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septum pellucidum

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septum pel·lu·ci·dum  (p-ls-dm)
n. pl. septa pel·lu·ci·da (-d)
A thin membrane of nervous tissue that forms the medial wall of the lateral ventricles in the brain.

[New Latin sptum pellcidum : sptum, septum + Latin pellcidum, neuter of pellcidus, transparent.]


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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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