Bahşi Y Z, Uysal H, Peker S, Yurdakul M
Department of Neurology, S.B. Ankara Hospital, Turkey.
Stroke. 1993 Dec;24(12):2114-7. doi: 10.1161/01.str.24.12.2114.
Persistent primitive proatlantal intersegmental artery (proatlantal artery I) is an anastomotic channel between the carotid and vertebrobasilar arterial systems. Persistence of this embryonic anastomosis is very rare. The "top of the basilar" syndrome is usually due to occlusion of thalamoperforating arteries by emboli that rise from the vertebrobasilar arterial system. In this case, however, the emboli stemmed from atherosclerotic plaques in the carotid system.
A 55-year-old woman was hospitalized with top of the basilar syndrome. A brain scan showed hypodense lesions extending from the mesencephalon to both thalami. Digital subtraction angiography of the cerebral circulation was performed, which revealed a proatlantal artery I on the left side. In addition, atheromatous plaques were seen along the internal and common carotid arteries on the same side.
The occurrence of proatlantal artery I is extremely rare. Top of the basilar syndrome is also rarely encountered. To our knowledge, this is the first report of a patient with both conditions.
永存原始前寰椎间节段动脉（前寰椎动脉I）是颈动脉和椎基底动脉系统之间的吻合通道。这种胚胎期吻合的持续存在非常罕见。“基底动脉尖”综合征通常是由于来自椎基底动脉系统的栓子阻塞丘脑穿通动脉所致。然而，在本病例中，栓子源于颈动脉系统的动脉粥样硬化斑块。
一名55岁女性因基底动脉尖综合征入院。脑部扫描显示低密度病变从中脑延伸至双侧丘脑。对脑循环进行了数字减影血管造影，结果显示左侧存在前寰椎动脉I。此外，在同一侧的颈内动脉和颈总动脉沿线可见动脉粥样斑块。
前寰椎动脉I的发生极为罕见。基底动脉尖综合征也很少见。据我们所知，这是首例同时患有这两种病症的患者报告。
