Vascular variations associated with anterior communicating artery aneurysms-an intraoperative study.

This microsurgical study attempts to analyze the intraoperative anatomic vascular variations associated with the anterior communicating artery (ACoA) aneurysms in 120 patients who were operated on at the Neurosurgical Department of Atatürk University Medical School, Erzurum, Türkiye. All patients underwent radical surgery for aneurysm by the right pterional approach. The findings were recorded during surgical intervention and through the slides and videotapes of the operations. A total of 72 (60%) of our patients had vascular variations in the vicinity of the ACoA. Marked hypoplasia of the A1 segment of anterior cerebral artery (ACA) at the right or left side (26.6%, n = 32), median artery of the corpus callosum (MACC) (14%, n = 17), duplication of the ACoA (8.3%, n = 10), duplication of the A1 segment of ACA (7.5%, n = 9) and azygous pericallosal artery (3.3%, n = 4) were the variations that were observed during operations. A retrospective study of the cerebral angiograms of the cases indicated that preoperative diagnosis of the A1 or ACoA duplication was not possible, 14 (82.4%) of the 17 MACC's were easily identified, while three (17.6%) could not be diagnosed. From this intraoperative study, we concluded that, regardless of whether a vascular variation has been identified preoperatively, ACoA aneurysm surgery should be undertaken with the possibility of an MACC in mind. The recognition of the anatomic variations of the ACoA and the detailed knowledge of the microvascular relationships of the aneurysms will allow the neurosurgeons to construct a better and safer microdissection plan to save time on the one hand and to prevent postoperative neurological deficits on the other.