What is Astrocytoma?

Astrocytoma is a type of glioma, which is a tumor that develops from glial cells in the brain or spinal cord. Astrocytomas are associated with astrocytes, support cells that help nerve cells function. In adults, astrocytomas can behave differently depending on the tumor’s grade, location, growth pattern, and molecular features.

Many adult diffuse astrocytomas are now classified using both microscopic appearance and molecular testing. Patients may see terms such as Astrocytoma, IDH-mutant, CNS WHO grade 2, grade 3, or grade 4, as well as older terms such as diffuse astrocytoma or anaplastic astrocytoma. These details help doctors understand the tumor more precisely and plan care.

De Novo Brain & Spine evaluates adult patients with suspected or confirmed astrocytoma to help determine the appropriate next step. Evaluation may include neurological examination, brain MRI, CT imaging, biopsy, image-guided tumor resection, or coordination with neuro-oncology, radiation oncology, neurology, or other specialists when needed.

Common Signs and Symptoms

Astrocytoma symptoms depend on the tumor’s location, size, grade, growth pattern, and swelling around the tumor. Some symptoms develop slowly, while others may appear more suddenly.

Common signs and symptoms may include:

• Persistent or worsening headaches
• Headaches with nausea or vomiting
• New-onset seizures
• Weakness, numbness, or tingling in the face, arm, or leg
• Trouble speaking, understanding speech, or finding words
• Vision changes, including blurred vision, double vision, or loss of part of the visual field
• Balance problems, dizziness, or trouble walking
• Memory problems, confusion, or difficulty concentrating
• Personality changes, mood changes, or behavior changes
• Fatigue, drowsiness, or decreased alertness

Seek emergency medical care or call 911 for a first-time seizure, sudden weakness, sudden speech difficulty, severe confusion, loss of consciousness, or a rapidly worsening headache with vomiting or neurological changes.

What Causes This Condition

Most astrocytomas develop without a clearly known cause. A diagnosis of astrocytoma does not usually mean that the patient did something to cause the tumor.

Possible risk factors may include:

• Prior therapeutic radiation exposure to the head or brain
• Rare inherited tumor syndromes that can increase the risk of certain brain or nervous system tumors
• Age and tumor biology, which may influence the type of astrocytoma diagnosed

Doctors may also review molecular and genetic tumor features to classify the astrocytoma and guide treatment planning. These may include IDH mutation status, ATRX expression, TP53 mutation, MGMT promoter methylation, CDKN2A/B status, and 1p/19q testing when needed to distinguish astrocytoma from oligodendroglioma.

These molecular findings are not lifestyle causes. They are tumor features that help confirm the diagnosis, determine tumor grade, and guide treatment decisions.

How It Is Diagnosed

Astrocytoma cannot be diagnosed by symptoms alone. Diagnosis usually requires a combination of medical history, neurological examination, brain imaging, and tissue testing.

Common diagnostic steps may include:

• Medical history and neurological examination to evaluate strength, sensation, reflexes, vision, speech, coordination, balance, memory, and cognitive function
• MRI of the brain with and without contrast, often the main imaging study used to evaluate a suspected astrocytoma
• CT scan of the head, especially in urgent situations or when MRI is not immediately available
• Advanced MRI techniques, such as MRI perfusion, MR spectroscopy, functional MRI, or diffusion tensor imaging when needed for treatment or surgical planning
• Stereotactic brain biopsy when tissue is needed and tumor removal is not the safest first step
• Image-guided craniotomy and tumor resection when surgery is appropriate for diagnosis, tumor removal, or relief of pressure
• Neuropathology review to determine tumor type, tumor grade, and microscopic features
• Molecular testing, which may include IDH status, ATRX, TP53, MGMT promoter methylation, CDKN2A/B, and 1p/19q testing when appropriate

The goal of diagnosis is to confirm the tumor type, understand how the astrocytoma is affecting the brain, and determine whether observation, surgery, radiation therapy, chemotherapy, or additional specialty care may be needed.

Treatment Options

Astrocytoma treatment depends on the tumor’s grade, molecular features, size, location, symptoms, imaging findings, neurological examination, surgical risk, and the patient’s overall health. Not every astrocytoma requires immediate surgery or treatment.

Treatment options may include:

• Observation with repeat MRI scans for selected lower-grade tumors that are small, slow-growing, not causing major symptoms, or found incidentally
• Medication for symptom control, such as corticosteroids to reduce brain swelling or anti-seizure medication when seizures occur
• Stereotactic brain biopsy to obtain tissue when diagnosis is uncertain or when resection is not the safest first step
• Image-guided craniotomy for tumor resection to remove as much tumor as safely possible when surgery is appropriate
• Maximal safe resection, which means removing tumor while protecting important brain functions such as speech, movement, vision, memory, and sensation
• Functional brain mapping or awake brain mapping when the tumor is near areas that control language, movement, or other critical functions
• Radiation therapy, which may be recommended depending on tumor grade, growth pattern, symptoms, residual tumor, or recurrence
• Chemotherapy or other drug therapy, when recommended by oncology or neuro-oncology based on tumor type, grade, and molecular findings
• Rehabilitation and supportive care to help with strength, balance, speech, cognition, or daily function when symptoms are present

Surgery is considered when it may help confirm the diagnosis, remove tumor, relieve pressure on the brain, reduce symptoms, or support the next stage of treatment. The safest plan depends on the astrocytoma’s location, grade, molecular features, and relationship to important brain structures.