A guide to the pathologies that develop at different embryological stages Gastrulation Primary neurulation Split cord Spinal lipoma--premature malformation--duplicated dysjunction and mesoderm notochord migration Neurenteric
cysts--failure Dermal sinus track--late of notochord precursor dysjunction integration Gastrulation Secondary neurulation Split cord Thick filum--failure of malformation--duplicated terminal mass regression (Fig.
This group includes non-neoplastic masses of congenital origin, such as dermal inclusion cysts (dermoids and epidermoids), neurenteric
cysts, and arachnoid cysts.
No syringohydromyelia, neurenteric
cyst or meningocoele could be demonstrated.
From this developmental theory, associated visceral abnormalities can be explained, including neurenteric
fistula, as reported by Tortori-Donati et al.
3,4) In myelomeningocele and neurenteric
cyst an accompanying sacral defect is usually seen.