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Pineal gland tumor

A pineal gland tumor is a growth that forms in the pineal gland, a small structure deep in the center of the brain. The pineal gland helps control sleep by releasing a hormone called melatonin. A tumor in this area can press on nearby parts of the brain or block the flow of fluid inside the brain.

A pineal region tumor is a growth that forms in the area of the brain that includes the pineal gland and nearby structures. Pineal gland tumors are one type of pineal region tumors. These terms refer to a group of rare brain tumors that can behave very differently. Some are cancerous and grow or spread more quickly, while others grow slowly and may not spread.

Pineal gland tumors are considered brain tumors because they develop within the central nervous system. They occur more often in children and young adults than in older adults, and certain types are more common in males.

Because of the pineal gland’s location, even small tumors can cause symptoms by pressing on nearby structures. These may include headaches, vision or eye movement problems, nausea, dizziness, and difficulty with coordination and walking.

Diagnosis usually involves brain imaging and additional tests to determine the tumor type.

Treatment and outlook depend on the type of tumor and how well it responds to treatment.

Pineal gland tumors are not a single condition. They include several different tumor types that start in the pineal gland or nearby tissues. These tumors vary in how fast they grow, how they are treated and their overall outlook. Knowing the tumor type is an important part of planning care and understanding your prognosis.

Germ cell tumors

Germ cell tumors are one of the most common types of tumors found in the pineal gland, especially in children and young adults. These tumors develop from germ cells, which are cells that typically form eggs or sperm. Germinomas are the most common subtype and often respond well to treatment. Other germ cell tumors may behave differently and require more-intensive care.

Nongerminomatous germ cell tumors are less common germ cell tumors in the pineal region. These tumors tend to grow more aggressively than germinomas and may include several subtypes. Treatment often involves a combination of surgery, chemotherapy and radiation therapy, depending on the tumor type and how it behaves.

Pineal parenchymal tumors

Pineal parenchymal tumors develop from cells that make up the pineal gland itself. These tumors range from slow-growing forms, such as pineocytomas, to fast-growing, more-aggressive types, such as pineoblastomas. This also includes other tumor types including pineal parenchymal tumor of intermediate differentiation (PPTID). Treatment depends on the specific subtype and may include surgery, radiation therapy, chemotherapy or a combination of these therapies for more-aggressive tumor types.

Papillary tumor of the pineal region

A papillary tumor of the pineal region (PTPR) is a rare tumor that develops near the pineal gland but does not arise from pineal cells. These tumors behave differently from pineal parenchymal tumors and often require careful testing and review by an expert. Treatment commonly involves surgery and may include additional therapies based on how the tumor grows.

Pineal cysts versus pineal gland tumors

A pineal cyst is not the same as a pineal gland tumor and is not cancer. Pineal cysts are fluid-filled sacs that are a common finding on brain imaging. Pineal cysts rarely cause symptoms and often do not grow over time. Because of this they rarely require long-term monitoring or treatment.

Pineal gland tumors are solid growths made up of unhealthy cells and may grow or affect nearby brain structures. They may be cancerous or noncancerous. Imaging tests help tell the difference between a cyst and a tumor.

Symptoms of a pineal gland tumor often develop because of increased pressure inside the skull. This is called hydrocephalus. The type and severity of symptoms can vary depending on the tumor’s size, growth rate and exact location.

Common symptoms of a pineal gland tumor may include:

  • Headaches, often caused by increased pressure inside the skull.
  • Nausea or vomiting.
  • Vision changes, such as blurred or double vision.
  • Difficulty moving the eyes, especially trouble looking upward.
  • Balance problems or difficulty walking.
  • Fatigue or changes in alertness.
  • Sleep disturbances related to changes in melatonin release.

In children, pineal gland tumors also may cause changes in growth or early puberty if the tumor affects parts of the brain that control hormones.

When to seek care

Some symptoms linked to a pineal gland tumor can get worse over time or appear suddenly. Medical care is important when symptoms do not go away, get worse or begin to affect daily activities.

