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Schematic drawing of the variations in the A 1 segment. The A 1 segment of the anterior cerebral artery initially arises from the ipsilateral internal carotid artery (IC) as a common trunk (arrow), then divides into two arteries near the ipsilateral optic nerve. These A 1 segments (crossed arrow and arrow with circle) do not merge. Note that the contralateral left A 1 (double arrow) merged only into right superior A 1 (crossed arrow).
Source publication
A rare abnormality of the A1 segment of the anterior cerebral artery (ACA) is reported. The right ACA bifurcated into two parts at the middle point of the A1 segment, and these segments did not rejoin. The superior right A1 segment connected with the left A1 and formed a single pericallosal artery. The inferior right A1, from which the right ophtha...
Context in source publication
Context 1
... run separately above and under the ipsilateral optic nerve, and merge into a single ACA (5 cases). 3,5,9,10) Our case is a new type of ACA duplication that is neither fenestration nor truncal duplication, since one ACA arose from the ipsilateral ICA, duplicated in the course of the A 1 segment, and the duplicated arteries did not merge (Fig. 4). In addition, the present patient had a single pericallosal artery and duplicate ophthalmic arteries, which originated from the ICA and the ipsilateral abnormal ACA. These complicated anomalies including duplicated ophthalmic arteries were thought to originate at Padget stages 4 and 5 in fetal life. 7,8) The precise mechanism of the ...
Citations
... Moreover, anatomical variations of the anterior cerebral artery are quite common and are often described in the medical journals [1]. These variants refer to hypoplasia or aplasia, accessory anterior cerebral artery [2], anomalous origin of the callosomarginal artery [3] or uncommon origin of anterior communicating artery [4]. Despite that, only a small number of patterns regarding the fronto-orbital artery have been described, some authors mentioning its anomalous origins [5,6]. ...
... The fronto-orbital artery (FOA) is the first cortical branch of the anterior cerebral artery (ACA), normally arising from the A2 segment [7,8]. Some authors mention its origin from the A1 segment of ACA [1,2], the pericallosal artery [2,5], the callosal marginal artery or sometimes from the fronto-polar artery [9]. The trajectory of the fronto-orbital artery usually follows an anterior course, along the medial surface of the fronto-orbital gyrus. ...
... The fronto-orbital artery (FOA) is the first cortical branch of the anterior cerebral artery (ACA), normally arising from the A2 segment [7,8]. Some authors mention its origin from the A1 segment of ACA [1,2], the pericallosal artery [2,5], the callosal marginal artery or sometimes from the fronto-polar artery [9]. The trajectory of the fronto-orbital artery usually follows an anterior course, along the medial surface of the fronto-orbital gyrus. ...
The anatomical variations of the fronto-orbital artery are uncommon and rarely described in literature. During the dissection of a 64-year-old female formalized brain, we discovered a particular congenital abnormality regarding the arterial supply of the right fronto-orbital gyrus. We identified three arterial sources: a low caliber ipsilateral fronto-orbital artery that arises from the A2 segment of the right anterior cerebral artery and ends in the posterior part of the fronto-orbital gyrus, a large aberrant contralateral fronto-orbital artery that arises from the A2 segment of the left anterior cerebral artery, supplying most of the right fronto-orbital gyrus and a small accessory branch of the left anterior cerebral artery passing towards the contralateral fronto-orbital gyrus. These abnormalities are associated with a partially duplicated anterior communicating artery. This case shows a unique pattern of congenital brain vascular abnormalities that may have clinical and surgical implications.
Infarction of the territory of the anterior cerebral artery (ACA) can be the result of carotid artery atherosclerosis and embolism, cardioembolism, local ACA atherosclerosis, or ACA dissection. Considerable variation describes the anatomy of the ACA and the brain regions it supplies. Neurologic impairments following infarction in the ACA territory include weakness, sensory loss, apraxia and callosal disconnection signs, akinetic mutism and motor neglect, language disturbance, and urinary incontinence.
If we use the same naming policy of middle cerebral arterial anomalies, then accessory anterior cerebral arteries (ACAs) should be applied for ACA anomalies originating from the ACA. We experienced such a rare ACA anomaly, which we referred to as true accessory ACA.
A patient with a rare variation of fronto-orbital artery (FOA) that developed generalized tonic and clonic seizures is reported. The epilepsy focus was in her left frontal region, where blood was supplied by the contralateral fronto-orbital artery. The region was vulnerable to ischemic changes due to a decrease in blood CO2 gas caused by an increase in endogenous progesterone in the luteal period. The anomaly illustrates an important mechanism of ischemia in epilepsy.
