Understanding Pediatric Brain Tumors: Signs, Diagnosis, and Support for Your Child

Dear parents, does your little one complain of frequent headaches? Do they sometimes vomit in the morning, or have you recently noticed sudden changes in their behavior or speech? Hearing or seeing something like this naturally brings fear and worry to your heart. However, remember that not every headache or bout of vomiting is a sign of a serious illness.

Yet, even though they are rare, these signs can sometimes point to a condition known as a pediatric brain tumor. So, without panicking, let us talk about this in detail today in a way that is easy for you to understand.

What is a Childhood Brain Tumor?

Simply put, our brain is made of millions of tiny cells. Sometimes, these brain cells start to grow in an abnormal, uncontrolled way. When this happens, a mass or growth called a neoplasm forms inside the brain.

The main cause behind this is changes or mutations in the genes of the brain cells. These genetic changes cause healthy cells to behave abnormally and form a tumor. Brain tumors generally fall into two main categories:

• Non-cancerous (Benign) Tumors: These are not cancer cells. However, if they grow large inside the brain, they can press against important nearby structures and cause health problems.
• Cancerous (Malignant) Tumors: These are true cancers. They can grow quickly and may spread to other parts of the brain or sometimes to other areas of the body.

This condition can affect a child of any age, ranging from infancy through the teenage years and even into adulthood.

How Common Are Brain Tumors in Children?

In fact, brain tumors are among the most common types of cancer diagnosed in children. Statistics show that thousands of children face this condition every year worldwide.

While hearing that statistic might feel frightening, remember that with early detection and proper medical treatment, the chances of recovery are greatly higher today than ever before.

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What Types of Brain Tumors Can Children Get?

It may sound very complex, but children can develop several different types of brain tumors. Doctors classify these tumors based on the specific type of brain cell where they start. Here are the main groups:

• Gliomas .
• Embryonal tumors .
• Pineal tumors .
• Craniopharyngiomas .
• Germ cell tumors .
• Choroid plexus tumors .
• Schwannomas .
• Meningiomas .

Now let us look at each of these groups in simple terms.

1. Gliomas.

These are the most common types of brain tumors found in children. In fact, about half of all childhood brain tumors belong to this category. They start in special cells called glial cells. Glial cells provide support, nourishment, and protection for your brain's nerve cells, which are called neurons.

Some gliomas grow slowly and are low-grade. This others grow quickly and are high-grade and more serious. Gliomas include several sub-types:

• Astrocytoma: This starts in glial cells called astrocytes. These tumors can form in the brain or the spinal cord. Some grow slowly, while others grow rapidly.
• Oligodendroglioma: These tumors start in oligodendrocytes, which are glial cells found mostly in the outer layer of the brain.
• Neuroglial tumors: These contain both glial cells and neuronal cells. They can develop in the brain and spinal cord and often cause seizures.
• Ependymoma: These tumors start in ependymal cells, which line the fluid-filled cavities inside the brain known as ventricles.

2. Embryonal Tumors.

These tumors start from fetal or embryonic cells in the central nervous system. They are cancerous tumors and can occur at any age, though doctors see them most often in infants and young children.

Key types within this category include:

• Medulloblastoma: This is the most common type of embryonal tumor. It starts in the cerebellum, which is the part at the back of the brain responsible for coordination.
• Medulloepithelioma: This is a very rare and fast-growing tumor usually seen in infants and young children.
• Atypical Teratoid/Rhabdoid Tumor (ATRT): This is also rare and often begins in the cerebellum of very young children.
• Embryonal Tumor with Multilayered Rosettes (ETMR): This is an aggressive childhood brain cancer affecting the central nervous system.

3. Pineal Tumors.

These tumors develop in the pineal gland, which sits near the center of the brain and produces the hormone melatonin. Several tumor types can start in this gland, and they can be either benign or malignant.

