Secondary Neurulation Defects: Retained Medullary Cord

Area of Science:

• Neuroscience
• Developmental Biology
• Spinal Cord Anatomy

Background:

• Retained medullary cord (RMC) is a rare congenital anomaly.
• It arises from incomplete secondary neurulation during embryonic development.
• RMC is characterized by a distinct cord-like structure caudal to the conus medullaris.

Purpose of the Study:

• To elucidate the embryological mechanisms underlying RMC formation.
• To describe the diverse morphological presentations of RMC, including cystic variants.
• To outline current surgical strategies for RMC management, focusing on untethering.

Main Methods:

• Literature review of RMC pathogenesis and classification.
• Analysis of intraoperative findings and histological confirmation of RMC.
• Review of surgical techniques and outcomes for RMC treatment.

Main Results:

• RMC results from failed regression of the caudal neural tube.
• Histological analysis confirms neuroglial elements and ependymal lining.
• Surgical untethering via limited exposure is an effective treatment.

Conclusions:

• Understanding RMC mechanisms aids in diagnosis and classification.
• Varied RMC presentations necessitate tailored surgical approaches.
• Limited exposure untethering offers a viable treatment option for RMC.