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PubMed This is a summary of 26 peer-reviewed journal articles Updated
Pediatric Neurosurgery · Congenital Dermoid Cyst

Pediatric & Congenital Dermoid Cysts

At a Glance

Congenital dermoid cysts in children are usually benign but may extend deeper, especially when they occur in the midline or have a skin pit or drainage. Specialist imaging, often MRI, may be needed before complete surgical removal.

Congenital dermoid cysts are pockets of tissue that become trapped under the skin while a baby is still developing in the womb [1]. While these lumps are almost always benign (non-cancerous), their location and the way they form mean they require a specialized approach to diagnosis and treatment [2].

Where Congenital Dermoids Form

These cysts typically appear along “fusion lines”—the places where different parts of the body join together during embryonic development [1]. Common locations include:

  • Craniofacial (Head and Face): The most common spot is near the eyebrow (periorbital) [3]. They also frequently appear on the scalp, the forehead (anterior fontanelle), or the back of the head [2][4].
  • Midline Nasal: These appear on the bridge or tip of the nose [5].
  • Spinal and Sacrococcygeal: These are found along the spine or at the very base of the back [6][7].
  • Oral Floor: Occasionally, a dermoid can form under the tongue [8].

The Role of Imaging

If your child has a lump, the first step is often an ultrasound. For simple, mobile lumps near the eyebrow or on the scalp, an ultrasound is frequently used to evaluate the lesion [9][10].

However, an ultrasound that looks benign does not reliably rule out deep extension. The treating specialist will decide if an MRI is needed, which is absolutely critical if a cyst is located in the midline (exactly in the center of the nose, head, or spine), if it doesn’t move easily under the skin, or if it is associated with skin pits, hair tufts, or drainage [4][11].

  • MRI: This is the gold standard for looking at soft tissues. It helps doctors see if the cyst extends through the bone or is touching the brain or spinal cord [12][13].
  • CT Scan: This is used selectively when detailed bone assessment is needed, but doctors balance this against pediatric radiation exposure [14][15].

Safety Note: Do not squeeze, aspirate, biopsy, or drain a suspicious lesion before deep extension has been ruled out by a specialist.

Congenital Dermal Sinus Tracts

In some cases, a dermoid cyst is connected to the surface by a congenital dermal sinus tract. This is a tiny, narrow tunnel that runs from a small pit or opening in the skin down toward the cyst [16][13].

These tracts are significant because they can act as a pathway, allowing bacteria from the skin to enter deeper spaces, including the spinal canal or the brain [17]. This can lead to serious infections such as meningitis (inflammation of the brain’s lining) or an abscess (a pocket of infection) [18][19].

When to Seek Urgent Care

If your child has a known or suspected dermoid cyst, especially one on the midline or spine, you should contact your medical team immediately if you notice:

  • Fever or Severe Headache: Especially if accompanied by a stiff neck or an unexplained “ill” appearance [17][20].
  • Neurological Changes: Sudden or progressive leg weakness, a change in how they walk (ataxia), or a loss of bowel or bladder control [6][21][22].
  • Drainage: Any liquid or pus leaking from a tiny pit or hole near the cyst [23].

Surgical Treatment

The standard treatment for a congenital dermoid is surgical removal [13]. Unlike some other types of cysts, dermoids will not go away on their own and will continue to grow slowly over time [2].

The goal of surgery is complete excision. This means the surgeon removes the entire cyst “bag” (the capsule) and any associated sinus tract [13][24]. If even a tiny piece of the capsule or tract is left behind, the cyst can regrow [25]. Because some cysts extend near delicate structures like the eyes, brain, or spinal cord, these surgeries are often performed by specialists such as pediatric neurosurgeons or pediatric plastic surgeons [26][24]. Finding and removing these cysts early aims to reduce the future infection risk, though an operation cannot always reverse neurologic problems that are already present [13].

