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Falcotentorial Location of Dural Arteriovenous Fistulas Derived from the Neural Crest as a Risk Factor for Aggressive Clinical Course.
The topographical distribution of dural arteriovenous fistulas (DAVFs) was analyzed based on the embryological anatomy of the dural membrane. Sixty-six consecutive cases of intracranial and spinal DAVFs were analyzed based on the angiography, and each shunt point was identified according to the embryological bony structures. The area of dural membranes was categorized into three different groups: a ventral group located on the endochondral bone (VE group), a dorsal group on the membranous bone (DM group), and a falcotentorial group (FT group) in the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae. The FT group was derived from the neural crest and designated when the dural membrane was formed only with the dura propria (meningeal layer of the dura mater) and not from the endosteal dura. Olfactory groove, falx, tent of the cerebellum, and nerve sleeve of spinal cord were categorized in the FT group, which presented later in life and which had a male predominance, more aggressive clinical presentations, and significant cortical and spinal venous reflux. The FT group was formed only with the dura propria that was considered as an independent risk factor for aggressive clinical course and hemorrhage of DAVFs.
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