Central Nervous System Neuroblastoma

Central nervous system neuroblastoma is a rare type of cancer that develops from nerve cells within the brain or spinal cord. Although neuroblastoma most commonly occurs elsewhere in the body, this specific form affects the central nervous system and primarily strikes young children.

Table of contents

• What Is Central Nervous System Neuroblastoma?
• How It Differs from Other Neuroblastomas
• Signs and Symptoms
• Diagnosis
• Treatment Approaches
• Outlook for Patients

What Is Central Nervous System Neuroblastoma?

Central nervous system neuroblastoma is a rare malignant tumor (a type of cancer that grows and can spread to other parts of the body) that develops from neural crest cells within the central nervous system^[1][2]. The central nervous system includes the brain and spinal cord.

This tumor can occur in various regions of the brain and spinal cord^[2]. The symptoms and treatment needs depend heavily on where the tumor is located and how large it has grown.

Central nervous system neuroblastoma primarily affects children. It is considered distinct from the more common form of neuroblastoma that develops outside the brain and spinal cord^[2].

How It Differs from Other Neuroblastomas

Most neuroblastomas develop outside the central nervous system. The more common form typically starts in the adrenal glands (small organs that sit on top of the kidneys) or along nerve tissue near the spine in the chest, abdomen, or neck^[1][3]. About half of all neuroblastomas begin in the adrenal glands^[3].

• Brain
• Spinal cord

Neuroblastoma develops from immature nerve cells called neuroblasts. These are cells that are found in several areas of the body during development. In typical neuroblastoma, these cells are found in the sympathetic nervous system, which helps control automatic body functions like heart rate, blood pressure, and digestion^[1][4].

When neuroblastoma forms in the central nervous system instead of in these other locations, it creates unique challenges for diagnosis and treatment. The tumor is often classified using a specific genetic marker called the FoxR2 gene^[14][15].

Signs and Symptoms

The symptoms of central nervous system neuroblastoma vary widely depending on where the tumor is located and how large it has grown^[2]. Because the tumor can develop in different parts of the brain or spinal cord, each child may experience different problems.

When a tumor grows in the brain or spinal cord, it may press on nearby structures and interfere with normal brain or nerve function. This pressure can cause a range of symptoms. The tumor may also block the normal flow of cerebrospinal fluid (the liquid that surrounds and cushions the brain and spinal cord), leading to increased pressure inside the skull.

Common symptoms can include headaches, vomiting, and changes in mental state^[14]. Children may also experience vision problems, difficulty with balance or coordination, or weakness in the arms or legs. Some children may develop seizures or have changes in their behavior or ability to think clearly.

Because these symptoms can be caused by many different conditions, it is important for a doctor to conduct a thorough evaluation. Early medical attention is crucial when a child shows concerning neurological symptoms.

Diagnosis

Diagnosing central nervous system neuroblastoma requires specialized imaging tests and tissue analysis. Doctors typically use magnetic resonance imaging (MRI) or computed tomography (CT) scans to create detailed pictures of the brain and spinal cord^[14][15]. These imaging tests help doctors see where the tumor is located, how large it is, and whether it is pressing on important brain structures.

To confirm the diagnosis, doctors usually need to examine a small sample of the tumor tissue. This procedure is called a biopsy^[14]. During a biopsy, a surgeon removes a tiny piece of the tumor so that specialists can examine it under a microscope. This examination helps determine exactly what type of tumor it is and guides treatment decisions.

Doctors also look for specific genetic markers in the tumor cells. Central nervous system neuroblastomas often show activation of a gene called FoxR2, which helps distinguish them from other types of brain tumors^[14][15]. The tumor cells may also express certain proteins such as Olig2, MAP2, SOX10, and synaptophysin^[15].

Treatment Approaches

Treatment for central nervous system neuroblastoma typically involves multiple approaches working together. The main treatment methods include surgery, chemotherapy, radiation therapy, and sometimes stem cell transplantation^[14].

Surgery is often the first step when possible. The goal is to remove as much of the tumor as safely possible without damaging critical brain or spinal cord tissue^[14]. However, the location of the tumor sometimes makes complete removal difficult or impossible.

Chemotherapy uses powerful medications to kill cancer cells or stop them from growing. For central nervous system neuroblastoma, chemotherapy may be given before surgery to shrink the tumor, after surgery to eliminate remaining cancer cells, or both^[14].

Radiation therapy uses high-energy beams to destroy cancer cells. This treatment may be recommended after surgery, particularly if the tumor could not be completely removed. One case study reported using a type of radiation therapy called craniospinal irradiation, which treats the entire brain and spinal cord, along with chemotherapy^[14].

In some cases, doctors may recommend stem cell transplantation combined with high-dose chemotherapy^[15]. This intensive treatment approach is typically reserved for more aggressive cases.

The specific treatment plan depends on many factors, including the tumor’s location, size, and genetic characteristics, as well as the child’s age and overall health. Because central nervous system neuroblastoma is so rare, treatment approaches may need aggressive therapy to prevent the cancer from spreading and to improve outcomes^[2].

Outlook for Patients

The outlook for children with central nervous system neuroblastoma varies considerably. Because this tumor type is so rare, comprehensive data about long-term survival rates are limited^[2][14].

Several factors influence the prognosis. The location of the tumor plays a significant role—tumors in certain areas of the brain may be more difficult to treat than others. The extent of surgical removal is also important; children whose tumors can be completely removed generally have better outcomes.

Most central nervous system neuroblastomas with FoxR2 activation are considered high-grade, meaning they grow quickly and are more aggressive^[15]. However, there have been rare cases of low-grade FoxR2 neuroblastomas with potentially better outcomes^[15].

One reported case of a 20-year-old woman who received surgery followed by concurrent chemotherapy and radiation therapy remained free of tumor recurrence for 14 months after completing treatment^[14]. Another case involving a 2-year-old patient showed successful tumor removal^[15].

Because central nervous system neuroblastoma is so uncommon, ongoing research is needed to better understand this disease and develop more effective treatments. The unusual presentation of these tumors demonstrates the importance of continued research into their characteristics and behavior^[15].