Abstract：
BACKGROUND: Dandy\'s superior petrosal vein (SPV) anatomy is highly relevant for neurosurgeons. The SPV drains into the superior petrosal sinus (SPS), closely related to the trigeminal and internal auditory pores.
METHODS: The archived enhanced MRI files of a male patient were studied.
RESULTS: An infratentorial ring-shaped (RS) SPV was found on the petrosal surface of the right cerebellar hemisphere. It was inserted in the SPS above the internal auditory pore, postero-lateral to the trigeminal pore. The anterior arm of that venous ring received a delicate supratrigeminal plexus of veins from the pontine surface and continued as a single venous trunk on the cerebellar surface.
CONCLUSIONS: Such previously unreported RS-SPV is of utmost importance to be identified before subtemporal transtentorial and retrosigmoid approaches for different neurosurgical reasons.
METHODS: The archived enhanced MRI files of a male patient were studied.
RESULTS: An infratentorial ring-shaped (RS) SPV was found on the petrosal surface of the right cerebellar hemisphere. It was inserted in the SPS above the internal auditory pore, postero-lateral to the trigeminal pore. The anterior arm of that venous ring received a delicate supratrigeminal plexus of veins from the pontine surface and continued as a single venous trunk on the cerebellar surface.
CONCLUSIONS: Such previously unreported RS-SPV is of utmost importance to be identified before subtemporal transtentorial and retrosigmoid approaches for different neurosurgical reasons.
摘要：
背景：Dandy的岩上静脉（SPV）解剖与神经外科医生高度相关。SPV排入岩上窦(SPS),与三叉神经和内部听觉毛孔密切相关。
方法：研究一名男性患者的增强MRI档案。
结果：在右小脑半球的岩面上发现了幕下环形（RS）SPV。它被插入内部听觉孔上方的SPS中，三叉神经孔的后外侧。该静脉环的前臂从脑桥表面接受了精致的心房上静脉丛，并在小脑表面上继续作为单个静脉干。
结论：这种以前未报告的RS-SPV对于不同的神经外科原因，在颞下及幕下和乙状窦后入路之前进行鉴定至关重要。
方法：研究一名男性患者的增强MRI档案。
结果：在右小脑半球的岩面上发现了幕下环形（RS）SPV。它被插入内部听觉孔上方的SPS中，三叉神经孔的后外侧。该静脉环的前臂从脑桥表面接受了精致的心房上静脉丛，并在小脑表面上继续作为单个静脉干。
结论：这种以前未报告的RS-SPV对于不同的神经外科原因，在颞下及幕下和乙状窦后入路之前进行鉴定至关重要。