Types of pineal tumors in children include:

• Pineoblastoma: This is one of the most aggressive types of embryonal tumors. It can spread quickly to the brain and spinal cord.
• Pineal Parenchymal Tumors: These are moderate-grade tumors that can sometimes remain confined to the pineal region if caught early.
• Germ Cell Tumors: These form from leftover embryonic tissue residing in the pineal region.

4. Craniopharyngiomas.

These are non-cancerous tumors that start near the pituitary gland from embryonic tissue. Craniopharyngiomas can be solid, filled with fluid in a cyst, or a mix of both. Some grow slowly. This others grow quickly.

These tumors can press on the pituitary gland, which produces hormones that control growth, blood pressure, and reproduction. They can also press on the hypothalamus, a vital brain region regulating body temperature, fluid balance, and emotions. Pressure on nearby optic nerves can also cause vision problems.

5. Germ Cell Tumors.

These are cancerous tumors that start from germ cells. During normal early development, germ cells migrate outside the brain to form the ovaries or testes. However, germ cells left behind inside the brain can sometimes turn into cancer and form germ cell tumors. These tumors can spread to the spinal cord and cerebrospinal fluid (CSF).

6. Choroid Plexus Tumors.

These tumors start in the choroid plexus, the tissue that lines the ventricles of the brain. They can be non-cancerous, such as choroid plexus papilloma, or cancerous, such as choroid plexus carcinoma. Atypical choroid plexus papillomas are moderate-grade tumors that can become cancerous if left untreated.

7. Schwannomas.

These tumors start in Schwann cells, which form the protective sheath covering nerve fibers. This type of tumor usually grows near the nerve responsible for hearing and balance. If they form near the spinal cord, they can cause weakness and sensory issues. Schwannomas are usually benign, though they can rarely be malignant.

8. Meningiomas.

These are another type of brain tumor, though they are less common in children. Meningiomas start in the layers of tissue that cover the brain and spinal cord, known as the meninges. They can press on the brain and spinal cord. Most meningiomas are non-cancerous, but they can grow large enough to threaten health.

Remember that every tumor type behaves differently. This is why symptoms and treatment plans vary greatly from one child to another.

What Causes Brain Tumors?

Scientists still do not fully understand why healthy cells begin growing out of control to form a tumor. However, experts believe several factors may play a role:

• Genetic changes occurring within a cell.
• Inheriting cancer-forming genes from parents.
• Prior exposure to radiation treatment for other cancers.

Certain childhood brain tumors share a link with inherited health conditions known as cancer syndromes. Specialists continue to study these connections closely.

Cancer syndromes linked with an increased risk include:

• Li-Fraumeni syndrome .
• Neurofibromatosis type I .
• Neurofibromatosis type II .
• Tuberous sclerosis .
• Von-Hippel Lindau disease .
• Nevus basal cell carcinoma syndrome or Gorlin syndrome .
• Cowden syndrome .
• Familial adenomatous polyposis (FAP) .
• Lynch syndrome .

What Are the Symptoms of a Brain Tumor in a Child?

The symptoms of a brain tumor depend heavily on the type of tumor, its severity, how fast it grows, and its exact location in the brain. Because of this, not every child shows the exact same signs. However, common signs to watch for include:

• Extreme sleepiness or fatigue.
• Headaches that happen often in the early morning, which may improve after the child vomits.
• An increase in head size in infants.
• Nausea and vomiting, especially when linked with headaches and without diarrhea.
• Trouble with vision, hearing, or speaking.
• Balance issues, such as stumbling or falling while walking.
• Poor coordination, making it hard to grab objects or control limbs.
• Sudden behavior changes, such as becoming unusually stubborn or easily angered.
• Weakness in an arm, leg, or one entire side of the body.
• Seizures.

How Is a Brain Tumor Diagnosed in a Child?

