Effect of morphological characteristics of aneurysms on the rupture of pericallosal artery aneurysms / 中国脑血管病杂志

Objectives: To investigate the morphological characteristics of pericallosal artery aneurysms (PAAs) and to analyze the morphological influence factor of PAA rupture. Methods: From January 2013 to May 2017A,40 consecutive patients with PAA admitted to the Department of Neurosurgery,Xuanwu Hospital, Capital Medical University were enrolled retrospectively. They were diagnosed by whole brain vascular DSA before treatment. Forty patients were divided into ruptured group (n = 22 with 22 aneurysms) and the unruptured group (n = 18 with 23 aneurysms). The morphological parameters of the number of aneurysms in two-dimensional or three-dimensional rotational angiography included diameter, height, width, aneurysm neck width,diameter of parent arteries, and inflow angle of aneurysms, and the aspect ratio, size ratio and length-width ratio (aneurysm diameter/aneurysm width) of each aneurysm were further calculated. The aspect ratio was calculated using aneurysm height/aneurysm neck width and aneurysm diameter/aneurysm neck width, respectively, and the size ratio was calculated using aneurysm height/parent artery diameter and aneurysm diameter/parent artery diameter, respectively. The differences of morphological parameters of PAAs were compared and multivariate logistic regression analysis was performed to preliminarily investigate the morphology of influencing factors of PAA rupture. Results: (1) There were no significant differences in age, male, multiple aneurysms, and risk factors for cardiocerebrovascular diseases between the two groups (all P>0.05). (2) The proportion of irregular aneurysms and the length-width ratio of aneurysms in the rupture group were higher than those in the unruptured group. The difference between the groups was statistically significant (90.9% [20/22] ts. 39. 1% [9/23],χ2 =8. 01); 1. 35 ±0. 36 vs. 1. 01 ±0. 22,t= -3. 85; all P 0. 05). (3) Amongthe 45 aneurysms,the proportion of A3 anterior bifurcation aneurysms was 53.3% (24 aneurysms), and the proportion of the ruptured group and unruptured group was 68. 2% (15/22) and 39. 1% (9/23) respectively. There were no significant differences between the groups (χ2 =0. 381,P = 0. 051). (4) The mean length-width ratio in 45 PAAs was 1. 18. using this as the defined value, the length-width ratio was converted into a two-category variable,and the PAA rupture was used as the dependent variable. The univariate analysis of the morphological parameters in the length-width ratio (> 1. 18) and the irregular aneurysm were included in the multivariate logistic regression analysis. The results showed that the length-width ratio was >1.18 (OR,1.84,95% CI 1.42-28. 11,P =0. 016),and irregular aneurysms (OR,2. 06,95% CI 1. 66-37. 11, P = 0. 009) were the independent risk factor for PAA rupture. Conclusions: The ratio of height-length-width of PAAs and the irregular morphology of aneurysms suggest that PAAs are prone to rupture. The evaluation of PAA morphological parameters should be emphasized in clinical practice.

Ruptured Bilateral Pericallosal Artery Aneurysm in Mirror Position: Case Report

Introduction Pericallosal artery (PA) aneurysms represent 2 to 9% of all intracranial aneurysms, and their management remains difficult. Objective The aim of the present study is to describe the case of an adult woman with subarachnoid hemorrhage and bilateral PA aneurysm in mirror position. Case Report A 46-year-old woman was referred to our institution 20 days after a sudden severe headache. She informed that she was treating her arterial hypertension irregularly, and consumed 20 cigarettes/day. The patient was neurologically intact at admission. A non-contrast computed tomography (CT) on the first day of the onset of the symptoms revealed hydrocephaly and subarachnoid hemorrhage (Fisher III). An angio-CT/digital subtraction arteriography showed bilateral PA aneurysms in mirror position. The patient was successfully treated with surgery via the right interhemispheric approach (because the surgeon is right-handed); the surgeon performed the proximal control with temporary clipping, and introduced an external ventricular drain at the end of the surgery. The patient was discharged on the fourth postoperative day without any additional neurological deficits or ventricular shunts. Conclusion Ruptured PA aneurysm is a surgically challenging aneurysm due to the many anatomical nuances and risk of rebleeding. However, the operativemanagement of ruptured bilateral PA aneurysms is feasible and effective.

