A newborn presents with a midline lumbosacral defect and a protruding sac containing meninges and nerve tissue through a vertebral defect. What is the most likely diagnosis?

1. A

   Meningocele

2. B

   Meningomyelocele

3. C

   Spina bifida occulta

4. D

   Encephalocele

Appeared in: NORCET 9 Mains - 2025

Explanation

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• Meningomyelocele is a severe form of spina bifida where the spinal canal remains open along several vertebrae in the back.
• It is characterized by a protruding sac that contains cerebrospinal fluid (CSF), meninges, and crucially, portions of the spinal cord or nerve roots.
• The presence of 'nerve tissue' in the sac is the defining feature that directly matches the clinical presentation described in the question.
• This condition is also known as myelomeningocele and is the most common type of open neural tube defect.

Why Other Options Were Wrong

• Option A: In a meningocele, the protruding sac contains only meninges and cerebrospinal fluid. It does not contain any nerve tissue or parts of the spinal cord.
• Option C: Spina bifida occulta is the mildest form and involves a hidden vertebral defect without any external protruding sac. The skin over the defect is intact.
• Option D: An encephalocele is a protrusion of brain tissue and meninges through a defect in the skull, not the vertebral column. The location is on the head (commonly occipital), not the lumbosacral region.

Related Visual

• Visual 1: Diagram - An illustration comparing the anatomy of spina bifida occulta, meningocele, and meningomyelocele to clearly show the contents of the protruding sac in each type.
• Visual 2: Clinical Photo - A photograph of a newborn in the prone position, showing a meningomyelocele sac on the lumbosacral area to help visualize the clinical presentation and appropriate positioning.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Classification of Neural Tube Defects (Spina Bifida) to guide bedside assessment, documentation, and the next nursing action.
• Immediate post-birth nursing care is critical and focuses on protecting the exposed sac from rupture and infection, which can lead to meningitis and further neurological damage.
• Infants with meningomyelocele have a very high risk of developing a latex allergy due to frequent exposure to latex-containing medical products. Therefore, all care must be provided using latex-free supplies from birth.
• These infants require lifelong multidisciplinary care for associated problems like hydrocephalus (requiring a shunt), neurogenic bladder (requiring catheterization), bowel incontinence, and mobility issues.

How to Approach the Question

• Identify the key descriptive terms in the question stem: 'newborn', 'midline lumbosacral defect', 'protruding sac', 'meninges', and 'nerve tissue'.
• Recognize that these terms describe a type of congenital neural tube defect (NTD), specifically a form of spina bifida.
• Focus on the most specific and differentiating detail provided: the contents of the sac include 'nerve tissue'.
• Systematically evaluate the options based on their definitions: Meningocele (meninges only), Meningomyelocele (meninges + nerve tissue), Spina bifida occulta (no sac), Encephalocele (skull defect).
• Directly match the description 'sac containing meninges and nerve tissue' to the definition of Meningomyelocele to select the correct answer.

Concept Tested & Keywords

• Concept Tested: Classification of Neural Tube Defects (Spina Bifida)
• Stem keywords: newborn, midline lumbosacral defect, protruding sac, meninges, nerve tissue
• Lead-in keywords: most likely diagnosis
• Clinical cues: The presence of 'nerve tissue' in the sac is the definitive clue for diagnosis.
• Negative lead-in flag: false

Question ID

QhenQ9sZDWVc5oCIpmTmtq

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