Colloid cyst 

Short summary

A colloid cyst is a growth typically located near the centre of the brain. These cysts are filled with fluid, almost like a water balloon.

While many people with these cysts experience no symptoms, some have symptoms like headaches, dizziness, memory issues, and sight issues.

Treatment depends on the size and symptoms, with options ranging from monitoring to surgical removal if necessary.

What is a colloid cyst? 

A colloid cyst is a rare growth in the brain that is filled with fluid. They are non-cancerous or benign. 

These cysts are typically found in the central area of the brain, in or near to the third ventricle. 

They contain a thick gel like substance. 

Though they have been diagnosed in the those of any age, they are more commonly diagnosed in those aged 30 and over. 

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What are the symptoms of a colloid cyst? 

Colloid cysts can be present without causing any symptoms at all and are more often diagnosed incidentally, when medical teams are looking for the cause of another condition.  

Symptoms can vary depending on the size of the cyst and its location. Symptoms tend to occur when the cyst causes a block to the CSF (cerebrospinal fluid) flow causing hydrocephalus, a build up of fluid on the brain. 

These symptoms could include: 

• Headaches 
• Dizziness 
• Memory issues   
• Vomiting 
• Visual disturbance 

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What causes a colloid cyst?

It is not clear why these cysts develop, but it is thought that they are present during fetal development while the baby is in the womb.  
 
It’s important to know there is nothing you could have done, or avoided doing, that would have caused you to develop a colloid cyst. 

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How is a colloid cyst treated? 

The size of your cyst and symptoms you are having can affect whether treatment is required. 

If your cyst is asymptotic, not causing any symptoms and is small in size, you may be put on active monitoring treatment (also known as ‘watch and wait’). Your diagnosis should be monitored with regular scans to keep an eye on the situation. This should be discussed and explained by your medical team. 

If your cyst has grown, is a certain size or is causing symptoms, it might mean that this needs to be removed via surgery.  

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How long can I live with a colloid cyst?

Colloid cysts tend to grow very slowly and for some will never cause an issue during their lifetime. 

When these cysts are completely removed by surgery the prognosis is very good and it is unlikely the cyst will recur. 

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