Seek medical care if any of these symptoms occur:

  • Headaches that do not improve or become more frequent.
  • Nausea or vomiting that continues.
  • New or worsening vision changes.
  • Trouble moving the eyes or looking upward.
  • Sudden changes in balance or walking.
  • Ongoing sleep changes or confusion.
  • Noticeable changes in alertness, behavior or daily functioning.

Early evaluation can help identify the cause of symptoms and guide further testing or care.

In most cases, the exact cause of a pineal gland tumor is not known. These tumors form when certain cells in or near the pineal gland begin to grow in an uncontrolled way. Why this change happens is often not clear.

Different pineal gland tumors develop from different types of cells. For example, germ cell tumors arise from germ cells, while pineal parenchymal tumors develop from cells that typically make up the pineal gland. The cell type involved affects how the tumor grows and how it is treated.

Most pineal gland tumors do not appear to be linked to any conditions passed down in families. They do not appear to be linked to clear environmental causes. Research continues to help healthcare professionals better understand why these rare tumors develop.

A risk factor is something that may increase the chance of developing a condition. For pineal region tumors, few clear risk factors have been identified. Many people who develop these tumors do not have any known risk factors.

Factors that may be linked to a higher chance of a pineal gland tumor include:

  • Age, as many of these tumors are diagnosed in children and young adults.
  • Sex, as some pineal tumor types occur more often in males.
  • Tumor type, as certain types are seen more often in specific age groups.
  • Tumors of germ cell origin, which are more common in the pineal region than in other parts of the brain.
  • Diagnosis of a known genetic syndrome, such as DICER1 syndrome, that increases the risk of pineoblastoma.

Complications from a pineal gland tumor may develop when the tumor grows, affects nearby brain structures or interferes with the flow of fluid inside the brain. Some complications may be caused by the tumor itself, while others may occur as a result of treatment.

Possible complications of a pineal gland tumor include:

  • Buildup of fluid in the brain, called hydrocephalus, which can increase pressure inside the skull.
  • Ongoing vision changes or eye movement limitations that continue after treatment if nearby pathways are affected.
  • Changes in balance or coordination that may persist over time.
  • Sleep disturbances related to changes in melatonin release.
  • Hormone-related effects, such as changes in growth or early puberty in children.
  • Long-term neurological effects, depending on tumor type and location.
  • Side effects from treatment, including surgery, radiation therapy or chemotherapy.

Not everyone with a pineal gland tumor develops complications. Early diagnosis, careful treatment planning and ongoing follow-up can help reduce the risk and manage long-term effects.

There is no known way to prevent most pineal gland tumors. These tumors usually develop for reasons that are not well understood and are not linked to lifestyle choices or environmental exposures.

Diagnosis of a pineal gland tumor often begins with a review of medical history and a physical exam. A neurological exam may be done to check vision, eye movements, balance, coordination and other nervous system functions. These findings help guide decisions about imaging and further testing.

 

Tests

Imaging tests are used to closely examine the pineal region of the brain. These tests can show whether a growth is present and help determine if it looks more like a tumor or a benign cyst.

Healthcare professional often rely on a brain MRI with contrast because it provides detailed images of the pineal region. Brain MRI scans help them plan safe treatment options. MRI provides detailed images of the brain and helps show how the growth relates to nearby structures. In some cases, a brain CT scan also may be used to look for a buildup of calcium or fluid in the brain.

Imaging findings in pineal gland tumors

Imaging tests help tell the difference between a pineal gland tumor and a benign pineal cyst. Pineal tumors are usually solid growths and may change in size or appearance over time. Pineal cysts are typically filled with fluid, have smooth borders and often remain unchanged on follow-up imaging.

On MRI scans, a pineal gland tumor often appears as a solid mass in or near the pineal gland. MRI scans also can show whether the tumor is pressing on nearby structures or blocking the flow of fluid in the brain. These details help guide diagnosis and treatment planning.

A CT scan also can detect a pineal gland tumor. CT scans are sometimes used to look for calcium buildup, bleeding or signs of fluid buildup in the brain. While MRI provides more-detailed images, CT scans can be useful in certain situations.

