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| | Vein of Galen Aneurysms |
 | | Venous drainage from the medial deep nuclei and from the medial occipital and temporal lobes and the superior cerebellar surface occurs through the galenic system. |
 | | Since the size and number of perpendicular crossings of primitive arteries and veins are greatest near the relatively massive embryonic choroid plexuses, niduses of most angiomas are thus deeply situated. |
 | | Usually, the angioma is situated in the medial posterior hemispheres, the superior cerebellum, the brain stem, or the deep ganglionic structures. |
| www.ucsf.edu /nreview/05-Vascular/VofGalenAneurysm.html (706 words) |
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