Caudal regression syndrome is characterized by:
absence of vertebral column, usually below level of L1.
occurs as a result of notochordal cell apoptosis, not formed in their correct craniocaudal position.
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may be seen with:
OEIS (Omphalocele, Exstrophy, Imperforate anus, Spinal Defects)
VACTERL
Currarino Triad (Sacral agenesis, Anal atresia/ malformation, Presacral mass; Meningocele/ Teratoma)