Segmental agenesis of the internal carotid artery distal to the posterior communicating artery leading to the definition of a new embryologic segment (original) (raw)
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Bilateral internal carotid artery agenesis: a case report
Jornal Vascular Brasileiro, 2014
Agenesis of the internal carotid artery (ICA) is defined as a congenital absence of the carotid canal and occurs in less than 0.01% of the population. This anomaly is usually diagnosed as an incidental finding or after a cerebrovascular event. We present the case of a 36-year-old woman, with bilateral agenesis of the ICA who had suffered a subarachnoid hemorrhage due to ruptured aneurysm of the basilar artery. Therefore, agenesis of the ICA is a condition that, although rare, should be considered since there is a risk of coexistence with other life-threatening conditions such as aneurysms.
Multiple aneurysms associated with agenesis of internal carotid artery
Turkish Neurosurgery, 2009
not be identifi ed on the left side during angiography so a common carotid artery injection was done (Figure 1A). The contrast fi lled the external carotid artery and its branches (Figure 1B), while the left ICA could not be visualized. The right ICA showed dominant circulation with fi lling of the bilateral anterior cerebral arteries (ACA) and middle cerebral arteries (MCA) through the anterior communicating artery (Acom) (Figure 2). A large paraclinoid aneurysm was present on the right ICA. An additional Acom artery aneurysm was also present. (Figure 2).The left vertebral injection revealed fi lling of the MCA from the left posterior communicating artery (Pcom) (Figure 3). The patient was operated using a right pterional transsylvian approach and the Acom aneurysm was clipped. The anterior clinoid was then drilled and the right ICA mobilized after cutting the distal dural ring. The ICA paraclinoid aneurysm was clipped using a fenestrated clip that took the ICA in its fenestration. The patient had no neurological defi cits following surgery. DISCUSSION The development of the common carotid artery and internal carotid artery has been a subject of controversy (4). Padget did an extensive study on the subject. Specifi c cranial vessels can be identifi ed at 3 mm crown-rump length of the fetus.
Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie, 2018
Agenesis, aplasia and hypoplasia of the internal carotid artery are rare congenital malformations. They are usually asymptomatic and incidentally discovered through ultrasound or imagistic tests. The aim of this study is to improve their management in our Departments. We report here the case of a 39-year-old woman addressed to our ambulatory in 2013 for benign symptoms like dizziness and headache. Imagistic findings (magnetic resonance imaging of the brain, and cervical spine, and magnetic resonance angiography of the head and neck) indicated a very rare condition: left internal carotid artery agenesis accompanied by the absence of the pre-communicant part of the left anterior cerebral artery and of the right posterior communicating artery. Internal carotid artery agenesis is an uncommon congenital anomaly and it could be misdiagnosed as stenosis/occlusion of this artery. This condition is important to be recognized due to the associated hemodynamic changes and in order to discover ...
Radiology Case Reports, 2017
Congenital absence of internal carotid artery (ICA) is a rare anomaly seen in around 0.01% of the population. High incidence of aneurysms is reported in these patients population. Many patients are asymptomatic as the development of a collateral circulation ensures cerebral perfusion. The embryology, the common collateral pathways, and the imaging findings associated with this anomaly are illustrated with 2 new cases. We reported the cases of 2 totally asymptomatic patients at the time of imaging in which ICA agenesis was proved on computed tomography angiography. On imaging, all the most important findings necessary for ICA agenesis diagnosis have been identified and described. Noninvasive imaging techniques are currently the mainstay of ICA agenesis diagnosis.
Clinical medicine. Case reports, 2008
Aneurysms of the complex of the anterior cerebral artery are frequently associated with anatomic variations of the circle of Willis. We describe a case of aneurysmal rupture of the anterior communicating artery, a variant of the anterior cerebral artery. The aneurysm appeared to be situated on this vessel proximal to the infered site of the AcoA. Surgery was performed at the 6th day after hemorrhage. The anterior communicating artery aneurysm was clipped. The post operative course was unventful, with complete recovery. In our case, an extremely rare variation of the proximal tract of the anterior cerebral artery, i.e. an infraoptic course of the proximal precommunicating tract under the optic nerve, with the distal A1 tract anterior to the chiasm and positioned between the optic nerves, is presented.
2016
Abstract: Aneurysms of the complex of the anterior cerebral artery are frequently associated with anatomic variations of the circle of Willis. We describe a case of aneurysmal rupture of the anterior communicating artery, a variant of the anterior cerebral artery. The aneurysm appeared to be situated on this vessel proximal to the infered site of the AcoA. Surgery was performed at the 6th day after hemorrhage. The anterior communicating artery aneurysm was clipped. The post operative course was unventful, with complete recovery. In our case, an extremely rare variation of the proximal tract of the anterior cerebral artery, i.e. an infraoptic course of the proximal precommunicating tract under the optic nerve, with the distal A1 tract anterior to the chiasm and positioned between the optic nerves, is presented.
Bilateral Internal Carotid Artery Agenesis and Posterior Circulation Stroke: A Rare Association
Journal of Stroke and Cerebrovascular Diseases, 2020
Bilateral ICA agenesis is a rare developmental anomaly of the anterior circulation. It can be accompanied by various posterior circulation abnormalities including aneurysms, dolichoectatic vessels. We report the clinical presentation, imaging findings and management of a unique case of a 25 year old man having bilateral internal carotid agenesis with cerebellar ischemic lesions secondary to thrombus formation in dolichoectatic basilar artery.