Common questions in this guide

What is a congenital dermoid cyst in a child?
A congenital dermoid cyst is a usually benign pocket of tissue that became trapped under the skin while a baby was developing before birth. These cysts often form along places where body structures joined during development and generally do not disappear on their own.
When does a child with a dermoid cyst need an MRI?
An MRI may be needed when the cyst is in the midline, feels fixed, or is associated with a skin pit, hair tuft, or drainage. MRI shows soft tissues and can help determine whether the cyst extends through bone or is near the brain or spinal cord.
Can an ultrasound rule out a deep connection from a dermoid cyst?
No. Although ultrasound is often useful for a simple, movable lump near the eyebrow or scalp, a reassuring result does not always rule out deeper extension. A specialist may recommend MRI, while CT is used selectively when detailed information about bone is needed.
Why can a midline dermoid cyst be more concerning?
A midline cyst, especially one with a small skin opening, may be connected to deeper tissues by a narrow tunnel called a dermal sinus tract. Bacteria can travel through this tract and cause serious infections such as meningitis or an abscess.
Should I squeeze, drain, or biopsy my child's dermoid cyst?
Do not squeeze, drain, aspirate, or biopsy a suspicious dermoid cyst before a specialist has checked for deep extension. A cyst near the midline or spine may connect to important structures, so evaluation should guide any procedure.
How are congenital dermoid cysts treated, and can they come back?
The usual treatment is surgery to remove the entire cyst capsule and any connected sinus tract. If a small piece remains, the cyst can grow back, so surgery may involve pediatric specialists when the lesion is near the eyes, brain, or spinal cord.
What symptoms from a child's dermoid cyst require urgent medical attention?
Seek immediate medical advice for fever, severe headache, stiff neck, an unusually ill appearance, drainage or pus, new leg weakness, changes in walking, or loss of bowel or bladder control. These symptoms can signal infection or involvement of deeper nervous-system structures.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Is the location of my child's cyst considered 'high risk' for deep extension into the skull or spine?
  2. 2.Based on the physical exam, is there a dermal sinus tract or a small pit that might connect to the brain or spinal cord?
  3. 3.Will we need an MRI or CT scan to get a better look at the underlying structures before surgery?
  4. 4.If we are using ultrasound, is it enough to rule out any deep connections to the skull?
  5. 5.What is your plan for ensuring the entire cyst and any associated tract are removed to prevent it from coming back?
  6. 6.In your experience, what is the best timing for surgery to avoid the risk of a potential future infection?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (26)
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    Considerations in the management of congenital cranial dermoid cysts.

    Khalid S, Ruge J

    Journal of neurosurgery. Pediatrics 2017; (20(1)):30-34 doi:10.3171/2017.2.PEDS16701.

    PMID: 28430075
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    Dermoid cyst with no intracranial extension: A case report and literature review.

    Tanwir A, Malik N, Javed G, Idrees R

    Surgical neurology international 2019; (10()):25 doi:10.4103/sni.sni_246_18.

    PMID: 31123632
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    Orbital and periorbital dermoid cysts: Comparison of clinical features and management outcomes in children and adults.

    Dave TV, Gupta Rathi S, Kaliki S, Mishra D

    European journal of ophthalmology 2021; (31(5)):2631-2638 doi:10.1177/1120672120964686.

    PMID: 33198489
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    Risk of Intracranial Extension of Craniofacial Dermoid Cysts.

    Overland J, Hall C, Holmes A, Burge J

    Plastic and reconstructive surgery 2020; (145(4)):779e-787e doi:10.1097/PRS.0000000000006655.

    PMID: 32221223
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    Nasoethmoidal Dermoid Cyst With Intracranial Extension. Case Presentation and Surgical Management.

    Giugliano Villarroel C, Ortiz Araya J, Carvajal Guzmán M, Ghazal Mohamad N

    The Journal of craniofacial surgery 2025; (36(2)):458-460 doi:10.1097/SCS.0000000000010853.

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    Growth of Intramedullary Spinal Cord Dermoid Cyst from a Congenital Thoracic Dermal Sinus Tract after Negative Screening Ultrasound Imaging.

    Coulthard LG, Vonhoff CR, Badran AM, et al.

    Pediatric neurosurgery 2021; (56(1)):79-84 doi:10.1159/000512580.

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    Dermoid Cyst of the Parotid Gland: Case Report of a Rare Entity and Review of the Literature.

    Alhusain ZZ, Witczak K, Shabaik A

    The American journal of case reports 2023; (24()):e939411 doi:10.12659/AJCR.939411.

    PMID: 37077038
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    Ultrasound as a standalone tool for the management of pediatric calvarial dermoid cysts.

    Alsalek S, Christian EA, Esfahani DR

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    Imaging Findings of Pediatric Orbital Masses and Tumor Mimics.

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This page explains how congenital dermoid cysts in children are evaluated and treated for informational purposes only and does not constitute medical advice. A pediatric specialist should assess any midline lump, skin pit, drainage, or neurologic symptom.

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