out through an opening in the vertebrae, leading to a sac filled with cerebrospinal fluid. One of the defining characteristics of Meningocele is that it often does not cause nerve damage, which distinguishes it from other forms like Meningomyelocele, where the spinal cord itself is involved.

Meningocele is considered the least severe type of Spina Bifida compared to Meningomyelocele, which includes spinal cord tissue and can lead to varying degrees of neurological impairment. Spina Bifida Occulta generally does not involve any visible protrusion and affects only the bony encasement of the spinal cord without any accompanying sac. Occult Spinal Dysraphism (OSD) deals with a different spectrum of spinal anomalies that can have surface manifestations but are not classified in the same way as the primary types of Spina Bifida. Thus, Meningocele is accurately recognized for its specific characteristics in relation to spinal cord protrusion