Currarino triad

Q.All are true regarding spinal abnormality except

a. The bony spur in type I diastematomyelia is completely extradural

b. neurenteric cysts are usually seen intradurally anterior to the spinal cord

c the Currarino triad consists of   partial sacral agenesis ,anorectal malformation and a presacral mass

d.  a high (often at T12) abrupt spinal cord termination in type II caudal agenesis

e. the true notochord is not affected in type II caudal agenesis

ANS .---d

In type I caudal agenesis, which affects secondary neurulation and formation of the caudal cell mass, but also primary neurulation of the distal true notochord, there is a high (often at T12) abrupt spinal cord termination with a characteristic wedge-shaped configuration and variable coccygeal to lower thoracic vertebral aplasia . In type II caudal agenesis the true notochord is not affected and only the caudal cell mass is involved.