What is an Arachnoid Cyst?
An Arachnoid Cyst is a cyst which is located on the brain and sometimes the spine. Arachnoid Cysts are sacs filled with cerbrospinal fluid (CSF) which are found on the arachnoid membrane which covers the brain and spinal cord. They often occur near the temporal lobe and the third ventricle.
What causes an Arachnoid Cyst?
There are two types of Arachnoid Cyst; primary and secondary.
- Primary Arachnoid Cyst are present at birth and are caused by an abnormal development of the brain and spinal cord during pregnancy.
- Secondary Arachnoid Cysts are caused by head injuries or meningitis tumours.
What are the symptoms of an Arachnoid Cyst?
The symptoms of a Arachnoid Cyst include;
- Headache
- Behavioural changes
- Seizures
- Difficulties with balance and walking
- Weakness on one side of the body
If the cysts are present on the spinal cord, symptoms also include;
- Back and leg pain
- Numbness in the legs or arms
