What Are Ventricular Tumors?

Ventricular tumors are brain tumors that develop in or near the ventricles, the fluid-filled spaces inside the brain. The ventricles contain cerebrospinal fluid, also called CSF, which normally flows through the brain and around the brain and spinal cord.

Ventricular tumors may include several different tumor types, such as ependymoma, subependymoma, central neurocytoma, choroid plexus tumors, intraventricular meningioma, metastatic tumors, and other lesions near the ventricular system. Some ventricular tumors are benign and slow-growing, while others may be more aggressive. The tumor type, location, size, symptoms, and effect on CSF flow all help guide treatment planning.

De Novo Brain & Spine evaluates adult patients with suspected or confirmed ventricular tumors to help determine the appropriate next step. Evaluation may include neurological examination, brain MRI, CT imaging, review of ventricular size, assessment for hydrocephalus, biopsy, surgical consultation, pathology review, or coordination with neuro-oncology, radiation oncology, or other specialists when needed.

Common Signs and Symptoms

Ventricular tumor symptoms depend on the tumor’s size, location, growth pattern, and whether it blocks cerebrospinal fluid flow. Some ventricular tumors are found incidentally on imaging, while others cause symptoms from obstructive hydrocephalus or pressure on nearby brain structures.

Common signs and symptoms may include:

• Persistent or worsening headaches
• Headaches with nausea or vomiting
• Positional headaches, meaning headaches that change with body position
• New-onset seizures
• Dizziness, balance problems, or trouble walking
• Blurred vision, double vision, or other vision changes
• Memory problems, confusion, or difficulty concentrating
• Weakness, numbness, or tingling in the face, arm, or leg
• Trouble speaking, understanding speech, or finding words
• Drowsiness, fatigue, or decreased alertness
• Symptoms of hydrocephalus, such as worsening headache, vomiting, confusion, gait changes, or sleepiness

Seek emergency medical care or call 911 for a sudden severe headache, repeated vomiting, first-time seizure, sudden weakness, sudden speech difficulty, sudden vision loss, severe confusion, loss of consciousness, or rapid neurological decline.

What Causes This Condition?

The cause of a ventricular tumor depends on the specific tumor type. Many ventricular tumors develop without a clearly known cause. A diagnosis of a ventricular tumor does not usually mean that the patient did something to cause it.

Ventricular tumors may arise from different tissues or tumor types, including:

• Ependymal cells, which line the ventricular system, as seen in ependymoma or subependymoma
• Choroid plexus tissue, which helps produce cerebrospinal fluid, as seen in choroid plexus tumors
• Neuronal or glial cells, as seen in tumors such as central neurocytoma or other glioma-related tumors
• Meningeal tissue, as seen in intraventricular meningioma
• Cancer cells from another part of the body, in the case of metastatic tumors involving the ventricular region

The clinical concern with ventricular tumors is often related to their location. Even a slow-growing tumor can cause symptoms if it blocks CSF flow, enlarges the ventricles, or causes hydrocephalus.

How Is It Diagnosed?

Ventricular tumors cannot be diagnosed by symptoms alone. Diagnosis usually requires medical history, neurological examination, brain imaging, and sometimes tissue testing.

Common diagnostic steps may include:

• Medical history and neurological examination to evaluate headaches, seizures, strength, sensation, reflexes, vision, speech, coordination, balance, memory, and alertness
• MRI of the brain with and without contrast, often the main imaging study used to evaluate a ventricular tumor
• CT scan of the head, especially in urgent situations or when MRI is not immediately available
• Review of ventricular size to determine whether the tumor is causing hydrocephalus or blocking CSF flow
• Advanced MRI techniques, such as MRI perfusion, MR spectroscopy, functional MRI, or diffusion tensor imaging when helpful for treatment or surgical planning
• Comparison with prior imaging when available to determine whether the tumor is stable, growing, or changing
• Stereotactic or endoscopic biopsy when tissue is needed and full removal is not the safest first step
• Image-guided craniotomy or endoscopic tumor surgery when surgery is appropriate for diagnosis, tumor removal, or relief of pressure
• Neuropathology review to determine the tumor type and grade when tissue is obtained
• Molecular testing in selected cases when it may help classify the tumor or guide treatment planning
• CSF evaluation only in selected situations when clinically safe and appropriate

The goal of diagnosis is to identify the tumor type, understand how it is affecting the ventricular system, determine whether hydrocephalus is present, and plan the safest treatment approach.

Treatment Options

Ventricular tumor treatment depends on the tumor type, size, location, growth pattern, symptoms, ventricular size, hydrocephalus, imaging findings, neurological examination, surgical risk, and the patient’s overall health. Not every ventricular tumor requires immediate surgery.

Treatment options may include:

• Observation with repeat MRI scans for selected small, stable, slow-growing, or asymptomatic ventricular tumors
• Medication for symptom control, such as anti-seizure medication when seizures occur or corticosteroids in selected situations involving swelling
• Treatment of hydrocephalus when CSF flow is blocked, which may include temporary ventricular drainage, endoscopic third ventriculostomy, or shunt placement depending on the situation
• Endoscopic biopsy or endoscopic tumor removal for selected ventricular tumors that can be safely approached through the ventricular system
• Image-guided craniotomy for tumor resection when surgery is appropriate to remove tumor, obtain tissue diagnosis, relieve pressure, or restore CSF flow
• Maximal safe resection, which means removing as much tumor as safely possible while protecting nearby brain structures, blood vessels, and CSF pathways
• Radiation therapy or stereotactic radiosurgery in selected cases depending on tumor type, grade, residual tumor, recurrence, or surgical risk
• Chemotherapy, targeted therapy, or other drug therapy when recommended by oncology or neuro-oncology based on the tumor type and molecular findings
• Treatment for recurrent ventricular tumors, which may include repeat surgery, radiation therapy, systemic therapy, clinical trial discussion, or monitoring depending on the case
• Rehabilitation and supportive care to help with strength, balance, speech, cognition, seizures, headaches, or daily function when symptoms are present

Surgery may be considered when a ventricular tumor is causing symptoms, blocking cerebrospinal fluid flow, causing hydrocephalus, growing over time, creating diagnostic uncertainty, or located where removal may help relieve pressure or support the next stage of care.