When the posterior neural arch of a single vertebra fails to close during early development and there is no other abnormality,the condition is known as:

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Spina bifida occulta is a condition where the posterior neural arch of a single vertebra fails to close during early development. However, there are no other abnormalities present. Meningomyelocele is a more severe form of spina bifida where the spinal cord and meninges protrude through an opening in the spine. Herniated nucleus pulposus is a condition where the soft center of a spinal disc pushes through a crack in the outer layer, causing pain and discomfort. Stenosis is a narrowing of the spinal canal, which can compress the spinal cord and nerves. None of these conditions match the described scenario of a single vertebral arch failing to close without any other abnormalities.

When the Posterior Neural Arch of a Single Vertebra Fails