Meningocele: A Detailed Guide

Last Updated on May 28, 2026 by Nurseslab.in Editorial Team

Overview

Meningocele is a congenital neural tube defect in which the meninges—the membranes that surround the spinal cord—protrude through an opening in the vertebral column and form a cerebrospinal-fluid-filled sac. Unlike myelomeningocele, a simple meningocele does not contain the spinal cord itself. Because the major neural elements usually remain within the spinal canal, neurological impairment is often absent or mild. Nevertheless, the lesion requires careful imaging because nerve roots, a tethered cord, fatty tissue, or another hidden spinal abnormality may be associated with the sac.

Meningocele is among the least common forms of spina bifida. It is most often found in the lumbosacral area, but it can occur at thoracic, cervical, anterior sacral, or skull-base locations. The sac may be covered by healthy skin, a thin membrane, or abnormal skin. This covering strongly affects immediate infection and rupture risk. Prognosis after appropriate repair is usually favourable, but outcome depends on lesion location, associated abnormalities, and whether subtle neural tissue is involved.

Embryology and How the Defect Develops

Early in pregnancy, a flat plate of specialised cells folds and closes to form the neural tube. Its upper portion develops into the brain, while the rest becomes the spinal cord. Closure occurs during the first month after conception, often before pregnancy is recognised. Mesodermal tissue then forms the vertebrae and surrounding structures. If closure or formation of the posterior vertebral arches is incomplete, a gap may remain through which the meninges bulge.

The protruding sac contains cerebrospinal fluid and meningeal tissue. In an uncomplicated meningocele, the spinal cord remains normally positioned and intact. In real clinical practice, the boundary between simple meningocele and other forms of spinal dysraphism is not always obvious from appearance alone. Imaging must establish whether neural tissue, nerve roots, a lipoma, a dermal sinus, split cord, or tethering is present before treatment and prognosis are discussed.

Relevant Anatomy

The spinal cord is protected by the vertebral column and three meningeal layers: dura mater, arachnoid mater, and pia mater. Cerebrospinal fluid normally circulates in the subarachnoid space. Spinal nerve roots emerge from the cord and travel through openings between vertebrae to supply sensation, movement, bladder, bowel, and other functions. A meningocele represents an outward extension of the fluid-containing meningeal compartment through a bony defect. Symptoms depend on whether the sac communicates freely with the spinal canal and whether adjacent nerves or the cord are stretched, displaced, attached, or compressed.

Types and Locations

• Posterior spinal meningocele: A sac protrudes through the back of the spinal column, most commonly in the lumbar or sacral region.
• Open meningocele: The sac is covered only by a fragile membrane or is partly uncovered, increasing infection and cerebrospinal fluid leakage risk.
• Closed or skin-covered meningocele: Intact skin covers the lesion. Urgency is usually lower, but specialist assessment remains necessary.
• Anterior sacral meningocele: The meninges bulge forward through a sacral defect into the pelvis. It may present later with constipation, urinary symptoms, pelvic pressure, infection, or complications during pelvic procedures.
• Intrathoracic meningocele: A rare protrusion into the chest, sometimes associated with connective-tissue or neurocutaneous disorders.
• Cranial meningocele: Meninges and cerebrospinal fluid protrude through a skull defect without brain tissue. This is related to encephalocele but is anatomically distinct from spinal meningocele.
• Complex or occult dysraphic lesion: A meningocele may coexist with lipoma, tethered cord, split cord, dermal sinus, or nerve-root involvement.

How Meningocele Differs From Other Forms of Spina Bifida

• Spina bifida occulta: One or more vertebral arches are incomplete, but there is no protruding cerebrospinal-fluid sac. It is often incidental.
• Meningocele: Meninges and cerebrospinal fluid protrude, while the spinal cord is generally not within the sac.
• Myelomeningocele: The sac contains meninges plus spinal cord or neural tissue. Neurological, bladder, bowel, orthopaedic, hydrocephalus, and Chiari II complications are much more common.
• Myelocele or myeloschisis: Neural tissue is open and exposed without a complete sac, representing a severe open defect.
• Lipomyelomeningocele: Fatty tissue is attached to the cord and extends through a spinal defect, commonly producing tethering.

