Table 2:

Anatomic features of the vascular malformations treated

Patient No.	Nidus Type	Shunt	Fistula	Retrograde Venous Pressurization
1	Diffuse	Mixed	N/A	No
2	N/A	Fistulous	Single-hole	No
3	N/A	Mixed	Dural-osseous	Reversed flow in deep venous system
4	Compact	Plexiform	N/A	No
5	N/A	Mixed	Dural	Cortical venous drainage via cavernous sinus to SOV, facial, and scalp veins
6	Compact	Mixed	N/A	Reversed flow through deep and superficial veins
7	Diffuse	Mixed	N/A	No
8	Diffuse	Fistulous	N/A	No
9	Compact	Plexiform	N/A	No
10	Diffuse	Plexiform	N/A	No
11	Compact	Plexiform	N/A	No
12	Compact	Plexiform	N/A	No
13	Compact	Plexiform	N/A	No
14	Compact	Fistulous	N/A	No
15	Compact	Plexiform	N/A	No

Note:—N/A indicates not applicable; SOV, superior ophthalmic vein.