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AJNR - American Journal of Neuroradiology

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Arteriovenous Fistulas at the Cervicomedullary Junction Presenting with Subarachnoid Hemorrhage: Six Case Reports with Special Reference to the Angiographic Pattern of Venous Drainage

Yutaka Kai^a, Jun-ichiro Hamada^a, Motohiro Morioka^a, Shigetoshi Yano^a, Takamasa Mizuno^a and Jun-ichi Kuratsu^a

^a From the Department of Neurosurgery, Graduate School of Medical Science, Kumamoto University, Kumamoto, Japan

View larger version (155K): [in a new window]   FIG 1. Left vertebral angiogram (early phase), showing abnormal vessels at the cervicomedullary junction. The feeding artery is the meningeal branch of the vertebral artery and ascending drainage route was recognized (arrowhead).

View larger version (157K): [in a new window]   FIG 2. Left vertebral angiogram (late phase), showing shunt flow draining retrogradely into the left superior petrosal sinus (arrowhead).

View larger version (144K): [in a new window]   FIG 3. Postoperative left vertebral angiogram, demonstrating complete disappearance of the abnormal vessels.

View larger version (137K): [in a new window]   FIG 4. Left vertebral angiogram (early phase), showing abnormal vessels at the cervicomedullary junction. The feeder, the anterior spinal artery, feeds directly into the lateral medullary vein (arrow).

View larger version (164K): [in a new window]   FIG 5. Left vertebral angiogram (late phase), showing shunt flow draining retrogradely into the bilateral inferior petrosal vein (arrowhead).

View larger version (177K): [in a new window]   FIG 6. Postoperative left vertebral angiogram, demonstrating complete disappearance of the abnormal vessels.