Causes and Risk Factors

No single cause explains every meningocele. Neural tube defects arise from an interaction between genetic susceptibility, maternal health, nutrition, medication exposure, and environmental influences during very early embryonic development.

• Inadequate folate around conception: Low folate status increases neural tube defect risk. The critical period begins before many people know they are pregnant.
• Previous affected pregnancy: Recurrence risk is higher after a neural tube defect and warrants preconception specialist advice.
• Family history: A close relative with a neural tube defect can increase susceptibility.
• Anti-seizure and other medicines: Valproate is strongly associated with neural tube defects; some other medicines may also raise risk. Treatment should be reviewed before conception, not stopped suddenly.
• Pre-existing diabetes: Poor glycaemic control around conception increases congenital anomaly risk.
• Higher maternal body mass: Obesity is associated with increased neural tube defect risk at population level.
• Hyperthermia: Prolonged high fever or intense heat exposure during early pregnancy has been associated with increased risk.
• Problems with folate metabolism or absorption: Malabsorption, bariatric surgery, certain genetic factors, and some medicines may contribute.
• Other genetic or syndromic conditions: Rare chromosomal, single-gene, or multisystem disorders may include spinal dysraphism.

Signs and Symptoms

The most visible sign is a soft, fluid-filled sac over the spine. It may be round or elongated, translucent, membrane-covered, or covered by normal or abnormal skin. A simple meningocele often causes no neurological symptoms. Symptoms suggest neural involvement, tethering, compression, rupture, infection, or an associated anomaly.

• Visible midline swelling over the back, neck, or skull.
• Thin, ulcerated, leaking, inflamed, or traumatised covering.
• Weakness, altered tone, asymmetric movement, or reduced sensation below the lesion.
• Foot deformity, hip abnormality, scoliosis, or leg-length difference.
• Difficulty passing urine, recurrent urinary infection, incontinence, constipation, or loss of bowel control.
• Back or leg pain, gait change, increasing weakness, or loss of function later in childhood.
• Headache, vomiting, enlarging head size, irritability, or downward-looking eyes if hydrocephalus is present.
• Fever, redness, discharge, reduced feeding, lethargy, or irritability suggesting infection.
• Constipation, urinary obstruction, pelvic pain, or reproductive complications in anterior sacral meningocele.

Prenatal Detection

Meningocele may be detected during routine pregnancy ultrasound, although a small or skin-covered lesion can be harder to identify than an open myelomeningocele. Ultrasound evaluates the spinal defect, sac contents, limb movement, head shape, ventricles, and other organs. Absence of the cranial findings often associated with open myelomeningocele may support a closed or less severe lesion, but fetal imaging must define anatomy carefully.

• Maternal serum alpha-fetoprotein: May be raised with an open neural tube defect but can be normal when skin covers the sac. It is a screening test, not a diagnosis.
• Targeted ultrasound: Defines the level, size, covering, sac contents, vertebral defect, and associated brain or limb findings.
• Fetal MRI: Provides additional soft-tissue detail when ultrasound is uncertain or complex dysraphism is suspected.
• Amniocentesis: May be offered for alpha-fetoprotein, acetylcholinesterase, or genetic testing after counselling. It carries procedural risk and is not required in every case.
• Genetic counselling: Reviews recurrence, family history, screening limitations, and reproductive options.
• Multidisciplinary planning: Fetal medicine, neonatology, neurosurgery, genetics, radiology, and obstetrics review likely diagnosis, delivery site, immediate care, and uncertainty.