If a doctor suspects your child might have a brain tumor, they will recommend several diagnostic tests. These tests help confirm what is happening:

• Physical Exam: The doctor checks your child's general health, asks about symptoms, and reviews personal and family medical histories.
• Neurological Exam: This checks how well the brain works by testing mental state, balance, coordination, senses, and reflexes.
• Imaging Tests: Doctors order tests to take detailed pictures of the brain or spinal cord. Examples include Magnetic Resonance Imaging (MRI), Computed Tomography (CT) scans, or Positron Emission Technology (PET) scans. Doctors sometimes inject a special contrast dye into a blood vessel beforehand to make tumor cells show up clearly.
• Blood Tests: Serum marker tests measure specific substances linked to tumors in the bloodstream.
• Biopsy: A doctor removes a tiny tissue sample from the tumor to examine under a microscope. This confirms the exact tumor type and whether it is cancerous.
• Lumbar Puncture (Spinal Tap): A doctor inserts a special needle into the lower back to collect a small sample of cerebrospinal fluid (CSF) circulating around the brain and spinal cord, checking it for abnormal cells.

Once tests reveal abnormal cells, the medical team determines whether the tumor is non-cancerous or cancerous. They also assign a grade to describe its aggressiveness and growth speed:

• Grade 1 Tumors: Grow slowly and closely resemble normal cells.
• Grade 2 Tumors: Grow slowly and rarely spread to other areas, with cells showing mild abnormalities.
• Grade 3 or 4 Tumors: Cancerous tumors that are aggressive, grow rapidly, and are more likely to spread to other parts of the brain with clearly abnormal cells.

How Are Childhood Brain Tumors Treated?

If a brain tumor is cancerous or causes bothersome symptoms, treatment is necessary. Doctors base treatment plans on the tumor's type, location, and growth speed. Treatment options include:

• Surgery: Performed to remove all or part of the tumor, or to drain fluid causing high pressure inside the brain.
• medicines: Including chemotherapy, targeted therapy, or immunotherapy to destroy cancer cells or manage symptoms.
• Radiation Therapy: Using high-energy x-rays to destroy cancer cells.
• Rehabilitation Therapy: Helping children regain speech, balance, and other skills impacted by the tumor or treatment.

What Is the Outlook for Children with Brain Tumors?

The outlook for children with brain tumors varies widely from child to child. Several factors influence this prognosis:

• The child's age and overall health.
• The location of the tumor in the brain.
• The size of the tumor.
• The grade of the tumor.
• The specific tumor type.
• The success rate of removing the tumor through treatment.
• Whether the tumor has spread to other areas.

Large, aggressive tumors can pose serious threats to life. However, thanks to constant advances in diagnosis and treatment methods, more children are successfully recovering than ever before.

Can a Childhood Brain Tumor Return After Treatment?

Yes, a brain tumor diagnosed in childhood can return, either during childhood or later in adult life. A recurrence can mean a new, different tumor forms, or that a few remaining abnormal cells from the original tumor grow back over time.

Are There Ways to Lower the Risk of Childhood Brain Tumors?

Because scientists still do not fully understand the exact causes behind brain tumors, no proven ways to prevent them currently exist.

What Should I Ask My Doctor About My Child's Brain Tumor?

It is very important to talk with your child's medical team and ask these key questions:

• Where exactly is the brain tumor located?
• Is it pressing against surrounding parts of the brain?
• Is the tumor non-cancerous or cancerous?
• Has the tumor spread, or is it likely to spread?
• What is the grade of the tumor?
• What treatments do you recommend?
• What are the risks and side effects of these treatment options?
• How likely is it that the tumor will return after treatment?
• Does my child have an underlying cancer syndrome that could cause other health issues?

What You Should Take Away.

• Childhood brain tumors involve abnormal cell growth in the brain and can be cancerous or non-cancerous.
• Watch for signs like frequent headaches, vomiting, behavior shifts, and walking difficulties, and seek medical advice promptly.
• Diagnostic tools such as MRIs, CT scans, and biopsies help doctors identify the condition accurately.
• Treatment options include surgery, chemotherapy, and radiation therapy.
• Early detection and proper care give children the best chance of recovery. Stay calm, and lean on reliable medical guidance.