A new born presents with swelling in base at the spine in which meninges herniates through bony defect cause is?
## **Core Concept**
The question describes a congenital condition where there is a herniation of meninges through a bony defect at the base of the spine in a newborn. This condition is related to a type of spina bifida, which involves a defect in the closure of the neural tube during embryonic development.
## **Why the Correct Answer is Right**
The correct answer, **Spina Bifida Meningocele**, is right because it specifically refers to a type of spina bifida where there is a protrusion of the meninges through a defect in the vertebral column. This condition occurs due to the failure of the neural tube to close completely during embryonic development, leading to a bony defect in the spine through which the meninges can herniate.
## **Why Each Wrong Option is Incorrect**
- **Option A: Myelomeningocele** is incorrect because, although it is also a type of spina bifida, it involves the herniation of both the meninges and the spinal cord through a bony defect, not just the meninges.
- **Option B: Spina Bifida Occulta** is incorrect because it represents a milder form of spina bifida where there is a small gap in the spine but no herniation of the meninges or spinal cord.
- **Option C: Meningomyelocele** is essentially another term for **Myelomeningocele** and thus is incorrect for the same reason.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that spina bifida can be classified into different types, including spina bifida occulta, meningocele, and myelomeningocele, based on the extent of the neural tube defect and the structures involved. Meningocele, specifically, involves the herniation of meninges through a bony defect without involvement of the spinal cord.
## **Correct Answer:** D. Spina Bifida Meningocele