Why Do I Need a Neurosurgeon for Aplasia Cutis Congenita?

When you are told your baby has aplasia cutis congenita (ACC), it is usually described as a missing patch of skin on the scalp ^[1]. It is completely understandable to feel confused or alarmed if your pediatrician refers you to a neurosurgeon for what seems like a surface-level skin issue. The reason for this referral is that in some severe cases—especially when the missing skin is large, deep, or located right in the middle of the head—the “defect” (the medical term for the area of missing tissue) goes deeper than the skin ^[2][3]. A neurosurgeon is a specialist in the brain, spine, and nervous system. Their job is to ensure that the critical structures beneath the scalp, such as the skull bone, the protective lining of the brain, and major blood vessels, are safe and properly protected while your baby heals ^[4][5].

What Lies Beneath the Skin

In most cases of ACC, only the top layers of skin are missing, and the area heals on its own ^[6][7]. However, the scalp is made up of several layers. When ACC is severe, the missing tissue can extend through the muscle, the skull bone, and even the dura mater (the tough, leather-like outer membrane that protects the brain) ^[8][2]. Parents often worry about what happens to the missing skull bone. Reassuringly, the skull can often slowly grow in and harden (ossify) on its own as the child grows, though some large areas may eventually require a bone graft from a surgeon when the child is older ^[9][10].

Medical professionals use the Frieden Classification to describe different types of ACC. Most scalp ACC falls into Frieden Group 1, which can sometimes include these deep skull and dura defects ^[11]. Another category, Frieden Group 4, refers to ACC associated with underlying embryologic brain or spinal malformations (such as an encephalocele) ^[11][12]. If your baby has deep Group 1 ACC or any Group 4 markers, a neurosurgeon is needed to evaluate the anatomy and recommend the safest way to protect the brain.

Understanding the Risks

Neurosurgeons are brought onto your care team to monitor and prevent rare but serious complications that can occur when the brain’s protective layers are exposed ^[13][14]. These risks include:

• Severe Bleeding: The most significant concern with midline scalp defects (lesions located directly on the top center of the head) is their position over the superior sagittal sinus ^[15][5]. This is a massive vein that drains blood away from the brain. If this vein is exposed to the air, it can dry out, scab, and rupture, leading to life-threatening hemorrhage ^[16][15]. Please be reassured: The medical team works immediately to prevent this by covering the area with specialized, moisture-retaining ointments and dressings from the moment your baby is diagnosed, keeping the vein safe and supple ^[17][7].
• Infection: When the skin and bone are open, bacteria have a direct pathway to the brain and its surrounding fluid. This can lead to serious infections like meningitis (inflammation of the fluid and membranes surrounding the brain and spinal cord) ^[18].
• Brain Exposure or Fluid Leaks: In very severe cases, the brain tissue itself or the cerebrospinal fluid that cushions it can be exposed or leak outward, requiring urgent protective measures ^[14].

How a Neurosurgeon Helps

When you meet with the neurosurgery team, they will carefully examine your baby and guide the next steps.

Reviewing Safe Imaging

To see exactly what is happening beneath the skin, doctors will often order a cranial ultrasound or Magnetic Resonance Imaging (MRI) ^[19][3]. These are the preferred tests for babies because they do not use radiation. They allow the neurosurgeon to see the exact depth of the defect, the condition of the skull bone, and the precise location of the superior sagittal sinus ^[5]. A CT scan (which uses radiation) is typically only ordered if it is absolutely necessary to plan a surgery.

Guiding the Treatment Plan

Once the neurosurgeon understands the anatomy of your baby’s ACC, they will help decide the safest treatment route. Treatment is highly individualized based on the depth of the wound ^[20][16].

• Conservative Management: If the skull is intact or the risks of surgery outweigh the benefits, the team may recommend careful, daily wound dressings ^[17][6]. Specialized ointments and bandages keep the area moist and protected, allowing the skin to slowly heal over the defect without surgery ^[7]. This process can take weeks to months. Often, the hospital team will teach you how to perform these dressing changes so you can eventually care for your baby safely at home.
• Surgical Intervention: If the superior sagittal sinus is exposed or there is a high risk of infection, the neurosurgeon (often working alongside a plastic surgeon) may recommend immediate surgery ^[15][21]. They might use skin grafts, rotation flaps (moving nearby healthy skin over the hole), or special dermal regeneration templates to securely cover and protect the brain and blood vessels ^[10][22]. Studies show that prompt surgical coverage for these high-risk, deep lesions can significantly reduce the risk of life-threatening complications ^[15][13].

Having a neurosurgeon on your baby’s medical team does not automatically mean brain surgery is necessary. Often, their role is simply to provide expert monitoring, safe imaging, and peace of mind while your baby’s skin heals safely.