Microsurgical Anatomy of the Temporal Lobe: Part 2—Sylvian Fissure Region and Its Clinical Application

2009 ◽  
Vol 65 (suppl_6) ◽  
pp. ons1-ons36 ◽  
Author(s):  
Hung Tzu Wen ◽  
Albert L. Rhoton ◽  
Evandro de Oliveira ◽  
Luiz Henrique M. Castro ◽  
Eberval Gadelha Figueiredo ◽  
...  
Keyword(s):  
Middle Cerebral Artery ◽  
Clinical Application ◽  
Cerebral Artery ◽  
Lateral Surface ◽  
Artery Aneurysm ◽  
Sylvian Fissure ◽  
Microsurgical Anatomy ◽  
Temporal Stem ◽  
Middle Cerebral Artery Aneurysms ◽  
Anatomic Information

Abstract Objective: We present observations of the anatomy of the sylvian fissure region and their clinical application in neuroimaging, microsurgery for middle cerebral artery aneurysms and insular lesions, frontobasal resections, and epilepsy surgery. Methods: Sixty adult cadaveric hemispheres and 12 adult cadaveric heads were studied after perfusion of the arteries and veins with colored latex. The anatomic information was applied in more than 200 microsurgeries in and around the sylvian fissure region in the past 15 years. Results: The sylvian fissure extends from the basal to the lateral surface of the brain and presents 2 compartments on each surface, 1 superficial (temporal stem and its ramii) and 1 deep (anterior and lateral operculoinsular compartments). The temporal operculum is in opposition to the frontal and parietal opercula (planum polare versus inferior frontal and precentral gyri, Heschl’s versus postcentral gyri, planum temporale versus supramarginal gyrus). The inferior frontal, precentral, and postcentral gyri cover the anterior, middle, and posterior thirds of the lateral surface of the insula, respectively. The pars triangularis covers the apex of the insula, located immediately distal to the genu of the middle cerebral artery. The clinical application of the anatomic information presented in this article is in angiography, middle cerebral artery aneurysm surgery, insular resection, frontobasal resection, and amygdalohippocampectomy, and hemispherotomy. Conclusion: The anatomic relationships of the sylvian fissure region can be helpful in preoperative planning and can serve as reliable intraoperative navigation landmarks in microsurgery involving that region.

scholarly journals Orbitozygomatic Craniotomy for Clipping a Complex Middle Cerebral Artery Aneurysm: 2-Dimensional Operative Video

2019 ◽  
Vol 18 (2) ◽  
pp. E33-E33
Author(s):  
Benjamin K Hendricks ◽  
Robert F Spetzler
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Video Recording ◽  
Artery Aneurysm ◽  
Sylvian Fissure ◽  
Parent Artery ◽  
Parent Vessel ◽  
Institutional Review ◽  
Vessel Patency ◽  
Mca Aneurysm

Abstract Middle cerebral artery (MCA) aneurysms pose a surgical challenge because of the large caliber of the parent artery and the common need to dissect the sylvian fissure to permit access to the proximal and distal control. The neck of the aneurysm should be generously dissected to permit visualization of any adjacent lenticulostriate perforators. This patient demonstrated a left-sided wide-necked bilobed MCA aneurysm at the M1 bifurcation. The aneurysm was approached using a left orbitozygomatic craniotomy with distal sylvian fissure dissection. A single curved clip was applied for aneurysm occlusion, and postoperative angiography demonstrated aneurysm obliteration with parent vessel patency. The patient gave informed consent for surgery and video recording. Institutional review board approval was deemed unnecessary. Used with permission from Barrow Neurological Institute, Phoenix, Arizona.