Endovascular Treatment of Ruptured Pericallosal Artery Aneurysms

OBJECTIVE: Aneurysms arising from the pericallosal artery (PA) are uncommon and challenging to treat. The aim of this study was to report our experiences of the endovascular treatment of ruptured PA aneurysms. METHODS: From September 2003 to December 2013, 30 ruptured PA aneurysms in 30 patients were treated at our institution via an endovascular approach. Procedural data, clinical and angiographic results were retrospectively reviewed. RESULTS: Regarding immediate angiographic control, complete occlusion was achieved in 21 (70.0%) patients and near-complete occlusion in 9 (30.0%). Eight procedure-related complications occurred, including intraprocedural rupture and early rebleeding in three each, and thromboembolic event in two. At last follow-up, 18 patients were independent with a modified Rankin Scale (mRS) score of 0-2, and the other 12 were either dependent or had expired (mRS score, 3-6). Adjacent hematoma was found to be associated with an increased risk of poor clinical outcome. Seventeen of 23 surviving patients underwent follow-up conventional angiography (mean, 16.5 months). Results showed stable occlusion in 14 (82.4%), minor recanalization in two (11.8%), and major recanalization, which required recoiling, in one (5.9%). CONCLUSION: Our experiences demonstrate that endovascular treatment for a ruptured PA aneurysms is both feasible and effective. However, periprocedural rebleedings were found to occur far more often (20.0%) than is generally suspected and to be associated with preoperative contrast retention. Analysis showed existing adjacent hematoma is predictive of a poor clinical outcome.

Endovascular Treatment for Isolated Dissecting Aneurysm of The Pericallosal Artery Presenting with Spontaneous Subarachnoid Hemorrhage: A Case Report / 신경중재치료의학

Dissecting aneurysms of intracranial artery often arise in the posterior circulation, but those in the anterior circulation are rare, presenting with hemorrhagic event. So, we report an unusual case of isolated dissecting aneurysm of the pericallosal artery presenting with spontaneous subarachnoid hemorrhage. A 46-year-old hypertensive woman presented with severe headache and intense nuchal rigidity after onset of two days. Computed tomography (CT) brain scan revealed a subarachnoid hemorrhage and an interhemispheric hematoma. This was due to dissecting aneurysm of left pericallosal artery on conventional cerebral angiography. Total occlusion of the dissecting aneurysm was performed with five Guglielmi detachable coils, with no apparent procedure-related complications. Endovascular treatment by aneurysm and parent artery occlusion is a relatively reliable alternative to surgery for isolated dissecting aneurysm of pericallosal artery.

In Situ Rescue Bypass for Iatrogenic Avulsion of Parent Artery during Clipping Large Pericallosal Artery Aneurysm

A case of large aneurysm arising from the distal end of an azygous A2 segment is presented. Multiple clip application inadvertently tore the aneurysmal neck, resulting in near avulsion of a right pericallosal artery origin. After an unsuccessful attempt to repair the avulsion, it was treated by occlusion of the origin of the pericallosal artery and an A4-A4 anterior cerebral artery in situ bypass without neurological deficits. The surgical technique and previous reports on side-to-side in situ bypass are discussed.

Traumatic Aneurysm of the Pericallosal artery

Traumatic intracranial aneurysms are rare, compromising less than 1% of intracranial aneurysms. The case of 20-year-old man suffered from delayed frontal intracerebral hematoma, subarachnoid hemorrhage and intraventricular hemorrhage from traumatic pericallosal aneurysm 12 days after head injury is presented. Traumatic pericallosal artery aneurysm is always near the falcine edge, is unrelated to arterial branching point. Sudden movement of brain and artery causes vessel wall injury against the stationary edge of the falx. Because of high mortality rate of ruptured traumatic aneurysm, clinical suspicion must be focused on the prompt diagnostic work-up and early treatment.

One Case of Traumatic Pericallosal Artery Aneurysm: A Case Report

Traumatic aneurysm is known to be very rare vascular disease. The authors experienced one case of traumatic aneurysm that occured on pericallosal artery after closed head injury. Traumatic aneurysm was suspected by enlarged traumatic ICH on the corpus callosum in brain CT scan and presence of signal voiding at the center of the hematoma in brain MRI scan and then confirmed by transfermoral carotid angiography. Clipped neck of this traumatic aneurysm successfully via interhemispheric approach, we report a case of traumatic pericallosal artery aneurysm with review of literatures.

Two Cases of Traumatic Pericallosal Artery Aneurysm: A Case Report

Two patients with traumatic aneurysm were children below 10 years and the aneurysmal sac located at the peripheral branch o f the anterior cerebral artey. One of the traumatic aneurysm had been found by rupture of aneurysmal sac during medical treatment under the impression of traumatic cerebral hemorrhage. The other had been found during disabiliy evaluation with unruptured status. In the latter case, traumatic aneurysm was suspected by the small sized enhancing lesion below the falx cerebri in Brain CT scan and confirmed by transfemoral carotid angiography. We clipped neck of these traumatic aneurysm successfully. So. we report these two cases of traumatic aneurysms with review of the literatures.