Congenital myelomeningocele containing two hemicords with placodes in a patient with complex split spinal cord malformation: illustrative case.

This complex case of two asymmetrical nonneurulated hemicords attached to a single MMC sac, opening on different levels of the bone spur and on the right side covered by a rudimentary hemilamina, illustrates the difficulties in classifying SCMs. Since up to 15% of MMC patients additionally have SCM, the case description underlines the role of preoperative MRI in newborns before neurosurgical MMC closure. https://thejns.org/doi/10.3171/CASE251036.