Outcome for Middle Cerebral Artery Aneurysm Surgery

Neurosurgery ◽  
2010 ◽  
Vol 67 (3) ◽  
pp. 755-761 ◽  
Author(s):  
Michael K. Morgan ◽  
Wattana Mahattanakul ◽  
Andrew Davidson ◽  
John Reid
Keyword(s):  
Risk Factors ◽  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Surgical Outcome ◽  
Artery Aneurysm ◽  
Morbidity Rate ◽  
Mortality And Morbidity ◽  
Logistic Analysis ◽  
Middle Cerebral Artery Aneurysms ◽  
Cerebral Artery Aneurysm

Abstract OBJECTIVE To assess in depth the variables contributing to adverse surgical outcome for repair of unruptured middle cerebral artery aneurysms. METHODS Prospectively collected data between October 1989 and June 2009 were examined retrospectively. Putative risk factors were investigated with univariate and multivariate logistic regression analyses. RESULTS In this study, 263 patients (339 aneurysms) underwent surgical clipping in 280 operations for unruptured middle cerebral artery aneurysms. The overall surgical mortality and morbidity rate was 5% (95% confidence interval [CI], 2.9–8.3). Multivariate logistic analysis of risk factors revealed that age and aneurysm size were independent predictors of surgical outcome. Patients < 60 years of age with an aneurysm ≤ 12 mm constituted a low-risk group with a procedure-related combined mortality and morbidity of 0.6% (95% CI, 0–3.8). Patients < 60 years of age with an aneurysm > 12 mm had a procedure-related combined mortality and morbidity of 7.4% (95% CI, 1–24.5). Patients ≥ 60 years of age with an aneurysm of ≤ 12 mm had a procedure-related combined mortality and morbidity of 9.3% (95% CI, 4.3–18.3). Patients ≥ 60 years of age with an aneurysm > 12 mm had a procedure-related combined mortality and morbidity of 22.2% (95% CI, 8.5–45.8). CONCLUSION Age and size of aneurysm were the only 2 independent predictors of surgical outcome.

Nuances of Middle Cerebral Artery Aneurysm Microsurgery

Neurosurgery ◽  
2001 ◽  
Vol 48 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Douglas Chyatte ◽  
Rebecca Porterfield
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Artery Aneurysm ◽  
Surgical Anatomy ◽  
Surgical Approaches ◽  
Common Source ◽  
Transsylvian Approach ◽  
Microsurgical Clipping ◽  
Technical Requirements ◽  
Middle Cerebral Artery Aneurysms

Abstract Middle cerebral artery aneurysms, a common source of subarachnoid hemorrhage, occur predominantly at the main bifurcation of the middle cerebral artery. Microsurgical clipping is the most effective treatment of these aneurysms because of their peripheral location, wide necks, and straightforward surgical anatomy. Despite the moderate technical requirements of this type of surgery, patients with ruptured aneurysms often have poor outcomes because of the high incidence of intracerebral hematomas. Although several different surgical approaches can be used, we favor a lateral-to-medial transsylvian approach for most aneurysms. This description of our surgical technique stresses minimizing retraction to avoid injury to the brain and preparing broad-based middle cerebral artery aneurysms for clipping. Management of outcomes when using these techniques also is presented.

Surgical clipping of a large left middle cerebral artery aneurysm

2015 ◽  
Vol 38 (videosuppl1) ◽  
pp. Video13
Author(s):  
M. Yashar S. Kalani ◽  
Peter Nakaji ◽  
Joseph M. Zabramski ◽  
Robert F. Spetzler
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Artery Aneurysm ◽  
Left Middle Cerebral Artery ◽  
Middle Cerebral Artery Aneurysm ◽  
Surgical Clipping ◽  
Microsurgical Clipping ◽  
Middle Cerebral Artery Aneurysms ◽  
Cerebral Artery Aneurysm ◽  
Left Middle

Middle cerebral artery aneurysms, especially those with complex morphology, are considered excellent aneurysms for surgical clipping, given the challenges that exist with current endovascular techniques. We present a case of a large, complex, left middle cerebral artery aneurysm treated with microsurgical clipping. This video highlights critical steps in obtaining proximal and distal control as well as subarachnoid dissection necessary to prepare the aneurysm for final clipping.The video can be found here: http://youtu.be/RlKH2Km9z5Y.

scholarly journals Suprapraorbital “key-hole” Approach for Surgical Treatment of Middle Cerebral Artery Aneurysms

