Astrocytoma: Grades, Symptoms and Treatment

What Is an Astrocytoma?

An astrocytoma is a tumor that grows from astrocytes. These star-like cells support the nerve cells of the brain and spinal cord. Astrocytomas belong to the glioma family, the most common tumors of brain tissue itself.

Some astrocytomas grow slowly for years, while others grow within months. So the exact type, the grade and the gene markers guide every treatment decision. Our overview of brain tumor treatment also covers other types.

Since 2021, the WHO system grades these tumors from 1 to 4 and adds gene tests. In particular, IDH status now separates astrocytoma from glioblastoma.

At a Glance

• What it isA glioma that grows from astrocytes, the support cells of the brain
• GradesWHO grade 1 to 4; gene tests such as IDH refine the grade
• First signsOften a first seizure; also headaches or slow changes in mood or strength
• DiagnosisMRI first, then tissue from surgery or a biopsy, with gene tests
• Main treatmentRemoval of as much tumor as is safe; then radiotherapy, chemotherapy or scans
• Follow-upRegular MRI scans for many years, more often at first

Where Are You Right Now?

First, pick the line closest to your situation. It then takes you to the matching part of this guide.

1. 01A first seizure, headaches or a change in personalitySymptoms that can point to an astrocytoma→
2. 02An MRI shows a possible gliomaThe tests that confirm the type and grade→
3. 03A report that says pilocytic astrocytomaGrade 1, common in children and young adults→
4. 04A report that says IDH-mutant, grade 2 or 3What these grades mean for your treatment→
5. 05Grade 4, or the word glioblastomaHow grade 4 astrocytoma differs from glioblastoma→
6. 06Planning surgery from abroadLength of stay, flights and care back home→

Astrocytoma Grades and Types

The WHO grade shows how fast a tumor tends to grow, from 1 (slowest) to 4 (fastest). Since 2021, gene markers also decide the grade, alongside the microscope. So the full name on your report matters, not only the number.

Pilocytic Astrocytoma (Grade 1)

Pilocytic astrocytoma grows slowly and often has a clear edge. It also often holds a fluid-filled cyst and mostly affects children and young adults. Typical sites, for example, include the cerebellum, the optic nerves and the brainstem.

If the whole tumor comes out, NCI notes that close checks often replace further treatment. Radiotherapy may follow when some tumor remains. For the back of the brain, see cerebellar tumor surgery; for children, see pediatric neurosurgery.

Astrocytoma, IDH-Mutant: Grades 2 and 3

This group mostly affects younger and middle-aged adults. Its cells carry a change in the IDH1 or IDH2 gene. Most also lose the ATRX gene.

A grade 2 tumor grows slowly but spreads into nearby brain without a sharp edge. Over the years, however, some tumors turn into a higher grade, as NCI notes.

A grade 3 tumor, in contrast, shows more active, faster-dividing cells. Treatment then starts sooner, and scans come more often.

Grade 4 Astrocytoma and Glioblastoma

An IDH-mutant astrocytoma counts as grade 4 when it shows certain signs. These include dead tissue, new blood vessels or a loss of the CDKN2A/B gene. It often affects younger adults and tends to behave less aggressively than glioblastoma.

Glioblastoma, IDH-wildtype, in contrast, has no IDH change and now counts as a separate tumor. It mostly affects older adults and also grows fast. Our guide to brain cancer and glioblastoma covers it in depth.

Astrocytoma Symptoms

Symptoms depend on where the tumor sits and how fast it grows. A slow tumor may cause no symptoms for years. Fast-growing tumors, in contrast, cause changes within weeks or months.

Questions at this stage

When to See a Doctor

Most astrocytoma symptoms develop over weeks or months, so you usually have time to book a visit. Some signs, however, call for emergency care.

These signs can mean rising pressure in the skull or bleeding. So go to the nearest hospital first, rather than waiting for a visit abroad.

How Doctors Diagnose an Astrocytoma

An MRI scan with contrast dye generally shows the tumor best. Yet only tissue under the microscope, with gene tests, confirms the exact type and grade.

First, the neurosurgeon checks your strength, reflexes, balance, vision and speech. Then, depending on the case, these tests follow:

• MRI with contrast: size, edges, swelling and nearby structures
• MR spectroscopy and perfusion: hints of a higher grade inside the tumor
• Functional MRI and tractography: speech and movement areas and their pathways
• CT scan: bleeding, calcium or a quick check in an emergency
• PET scan: later on, telling regrowth apart from radiation changes

A scan alone can mislead, however. Prof. Albayrak co-authored a 2011 report on exactly this. In it, a lung cancer metastasis looked just like a cystic astrocytoma.

Pathology and Gene Markers

Tissue comes from surgery or, when removal carries too much risk, from a needle biopsy. A neuropathologist then names the tumor and its grade. Gene tests also follow on the same tissue, as NICE recommends.

Astrocytoma Treatment by Grade

Treatment depends on the type, grade, gene markers, location, and your age and health. First, surgery removes as much tumor as is safe. Then a tumor board plans what follows.

At this board, Prof. Albayrak reviews each case with oncology, radiotherapy and neurology colleagues.

Radiotherapy

Radiotherapy aims precise beams at the tumor area and spares healthy brain as far as possible. Sessions then run on weekdays for several weeks. Modern methods include intensity-modulated radiotherapy (IMRT) and, for some tumors, proton therapy.

For low-grade tumors, doctors sometimes delay radiotherapy to protect memory and thinking. In children, they also weigh its effect on growth and development, NCI notes.