Additional tests may be needed to better understand the tumor type and guide treatment decisions. These may include:

  • More MRI scans of the brain and spine to look for tumor spread.
  • Blood or cerebrospinal fluid tests, sometimes called tumor marker tests, to look for substances linked to certain pineal tumors, especially germ cell tumors.
  • A biopsy to examine tumor cells under a microscope, when it can be done safely.

In some cases, treatment may begin based on imaging and other test results without a biopsy. This may happen when the test results provide enough information about the tumor to guide treatment.

Treatment for a pineal gland tumor depends on several factors, including the tumor type, size and location, and whether it has spread. Some people need more than one type of treatment.

Some pineal gland tumors grow slowly and may be monitored closely, while others require prompt treatment to stop or slow the growth of the tumor.

Surgery or other procedures

Surgery is often used for a pineal gland tumor to remove as much of the tumor as possible, relieve pressure on the brain or help confirm the tumor type. Surgery may be recommended when the tumor is causing symptoms or blocking the flow of fluid in the brain or when tissue is needed to guide treatment decisions.

Surgery also may be used to:

  • Take a tissue sample for diagnosis.
  • Treat hydrocephalus by restoring usual fluid flow.

What is a tumor resection?

Resection refers to surgery to remove part or all of a tumor. A complete resection means the entire visible tumor is removed. A partial resection means only part of the tumor can be safely removed. The extent of resection depends on the tumor’s size, location and relationship to nearby brain structures.

Can a pineal tumor be removed completely?

In some people, a pineal gland tumor can be removed completely. In other cases, complete removal is not possible because the tumor is close to important areas of the brain. When full removal cannot be done safely, surgery may still help reduce tumor size or relieve symptoms.

Success of surgery and treatment

The success of surgery and other treatments varies depending on the tumor type, how far it has spread and how it responds to therapy. It also can depend on how much of the tumor can be safely removed during surgery.

Some pineal gland tumors respond very well to treatment and can be controlled for long periods of time. Others are harder to control and may require ongoing care using a combination of surgery, radiation therapy or chemotherapy.

Recovery after pineal tumor surgery

Recovery after pineal tumor surgery varies from person to person. Some people feel better within weeks. Others need more time to recover, especially if the tumor caused symptoms before surgery.

Recovery can depend on how much of the tumor was removed, whether pressure in the brain needed to be relieved and how the brain responds after surgery. Fatigue, balance changes or vision issues may improve gradually with time.

Follow-up care often includes imaging monitoring for symptoms and rehabilitation when needed. Many people return to usual activities gradually, based on guidance from the care team.

Therapies

Radiation therapy and chemotherapy are commonly used to treat certain types of pineal gland tumors. These treatments may be used alone or combined with surgery, depending on the tumor type and how it behaves.

Radiation therapy uses high-energy beams to damage or destroy tumor cells. It is often used when a tumor cannot be fully removed with surgery or when the tumor type is known to respond well to radiation. Radiation also may be used after surgery to help control tumor growth.

Chemotherapy uses medicines that travel through the body to destroy cancer cells or slow their growth. Chemotherapy is commonly used for certain pineal gland tumors, such as some germ cell tumors and pineoblastomas. This may be given alone or with radiation therapy.

Medicines

Medicines may be used to help manage symptoms related to a pineal gland tumor or its treatment. These medicines do not treat the tumor itself but can help reduce swelling in the brain, control nausea or manage other treatment-related effects.

How long does treatment and recovery take?

The length of treatment and recovery varies from person to person. Some people may complete treatment over several months, while others need longer term care and follow-up. Recovery after surgery can take weeks to months and may include rehabilitation, depending on symptoms and treatment effects. Ongoing imaging and monitoring are often part of long-term care.

Potential future treatments

Research is ongoing to improve treatment options for pineal gland tumors. Studies are exploring ways to better tailor treatment based on tumor type and growth, as well as new ways to combine surgery, radiation therapy and chemotherapy.

Some research is focused on treatments that target specific features of tumor cells, with the goal of improving effectiveness while limiting side effects. Clinical trials may offer access to newer approaches in certain situations.