Diagnostic Evaluation After Birth

1. Immediate lesion assessment: Determine location, size, skin coverage, membrane integrity, leakage, bleeding, contamination, and signs of infection. Do not compress or repeatedly handle the sac.
2. Complete neurological examination: Document spontaneous movement, muscle tone, power, reflexes, sensation, anal tone, and level of any deficit before surgery.
3. Head and cranial assessment: Measure head circumference and assess fontanelle, eye position, feeding, swallowing, breathing pattern, and signs of hydrocephalus or hindbrain dysfunction.
4. Orthopaedic assessment: Examine hips, feet, spine alignment, contractures, and limb symmetry.
5. Bladder and bowel assessment: Observe urine stream, retention, continence, abdominal distension, stooling, and anal reflexes.
6. Spinal ultrasound: Useful in young infants when posterior vertebral structures remain incompletely ossified, especially for cord position and occult anomalies.
7. Spinal MRI: Best defines sac contents, neural tissue, cord termination, tethering, split cord, lipoma, dermal sinus, and relationships needed for surgery.
8. Brain ultrasound or MRI: Used when hydrocephalus, Chiari malformation, or another brain anomaly is suspected.
9. Renal and bladder ultrasound: Establishes baseline urinary-tract anatomy and detects hydronephrosis or retention.
10. Urodynamic testing: Considered when bladder dysfunction, abnormal imaging, recurrent infection, or neural involvement is suspected.
11. Laboratory studies: Full blood count, cultures, inflammatory markers, renal function, coagulation, and other tests are selected according to infection, leakage, surgery, or associated illness.
12. Genetic evaluation: Recommended when multiple anomalies, dysmorphic features, family history, unusual location, or a syndromic pattern is present.

Differential Diagnosis

• Myelomeningocele or myelocele containing neural tissue.
• Lipomyelomeningocele, spinal lipoma, or tethered cord.
• Dermal sinus tract, congenital dermoid, or epidermoid cyst.
• Sacrococcygeal teratoma or another soft-tissue tumour.
• Haemangioma, lymphatic malformation, or vascular lesion.
• Encephalocele when the defect is cranial.
• Spina bifida occulta without a protruding sac.
• Anterior sacral mass such as duplication cyst, teratoma, abscess, or pelvic tumour.

Immediate Newborn Management

• Transfer the newborn to a centre with neonatal and paediatric neurosurgical expertise when the lesion is open, leaking, large, complex, or prenatally identified as high risk.
• Position the baby to avoid pressure on the sac, commonly prone or side-lying under specialist guidance.
• Cover an open or fragile lesion with a sterile, non-adherent, saline-moistened dressing and protect it from urine and stool contamination.
• Maintain temperature, blood glucose, hydration, and cardiorespiratory stability.
• Use latex-safe care because people with spina bifida have an increased risk of latex sensitisation after repeated exposure.
• Begin antibiotics when infection risk, leakage, rupture, or local protocol indicates; antibiotics do not replace surgical closure.
• Arrange timely MRI or ultrasound without unsafe pressure on the lesion.
• Support feeding and parental contact while preserving lesion safety.

Surgical Treatment

Most protruding meningoceles are repaired surgically, often shortly after birth for an open or fragile lesion. A well-covered, asymptomatic lesion may allow more deliberate planning, but delaying repair requires specialist agreement and reliable protection from trauma or infection.

• Define the anatomy: Imaging guides the surgeon regarding neural elements, nerve roots, vascular structures, tethering, and the bony opening.
• Open and inspect the sac: The surgeon distinguishes simple meninges from functional neural tissue and preserves all viable nerves.
• Return or remove non-neural sac tissue: Excess meningeal tissue is excised or repositioned as appropriate.
• Close the dura: A watertight closure reduces cerebrospinal fluid leakage and infection risk.
• Release tethering when indicated: Abnormal attachments are divided only when this can be done safely.
• Reconstruct soft tissue and skin: Larger defects may require plastic-surgical flaps to achieve durable coverage.
• Treat associated disease: Hydrocephalus, dermal sinus, infection, or complex dysraphism may need separate procedures.

Risks of Surgery

• Bleeding, infection, wound breakdown, or poor skin healing.
• Cerebrospinal fluid leak or formation of a pseudomeningocele.
• Damage to nerve roots or spinal cord, causing new weakness, sensory loss, or bladder/bowel dysfunction.
• Meningitis or deeper spinal infection.
• Postoperative tethered cord or retethering as the child grows.
• Anaesthetic and respiratory complications.
• Need for additional surgery when associated abnormalities become apparent.

