Spinal dysraphism: MR imaging rationale

Area of Science:

• Developmental biology
• Embryology
• Neurology

Background:

• Spinal cord development involves gastrulation, primary neurulation, and secondary neurulation.
• Defects during these embryonic stages lead to spinal dysraphisms, a group of congenital malformations.
• Spinal dysraphisms are clinically categorized as open (exposed neural tissue) or closed (skin-covered).

Purpose of the Study:

• To provide a comprehensive overview of spinal cord development and malformations.
• To classify spinal dysraphisms based on embryonic origins and clinical presentation.
• To highlight the role of imaging in diagnosing these complex disorders.

Main Methods:

• Review of embryological development stages of the spinal cord.
• Clinical classification of spinal dysraphisms into open and closed categories.
• Discussion of subtypes based on presence of subcutaneous mass and notochordal development.
• Emphasis on Magnetic Resonance Imaging (MRI) as the preferred diagnostic tool.

Main Results:

• Spinal dysraphisms result from disruptions in gastrulation, primary neurulation, or secondary neurulation.
• Open spinal dysraphisms include myelomeningocele and are associated with Chiari II malformation.
• Closed spinal dysraphisms are subdivided into those with (e.g., lipomyelocele) and without (e.g., tight filum terminale) a mass, and complex types involving notochordal defects.
• MRI is crucial for evaluating the spectrum of spinal dysraphic disorders.

Conclusions:

• Understanding embryonic development is key to comprehending spinal dysraphisms.
• Accurate classification aids in diagnosis and management of spinal cord malformations.
• Magnetic resonance imaging is essential for the comprehensive evaluation of spinal dysraphisms.