Two Neighboring Spinal Dural Arteriovenous Fistulas with Multiple Bridging Veins Drainage.

Two neighboring spinal dural arteriovenous fistulas (SDAVFs) with multiple bridging veins drainage are extremely rare. Here, we report a 55-year-old man with 2 neighboring SDAVFs at the levels of T4-T5 supplied by the right T5 intercostal artery (common stem of T4 and T5 arteries) with multiple draining veins. Intraoperatively, 3 draining bridging veins between T4 and T5 nerve roots were identified and resected successfully. This case demonstrated the complex microscopic angioarchitecture features of 2 neighboring SDAVFs with multiple draining veins. Although these complex SDAVFs are extremely rare, the clinicians should be aware of the possibility of 2 neighboring SDAVFs.