Postoperative Care

• Protect the wound from pressure and contamination; positioning depends on lesion level and surgical instructions.
• Monitor temperature, wound appearance, drainage, swelling, neurological function, and urine output.
• Use prescribed pain control and antibiotics where indicated.
• Assess feeding, breathing, limb movement, sensation, and bladder emptying.
• Measure head circumference and monitor for hydrocephalus when clinically relevant.
• Begin physiotherapy or occupational therapy if movement, tone, positioning, or developmental support is needed.
• Teach caregivers wound care, safe handling, warning signs, follow-up dates, and latex precautions.

Associated Conditions and Complications

• Tethered cord syndrome: The spinal cord is abnormally fixed and becomes stretched during growth, producing pain, weakness, gait change, foot deformity, scoliosis, or bladder deterioration.
• Neurogenic bladder: Nerve dysfunction may impair storage or emptying, risking infection, reflux, and kidney damage.
• Bowel dysfunction: Constipation, soiling, or impaired control may require a structured bowel programme.
• Hydrocephalus or Chiari malformation: Much less common in simple meningocele than in myelomeningocele but should be assessed when symptoms or imaging indicate.
• Orthopaedic problems: Clubfoot, hip instability, scoliosis, contracture, or changing gait can occur when hidden neural involvement is present.
• Skin complications: Pressure injury, ulceration, wound infection, or trauma may affect the sac or surgical site.
• Meningitis: An open, leaking, or infected lesion creates a route to the central nervous system.
• Late pelvic complications: Anterior sacral meningocele can cause severe constipation, urinary symptoms, obstetric difficulty, or infection if entered during rectal or pelvic procedures.

Long-Term Follow-Up

Many children with a repaired simple meningocele need only periodic surveillance after healing. Follow-up is more intensive when MRI shows tethering, nerve involvement, urinary dysfunction, orthopaedic abnormalities, or another form of dysraphism. New symptoms can emerge during growth spurts even after a normal infancy.

• Monitor leg strength, sensation, reflexes, coordination, gait, pain, and developmental milestones.
• Ask about urinary urgency, retention, wetting after previous dryness, recurrent infection, constipation, and stool accidents.
• Examine spine alignment, feet, hips, muscle balance, and skin integrity.
• Repeat renal imaging, urodynamics, or spinal MRI only when scheduled or clinically indicated.
• Support school participation, physical activity, and age-appropriate independence.
• Plan transition from paediatric to adult neurosurgical, urological, rehabilitation, or primary care when ongoing needs exist.

Prognosis

The outlook for an isolated, completely repaired meningocele is generally excellent. Most children have normal or near-normal movement, sensation, bladder and bowel function, learning, and life expectancy. The favourable prognosis reflects the absence of spinal cord tissue from the sac. However, the word “meningocele” should not be used as a guarantee of no disability until high-quality imaging and neurological assessment exclude complex anatomy.

Outcome is less predictable when the lesion is open, infected, ruptured, associated with tethered cord, part of a syndrome, or misclassified before surgery. Early protection of the sac, precise imaging, careful microsurgical repair, and follow-up for changing function substantially improve safety.

Prevention and Future Pregnancy Planning

Not every meningocele can be prevented. Periconceptional folic acid substantially reduces neural tube defect risk, but it does not eliminate it. Because neural tube closure occurs very early, prevention should begin before conception.

• People who may become pregnant should follow local guidance for daily folic acid before conception and during early pregnancy.
• A higher prescribed dose is commonly recommended after a previous neural tube defect, with certain anti-seizure medicines, or in other high-risk situations. This must be arranged with a clinician.
• Review prescription medicines before pregnancy; never stop anti-seizure or psychiatric medication abruptly.
• Optimise diabetes control, nutrition, and chronic disease before conception.
• Discuss bariatric surgery, malabsorption, vitamin B12 status, and folate-interacting medicines with a healthcare professional.
• Avoid overheating and seek treatment for significant fever in early pregnancy.
• Attend prenatal screening and detailed fetal ultrasound at the recommended time.
• Use genetic counselling to review recurrence risk and testing options after an affected pregnancy.