2018 ◽  
Vol 27 (4) ◽  
pp. 346-351
Author(s):  
Alexandre Haddad De Souza ◽  
Juan Antonio Castro Flores ◽  
Carlos Eduardo Roelke ◽  
Felipe Romero Vera ◽  
José Carlos Esteves Veiga
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Artery Aneurysm ◽  
Surgical Instruments ◽  
Field Exposure ◽  
Incidental Aneurysms ◽  
Surgical Field ◽  
Surgical Corridor ◽  
Middle Cerebral Artery Aneurysms ◽  
Cerebral Artery Aneurysm

Objective. To describe details and technical difficulties observed in the use of this access for the treatment of middle cerebral artery aneurysms. Methods. This is a retrospective study including 15 patients with middle cerebral artery aneurysm operated on using this technique (two ruptured aneurysms and 13 incidental aneurysms). We considered age, gender, laterality of the aneurysm, and whether it was ruptured. We evaluated the surgical corridor (surgical field exposure and ease of handling of the surgical instruments), surgery time, complications, functional and cosmetic results. Results. This access provides adequate exposure of the surgical field, but the restricted working angle makes it difficult to dissect the aneurysm and, especially, to place the definitive clip. Conclusion. The restriction of the working angle may compromise the safety of the surgery. It is important to determine the specific indications for this access, particularly in cases of incidental aneurysms.

Proposed Use of Prophylactic Decompressive Craniectomy in Poor-grade Aneurysmal Subarachnoid Hemorrhage Patients Presenting with Associated Large Sylvian Hematomas

Neurosurgery ◽  
2002 ◽  
Vol 51 (1) ◽  
pp. 117-124 ◽  
Author(s):  
Edward R. Smith ◽  
Bob S. Carter ◽  
Christopher S. Ogilvy
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Decompressive Craniectomy ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Artery Aneurysm ◽  
Pathological Process ◽  
Sylvian Fissure ◽  
Excellent Outcome ◽  
Number Of Patients

Abstract OBJECTIVE As a group, patients who present in poor neurological grade after aneurysmal subarachnoid hemorrhage (SAH) often have poor outcomes. There may be subgroups of these patients, however, in which one pathological process predominates and for which the initiation of specific therapeutic interventions that target the predominant pathological process may result in improved outcome. We report the use of prophylactic decompressive craniectomy in patients presenting in poor neurological condition after SAH from middle cerebral artery aneurysms with associated large sylvian fissure hematomas. Craniectomy allowed significant parenchymal swelling in the posthemorrhagic period without increased intracranial pressure (ICP) or herniation syndrome. METHODS Eight patients (mean age, 56.5 yr; age range, 42–66 yr) presented comatose with SAH (five Hunt and Hess Grade IV, three Hunt and Hess Grade V). Radiographic evaluations demonstrated middle cerebral artery aneurysm and associated large sylvian fissure hematoma (mean clot volume, 121 ml; range, 30–175 ml). Patients were brought emergently to the operating room and treated with a modification of the pterional craniotomy and aneurysm clipping that included a planned craniectomy and duraplasty. A large, reverse question mark scalp flap was created, followed by bone removal with the following margins: anterior, frontal to the midpupillary line; posterior at least 2 cm behind the external auditory meatus; superior up to 2 cm lateral to the superior sagittal sinus; and inferior to the floor of the middle cranial fossa. Generous duraplasty was performed using either pericranium or suitable, commercially available dural substitutes. RESULTS All of the eight patients tolerated the craniectomy without operative complications. Postoperatively, all patients experienced immediate decreases in ICP to levels at or below 20 mm Hg (presentation mean ICP, 31.6 mm Hg; postoperative mean ICP, 13.1 mm Hg). ICP control was sustained in seven of eight patients, with the one exception being due to a massive hemispheric infarction secondary to refractory vasospasm. Follow-up (≥1 yr, except for one patient who died during the hospital stay) demonstrated that the craniectomy patients had a remarkably high number of good or excellent outcomes. The outcomes in the hemicraniectomy group were five good or excellent, one fair, and two poor or dead. CONCLUSION The data gathered in this study demonstrate that decompressive craniectomy can be performed safely as part of initial management for a subcategory of patients with SAH who present with large sylvian fissure hematomas. In addition, the performance of decompressive craniectomy in the patients described in this article seemed to be associated with rapid and sustained control of ICP. Although the number of patients in this study is small, the data lend support to the hypothesis that decompressive craniectomy may be associated with good or excellent outcome in a carefully selected subset of patients with SAH.

