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Dr.tiwari, Doctor
Category: Medical
Satisfied Customers: 5256
Experience:  M.D.
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What are considered large sizes for arachnoid cysts

Customer Question

Should they be removed past a certain size. Does the location matter? Does the Valsalva Maneuver terribly increase the size or perhaps cause it to burst?
Submitted: 8 years ago.
Category: Medical
Expert:  Dr.tiwari replied 8 years ago.
Small arachnoid cyst does not cause any health risk but large cyst due to compression on vital structure of brain.
Location does matter as cyst at different part may cause different symptoms like cyst at middle cranial fossa may cause auditory hallucination,at frontal region may cause depression,at left temporal lobe may cause MDP.
valsalva maneuver does increase the pressure in spinal fluid & there are few cases in literature with rupture of arachnoid cyst with valsalva maneuver.
Hope this will help you.
Customer: replied 8 years ago.
I would really like to know what is considered large or dangerous. Mine is located at the posterior center lower area of the brain
Expert:  Dr.tiwari replied 8 years ago.
Generally a cyst which is near or above the 2.5 -3 cm is considered large ,Dangerous one is that which compress the brain or spine structures to cause the symptoms.
    You are having cyst in posterior part of the brain .At this location a large cyst which is compressing on the structure may cause symptoms like nausea,loss of balance,variation in appetite,vomiting or seizures.If it is causing symptom & size is large then you should consult to your neurosurgeon ,he may treat it by fenestration or by putting shunt which will drain away the fluid inside the cyst.
Hope this will be helpful.