Family Support and Shared Decision-Making

A prenatal diagnosis can cause intense uncertainty because imaging may not reveal every nerve attachment or long-term outcome. Counselling should distinguish a simple meningocele from myelomeningocele, explain what is known and unknown, and avoid both unrealistic reassurance and undue alarm. Families benefit from meeting the neonatal and neurosurgical team, seeing the intended place of delivery, discussing feeding and bonding, and receiving written information.

After birth, parents should be included in daily observations and taught which functions matter over time. Support may involve a specialist nurse, social worker, physiotherapist, genetic counsellor, parent organisation, or early-development service. A visible scar or differences in mobility, continence, or medical routines can affect body image and participation; age-appropriate, respectful communication supports confidence and autonomy.

Nursing Care of a Patient with Meningocele

Nursing care focuses on protecting the sac before surgery, preventing infection and injury, monitoring neurological and bladder or bowel function, supporting postoperative recovery, educating caregivers, and coordinating multidisciplinary follow-up.

Nursing Assessment

• Assess the sac location, size, colour, skin covering, leakage of cerebrospinal fluid, redness, swelling, tenderness, bleeding, or signs of rupture.
• Assess neurological status, including movement, tone, reflexes, sensation, symmetry of lower limbs, response to touch, and developmental milestones.
• Monitor head circumference, fontanelle tension, irritability, vomiting, sunset eyes, seizures, or other signs of hydrocephalus or increased intracranial pressure.
• Assess bladder and bowel function, including urine output, retention, urinary tract infection symptoms, constipation, incontinence, and need for urology evaluation.
• Monitor vital signs, temperature stability, feeding tolerance, hydration, weight, skin integrity, pain, and signs of infection.
• Review diagnostic findings such as prenatal ultrasound, MRI, spinal imaging, renal ultrasound, urodynamic studies, and neurosurgical recommendations.
• Assess caregiver understanding, emotional response, cultural needs, support system, ability to protect the sac, and readiness for preoperative and discharge teaching.

Priority Nursing Diagnoses

• Risk for infection related to exposed or fragile meningeal sac, surgery, cerebrospinal fluid leakage, or invasive procedures.
• Risk for impaired skin integrity related to sac pressure, positioning, moisture, or postoperative wound healing.
• Risk for injury related to fragile sac, reduced sensation, altered mobility, or neurological impairment.
• Risk for ineffective urinary elimination related to possible neurogenic bladder or associated spinal abnormality.
• Risk for constipation related to reduced mobility, neurological involvement, feeding changes, or postoperative effects.
• Caregiver role strain related to congenital diagnosis, surgical care needs, frequent appointments, and uncertainty about long-term outcomes.
• Deficient knowledge related to sac protection, surgery, wound care, latex precautions, neurological warning signs, and follow-up needs.

Nursing Interventions

• Protect the meningocele sac by positioning the infant prone or side-lying as ordered and avoiding pressure, friction, or trauma to the sac.
• Cover the sac with sterile, moist, non-adherent dressing as prescribed, and monitor frequently for dryness, leakage, rupture, or infection.
• Use strict hand hygiene and aseptic technique during dressing care, wound care, catheter care, and other procedures.
• Maintain temperature stability and prevent fluid loss by monitoring temperature, dressing moisture, hydration, urine output, and weight.
• Prepare the infant and family for surgical repair, including preoperative fasting, laboratory work, imaging, consent support, and explanation of postoperative expectations.
• After surgery, monitor the incision for redness, swelling, drainage, dehiscence, cerebrospinal fluid leakage, pain, fever, or delayed healing.
• Perform regular neurological checks and report decreased limb movement, new weakness, altered sensation, seizures, increasing head circumference, bulging fontanelle, vomiting, irritability, or lethargy.
• Monitor bladder and bowel patterns; support prescribed catheterization, bowel regimen, hydration, and referral to urology or rehabilitation if dysfunction is present.
• Use latex-free supplies when possible because patients with spina bifida are at increased risk of latex sensitivity.
• Coordinate multidisciplinary care with neurosurgery, neonatology or paediatrics, urology, orthopaedics, physiotherapy, occupational therapy, rehabilitation, genetics, social work, and community nursing.