Chemotherapy and Targeted Pills

Temozolomide, taken as capsules, forms the most common chemotherapy for astrocytoma. For grade 3 astrocytoma, NICE recommends radiotherapy followed by up to 12 cycles of it. Another option, PCV, combines three drugs.

In 2024, the FDA approved vorasidenib, a daily pill, for grade 2 IDH-mutant astrocytoma after surgery. It blocks the faulty IDH enzyme and so can delay further treatment. Your oncologist then decides whether it suits you.

Astrocytoma Surgery: Maximal Safe Resection

Surgery has three aims. It provides tissue for the diagnosis and relieves pressure on the brain. It also removes as much tumor as is safe.

With gliomas, research links a more complete removal to longer survival. Protecting speech, movement and vision, however, comes first.

The usual operation, a craniotomy, opens a small window in the skull under general anesthesia. Afterward, the bone goes back in place.

Tools That Help Protect Brain Function

Prof. Albayrak uses these methods, chosen for each tumor:

• Microsurgery: work under a high-power microscope, millimeter by millimeter
• Neuronavigation: a 3D map from your MRI that guides the route, much like GPS
• Fluorescence (5-ALA): a drink before surgery that makes high-grade tumor tissue glow under blue light
• Neuromonitoring: live checks of movement and speech pathways during removal
• Awake craniotomy: you wake during mapping, so the team can test speech and movement

Awake surgery mainly suits tumors near speech areas, such as many insular gliomas. The brain itself feels no pain, and the team stays with you throughout.

His 2004 review in Acta Neurochirurgica also describes intraoperative MRI. Such scans during surgery help especially in low-grade gliomas.

When a Biopsy Comes First

Sometimes an astrocytoma lies too deep or spreads too widely for safe removal. A stereotactic biopsy then takes a small sample through a tiny hole in the skull. That sample still allows the full gene tests.

Risks of Astrocytoma Surgery

Every brain operation carries real risks. Most serious problems stay uncommon, but you should know them before you decide.

Possible problems include:

• New weakness, numbness or speech trouble, often temporary
• Seizures in the first days
• Swelling of the brain, usually eased with steroid medicine
• Bleeding in the brain
• Infection of the wound or of the brain lining
• A spinal fluid leak from the wound
• Blood clots in the legs or lungs

Your own risk depends on the tumor's size and position, and on your health. So ask which risks matter most in your case.

Recovery and Follow-Up After Astrocytoma Surgery

Recovery usually starts with one or two days in intensive care, then several days on the ward. Most people walk with help on the first day. The final plan, however, waits for the pathology and gene results.

A Typical Timeline

How Often You Need MRI Scans

NICE gives a possible schedule by grade. Your own team may then adapt it:

• Pilocytic, fully removed: a scan at 12 months, then at growing intervals for 15 years
• IDH-mutant, grade 2: at 3 months, then every 6 months for 2 years; then yearly, and later every 1-2 years
• Grade 3 or 4: every 3-6 months for 2 years, every 6-12 months to year 4, then yearly to year 10

Treatment effects, however, can look like regrowth on early scans. So advanced MRI or a PET scan sometimes helps tell them apart.

Living With an Astrocytoma

Tiredness often lasts for months, especially after radiotherapy. Physiotherapy, speech therapy and occupational therapy also help many people regain skills.

UK drivers must stop driving and tell the DVLA. After surgery for most IDH-mutant grade 2 or 3 astrocytomas, the break lasts at least a year. For grade 4 tumors, it lasts at least two years; elsewhere, ask about local rules.

Astrocytoma Prognosis: What Shapes the Outlook

No single number fits every astrocytoma. According to NCI, the outlook depends on the type, grade and gene changes. Location, leftover tumor and general health also matter.

Pilocytic astrocytoma often never returns after complete removal. IDH-mutant grade 2 tumors usually progress slowly, and many people live and work for many years. Grade 3 and 4 tumors need more intensive treatment, aiming at long-term control.

Coming to Istanbul from the US, Canada, the UK or Europe

Astrocytoma care has two parts: surgery, then often months of radiotherapy, chemotherapy or scans. So many people have surgery in Istanbul and continue further treatment at home.

How Long to Stay in Istanbul

First, add up the consultation, any new scans, the operation and the hospital stay. Then rest near the hospital until your wound check. Overall, many plans come to about two weeks in Istanbul.

When You Can Fly Home

UK aviation guidance advises waiting about 7 days after brain surgery before flying. Air left inside the skull can expand at altitude. The US CDC also warns that flying soon after surgery raises the risk of blood clots.

Treatment and Follow-Up at Home

Before you leave, ask for the discharge summary, the full pathology report and copies of all scans. Your home team may also ask for the tissue slides. They can then repeat or extend the gene tests.

Next, book your oncology visit early, because radiotherapy often starts within weeks of surgery.

For insurance and Medicare, see brain surgery in Turkey: planning from the US. For NHS rules and travel insurance, see planning from the UK. From Canada, check with your provincial health plan and private insurer before you book.

Your Astrocytoma Surgeon in Istanbul

Prof. Dr. Serdar Baki Albayrak

Neurosurgeon · Full Professor of Neurosurgery

An astrocytoma often lies next to areas for speech or movement, so the margin for error stays small. For this reason, Prof. Albayrak combines microsurgery with navigation, fluorescence and nerve monitoring.

He completed his neurosurgery training at Istanbul University in 2004. He then took clinical fellowships at the University of Helsinki and Harvard Medical School. At Harvard, he trained at Brigham and Women's Hospital.

27+Years

5,000+Operations

64Countries

33Publications

Figures from Prof. Albayrak's professional profile, September 2026. See his full publication list.

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