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* They occur mainly in the ventricles.
 
* They occur mainly in the ventricles.
 
** The lateral ventricle is most often affected.
 
** The lateral ventricle is most often affected.
* The tumours may spread withing the ventricular system via the cerebrospinal fluid.
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* The tumours may spread within the ventricular system via the cerebrospinal fluid.
 
* Growth is generally expansile, but it can be invasive and destructive.
 
* Growth is generally expansile, but it can be invasive and destructive.
  
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