Patient and Family Education

• Explain that meningocele is a type of spina bifida in which a sac containing meninges and spinal fluid protrudes through the spine, but the spinal cord usually remains in place.
• Teach caregivers not to press, rub, or place the infant directly on the sac before repair and to follow positioning instructions carefully.
• Review postoperative wound-care instructions, including keeping the area clean and dry as directed and reporting redness, swelling, drainage, fever, wound opening, or fluid leakage.
• Teach warning signs that need urgent care, including poor feeding, vomiting, fever, seizures, increasing sleepiness, increasing head size, bulging fontanelle, decreased limb movement, reduced urine output, or signs of urinary infection.
• Discuss bladder and bowel monitoring, including urine patterns, constipation prevention, catheterization teaching if prescribed, and follow-up with urology or rehabilitation.
• Explain the importance of latex precautions, routine developmental monitoring, immunizations, nutrition, skin checks, and follow-up with neurosurgery and other specialists.
• Encourage future pregnancy prevention education, including folic acid supplementation before conception and during early pregnancy according to healthcare-provider advice.

Expected Outcomes

• The sac or surgical site remains protected, clean, and free from infection or rupture.
• The infant maintains stable temperature, hydration, nutrition, urine output, and comfort.
• Neurological status remains stable with no new weakness, sensory loss, seizures, or signs of increased intracranial pressure.
• Bladder and bowel function are monitored and managed according to the individualized care plan.
• Caregivers demonstrate safe positioning, wound care, infection prevention, latex precautions, and recognition of warning signs.
• The infant and family receive timely neurosurgical, developmental, urologic, rehabilitation, and community follow-up.

Evaluation

Evaluate nursing care by reviewing sac or wound integrity, signs of infection, neurological status, head circumference, bladder and bowel function, feeding, hydration, temperature stability, pain control, skin integrity, caregiver skill, and follow-up attendance. Revise the care plan if leakage, rupture, fever, wound infection, neurological changes, hydrocephalus signs, urinary problems, constipation, skin breakdown, or caregiver difficulty occurs.

REFERENCES

1. Zada, G., Lopes, M.B.S., Mukundan, S., Laws, E. (2016). Meningoceles and Encephaloceles. In: Zada, G., Lopes, M., Mukundan Jr., S., Laws Jr., E. (eds) Atlas of Sellar and Parasellar Lesions. Springer, Cham. https://doi.org/10.1007/978-3-319-22855-6_66
2. Karsonovich T, Nethi S, Arya K. Meningocele (https://www.ncbi.nlm.nih.gov/books/NBK562174/). 2024 Oct 29. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-.
3. McComb JG. A practical clinical classification of spinal neural tube defects (https://pubmed.ncbi.nlm.nih.gov/26351218/). Childs Nerv Syst. 2015 Oct;31(10):1641-57.
4. Merck Manuals Consumer Version. Neural Tube Defects and Spina Bifida https://www.merckmanuals.com/home/children-s-health-issues/birth-defects-of-the-brain-and-spinal-cord/neural-tube-defects-and-spina-bifida?query=meningocele. Last updated 4/2025.
5. Milani HJF, Barreto EQS, Chau H. Prenatal diagnosis of closed spina bifida: multicenter case series and review of the literature (https://pubmed.ncbi.nlm.nih.gov/30001658/). J Matern Fetal Neonatal Med. 2020 Mar;33(5):736-742.
6. Yun-Hai S, Nan B, Ping-Ping G, et al. Is repair of the protruded meninges sufficient for treatment of meningocele? (https://pubmed.ncbi.nlm.nih.gov/26298824/) Childs Nerv Syst. 2015 Nov;31(11):2135-40.

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