Absent Internal Carotid Artery With Intact Circle of Willis (original) (raw)
Related papers
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.
Right Internal Carotid Agenesis : A Rare Case Anatomical, Neurosurgical and Radiological Perspective
2014
We present a case of 35 year old female with Right Internal carotid artery agenesis . The Axial and coronal T2- weighted MRI demonstrated an absent right internal carotid artery flow void. A subsequent magnetic resonance angiography showed absence of the right internal carotid artery. This finding was confirmed by magnetic resonance angiography of the cervical vessels, and axial computed tomography angiography showed agenesis of the right carotid artery. The literature reports such finding in association with other anomalies such as transsphenoidal encephaloceles and circle of Willis aneurysms. These associations were not observed in the present case. The patient remained asymptomatic.
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.
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.
Carotid agenesis with intercavernous anastomosis
Turkish Neurosurgery, 2010
Agenesis of internal carotid artery (ICA) is rare. Association of agenesis with abnormal arterial communication between the cavernous segment of the carotid arteries is extremely rare. We present a case of a middle-aged woman who presented with sudden onset severe holocranial headache. She was investigated and diagnosed to have sub-arachnoid hemorrhage on CT scan. Digital Subtraction Angiogram revealed absent right internal carotid artery. The right middle cerebral artery received blood supply from an incidentally detected intercavernous anastomosis from the left internal carotid artery. No aneurysm, arteriovenous malformation or any other vascular abnormality was detected. The patient was managed conservatively. She has been asymptomatic for five years on follow up.
International Journal of Oral-Medical Sciences, 2016
We describe a case of trigeminal neuralgia caused by compensatory enlargement of the basilar artery in a patient with bilateral agenesis of the internal carotid arteries. A 46-year-old man experienced sharp, stabbing pain in the left face when washing his face. In imaging examinations, magnetic resonance imaging(MRI)revealed displacement of the left trigeminal nerve due to basilar artery enlargement and leftward deviation, but no brain tumors or other abnormalities. The left internal carotid artery was not visible on magnetic resonance angiography(MRA), but marked enlargement of bilateral vertebral and basilar arteries was seen, along with considerable leftward deviation of the basilar artery. The anterior and middle cerebral arteries constituting the anterior circulation were bilaterally connected with the posterior communicating artery, which was enlarged. Bilateral internal carotid arteries were vestigially interrupted from the bifurcation of the common carotid artery. No carotid canals were apparent on either side on computed tomography (CT). For his symptoms, we managed his pain using carbamazepine, and instructed to follow a low-salt, low-fat diet and to avoid excessive alcohol consumption. Our case report suggest that imaging examination(e.g. CT, MRA and MRI)are essential when investigating trigeminal neuralgia, in order to visualize the head and neck region and identify any causal vessels and confirm the presence or absence of tumors. In addition, patients with abnormal hemodynamic status such as agenesis of an internal carotid artery or megadolichobasilar anomaly should undergo regular follow-up due to the high risk of cerebral hemorrhage and cerebral infarction.