Make an appointment with your usual doctor or other healthcare professional if you or your child has any symptoms that worry you. If your health professional thinks that you or your child might have a pineal gland tumor, you may be referred to a specialist. This might be a cancer doctor, called an oncologist. You also may see a surgeon who specializes in operating on the brain, called a neurosurgeon.

Appointments can be short, and being prepared can help. Here’s some information that may help you get ready.

What you can do

When you make the appointment, ask if there’s anything you need to do in advance, such as fasting before having a specific test. Make a list of:

  • Your symptoms, including any that seem unrelated to the reason for your appointment.
  • Key personal information, including major stresses, recent life changes and family medical history.
  • All medications, vitamins or other supplements you take, including the doses.
  • Questions to ask your doctor.

Take a family member or friend along, if possible, to help you remember the information you’re given.

For pineal gland tumors, some basic questions to ask your doctor include:

  • Do I have cancer?
  • Do I need to have the cancer removed?
  • Has the cancer spread?
  • Do I need more tests?
  • What are my treatment options?
  • What are the potential risks of these treatment options?
  • Do any of the treatments cure my cancer?
  • Can I have a copy of my pathology report?
  • How much time can I take to consider my treatment options?
  • Are there brochures or other printed materials that I can take with me? What websites do you recommend?
  • What will happen if I chose not to have treatment?

Don’t hesitate to ask other questions.

What to expect from your doctor

Your doctor is likely to ask you several questions, such as:

  • When did your symptoms begin?
  • Have your symptoms been continuous or occasional?
  • How severe are your symptoms?
  • What, if anything, seems to improve your symptoms?
  • What, if anything, appears to worsen your symptoms?
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  2. Astrocytoma tumors. American Association of Neurological Surgeons. https://www.aans.org/en/Patients/Neurosurgical-Conditions-and-Treatments/Astrocytoma-Tumors. Accessed July 16, 2025.
  3. Prayson RA, et al., eds. Glial and glioneuronal tumors. In: Neuropathology. 3rd ed. Elsevier; 2023. https://www.clinicalkey.com. Accessed July 11, 2025.
  4. Huang J, et al. Pilocytic astrocytoma. Anesthesia for Oncological Surgery. Springer; 2023. oi.org/10.1007/978-3-031-50977-3_66.
  5. Ferri FF. Pilocytic astrocytoma. In: Ferri’s Clinical Advisor 2026. Elsevier; 2024. https://www.clinicalkey.com. Accessed July 16, 2025.
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  7. Mair MJ, et al. Clinical characteristics and prognostic factors of adult patients with pilocytic astrocytoma. Journal of Neuro-Oncology. 2020; doi: 10.1007/s11060-020-03513-9.
  8. Salles D, et al. Pilocytic astrocytoma: A review of general, clinical, and molecular characteristics. Journal of Child Neurology. 2020; doi: 10.1177/0883073820937225.
  9. Kim JW, et al. Comparison of the clinical features and treatment outcomes of pilocytic astrocytoma in pediatric and adult patients. Child’s Nervous System. 2023; doi:10.1007/s00381-023-05839-x.
  10. Barbato MI, et al. FDA approval summary: Dabrafenib in combination with trametinib for BRAFV600E mutation-positive low-grade glioma. Clinical Cancer Research. 2024; doi:10.1158/1078-0432.CCR-23-1503.
  11. Mikkelsen M, et al. Overview of pediatric low-grade gliomas. https://www.uptodate.com/contents/search. Accessed July 16, 2025.
  12. Pilocytic. National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/pilocytic. Accessed July 17, 2025.
  13. Astrocytoma. National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/astrocytoma. Accessed July 17, 2025.
  14. Gregory TA, et al. Adult pilocytic astrocytoma in the molecular era: A comprehensive review. CNS Oncology. 2021; doi:10.2217/cns-2020-0027.
  15. Bond KM, et al. Adult pilocytic astrocytoma: An institutional series and systematic literature review for extent of resection and recurrence. World Neurosurgery. 2018; doi:10.1016/j.wneu.2017.11.102.

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