Arachnoid Cyst

Arachnoid cysts are common and can affect people of all ages. These cysts are fluid-filled sacs that develop in the brain or spinal cord. In this article, we will discuss what arachnoid cysts are, their symptoms, and how they can be diagnosed through imaging techniques.

What Is an Arachnoid Cyst?

An arachnoid cyst is a sac filled with cerebrospinal fluid, the clear liquid that surrounds and cushions the brain and spinal cord. These cysts can form in different parts of the arachnoid membrane, which is one of the three protective layers that encase the brain and spinal cord.

Symptoms of Arachnoid Cysts

Arachnoid cysts can vary in size, and their symptoms can range from mild to severe. Not everyone with an arachnoid cyst will experience symptoms. Some common symptoms include:


Headaches are a frequent complaint among those with arachnoid cysts. These headaches can be caused by increased pressure within the cyst or its effect on nearby brain structures.


In some cases, arachnoid cysts can irritate the brain, leading to seizures. Seizures can manifest as unusual movements, sensations, or loss of consciousness.

Nausea and Vomiting

Increased pressure on the brain can cause nausea and vomiting, particularly in children with arachnoid cysts.

Visual Disturbances

If an arachnoid cyst puts pressure on the optic nerve, it may result in visual disturbances, such as blurriness or double vision.

Balance and Coordination Problems

Arachnoid cysts in certain areas of the brain can affect balance and coordination, leading to difficulties with walking and motor skills.

Cognitive and Behavioral Changes

In some cases, arachnoid cysts can cause changes in behavior and cognition, particularly in children. These changes may include irritability, poor concentration, and developmental delays.

Diagnosing Arachnoid Cysts Through Imaging

The most common methods include:

Magnetic Resonance Imaging (MRI)

MRI is a highly effective tool for visualizing arachnoid cysts. It uses strong magnetic fields and radio waves to create detailed images of the brain and spinal cord. MRI provides clear pictures of the cyst’s location, size, and surrounding structures.

Computed Tomography (CT) Scan

CT scans use X-rays to produce cross-sectional images of the brain or spine. While they are less detailed than MRI scans, they can still identify arachnoid cysts and their general characteristics.


In some cases, particularly for infants, ultrasound may be used to detect arachnoid cysts. A small transducer sends sound waves into the body and records the echoes to create an image.

Cerebral Angiography

Cerebral angiography involves injecting a contrast dye into blood vessels in the brain and then taking X-ray images. This can help identify any vascular abnormalities associated with the cyst.


Arachnoid cysts are a relatively common condition that can cause a range of symptoms, and they are often detected through various imaging techniques. If you or a loved one experience persistent symptoms such as headaches, seizures, or visual disturbances, it’s essential to consult with a healthcare professional. Early diagnosis and appropriate management can help alleviate symptoms and improve the quality of life for individuals with arachnoid cysts.

Disclaimer: The content of this website is provided for general informational purposes only and is not intended as, nor should it be considered a substitute for, professional medical advice. Do not use the information on this website for diagnosing or treating any medical or health condition. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider.

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