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septum pellucidum

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septum pellucidum [′sep·təm pə′lü·səd·əm]
(anatomy)
A thin translucent septum forming the internal boundary of the lateral ventricles of the brain and enclosing between its two laminas the so-called fifth ventricle.


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2) MRI-associated features include: (2,4) * absent cavum septum pellucidum (80-90%) * focally thin or absent corpus callosum * polymicrogyria and heterotopias * optic nerve hypoplasia * roofing membrane covering the defect * tenting of the ventricle, pointing to the defect.
NORMAL MRI: Compare with the patient's MRI, which demonstrates agenesis of corpus callosum (CC) and absence of septum pellucidum on coronal view (see on right).
The tumor is thought to be derived from the granular neurons of the small gray nuclei of the septum pellucidum and fornix, or from remnants of the subependymal plate of the lateral ventricles.
 
 
 
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