Department of Diagnostic Radiology, Saitama Medical University International Medical Center, 1397-1 Yamane, Hidaka, Saitama, 350-1298, Japan.
Neuroradiology. 2012 Jan;54(1):13-8. doi: 10.1007/s00234-011-0847-1. Epub 2011 Feb 18.
Rarely in the anterior circulation, an anastomosis of the carotid and anterior cerebral arteries occurs when an anomalous branch arises from the ophthalmic segment of the internal carotid artery and anastomoses with the A1-A2 junction of the anterior communicating artery. Right-side predominance is known. To our knowledge, the incidence of carotid-anterior cerebral artery anastomosis has not been reported, so we researched cases in our institution records to determine incidence and investigated characteristic features of the condition on magnetic resonance (MR) angiography.
To isolate such cases, we retrospectively reviewed cranial MR angiographic images of 3,491 consecutive patients in our institution.
We found three cases with carotid-anterior cerebral artery anastomosis (two men, one woman), representing an incidence of 0.086%. The anastomosis was on the right in all three cases. A normal A1 segment of the anterior cerebral artery (ACA) was present in two cases but could not be identified in the remaining case on MR angiographic images that included source images. Two of the three patients demonstrated associated arterial variations in their carotid systems.
On MR angiography, we observed a 0.086% incidence of carotid-anterior cerebral artery anastomosis in our institution and reaffirmed the right-side predominance of this anomaly. We found a high frequency of other associated arterial variations in the carotid system.
在颈内动脉和大脑前动脉的前循环中，罕见情况下会出现异常分支从颈内动脉眼段发出并与前交通动脉的 A1-A2 交界处吻合的吻合。已知右侧占优势。据我们所知，尚未报道颈内-大脑前动脉吻合的发生率，因此我们在医院的病历记录中研究了这些病例，以确定发生率，并在磁共振血管造影上研究该情况的特征。
为了分离出这些病例，我们回顾性地分析了我院 3491 例连续患者的颅磁共振血管造影图像。
我们发现有 3 例颈内-大脑前动脉吻合（2 例男性，1 例女性），发生率为 0.086%。在所有 3 例中，吻合均位于右侧。2 例在前磁共振血管造影图像中可识别到正常的大脑前动脉（ACA）A1 段，但在包括源图像的剩余 1 例中无法识别。这 3 例患者中的 2 例在颈动脉系统中存在其他动脉变异。
在磁共振血管造影上，我们观察到我院的颈内-大脑前动脉吻合发生率为 0.086%，并再次证实了该异常的右侧优势。我们发现颈动脉系统中其他动脉变异的频率很高。