Microsurgical anatomy of the middle cerebral artery

1981 ◽  
Vol 54 (2) ◽  
pp. 151-169 ◽  
Author(s):  
Hirohiko Gibo ◽  
Christopher C. Carver ◽  
Albert L. Rhoton ◽  
Carla Lenkey ◽  
Robert J. Mitchell
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Sylvian Fissure ◽  
Microsurgical Anatomy ◽  
Main Trunk ◽  
Content Type ◽  
Posterior Parietal ◽  
Relationship Of ◽  
The Relationship ◽  
Temporal Middle

✓ The microsurgical anatomy of the middle cerebral artery (MCA) was defined in 50 cerebral hemispheres. The MCA was divided into four segments: the M1 (sphenoidal) segment coursed posterior and parallel to the sphenoid ridge; the M2 (insular) segment lay on the insula; the M3 (opercular) segment coursed over the frontoparietal and temporal opercula; and the M4 (cortical) segment spread over the cortical surface. The Sylvian fissure was divided into a sphenoidal and an operculoinsular compartment. The M1 segment coursed in the sphenoidal compartment, and the M2 and M3 segments coursed in the operculoinsular compartment. The main trunk of the MCA divided in one of three ways: bifurcation (78% of hemispheres), trifurcation (12%), or division into multiple trunks (10%). The MCA's that bifurcated were divided into three groups: equal bifurcation (18%), inferior trunk dominant (32%), or superior trunk dominant (28%). The MCA territory was divided into 12 areas: orbitofrontal, prefrontal, precentral, central, anterior parietal, posterior parietal, angular, temporo-occipital, posterior temporal, middle temporal, anterior temporal, and temporopolar. The smallest cortical arteries arose at the anterior end and the largest one at the posterior end of the Sylvian fissure. The largest cortical arteries supplied the temporo-occipital and angular areas. The relationship of each of the cortical arteries to a number of external landmarks was reviewed in detail.

scholarly journals Clipping of bilateral MCA aneurysms and a coiled ACOM aneurysm through a modified lateral supraorbital craniotomy

2015 ◽  
Vol 38 (videosuppl1) ◽  
pp. Video19 ◽  
Author(s):  
Ziad A. Hage ◽  
Fady T. Charbel
Keyword(s):  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Artery Aneurysm ◽  
Sylvian Fissure ◽  
Left Middle Cerebral Artery ◽  
Flow Measurements ◽  
Mca Aneurysm ◽  
The Right ◽  
Left Middle ◽  
Supraorbital Craniotomy

We showcase the microsurgical clipping of a left middle cerebral artery (MCA) aneurysm-(B) done through a modified right lateral supraorbital craniotomy, as well as clipping of a previously coiled anterior communicating (ACOM) artery aneurysm-(C) and a bilobed right MCA aneurysm-(A). Splitting of the right sylvian fissure is initially performed following which a subfrontal approach is used to expose and dissect the contralateral sylvian fissure. The left MCA aneurysm is identified and clipped. The ACOM aneurysm is then clipped following multiple clip repositioning based on flow measurements. The right MCA aneurysm is then identified and each lobe is clipped separately.The first picture showcased in this video is a side to side right and left ICA injection in AP projection. In this picture, (A) points to the bilobed right MCA aneurysm, (B) to the left middle cerebral artery (MCA) aneurysm, and (C) to the previously coiled anterior communicating (ACOM) artery aneurysm. The red dotted line shows that both MCA aneurysms lie within the same plane which makes it easier to clip both of them, through one small craniotomy.The video can be found here: http://youtu.be/4cQC7nHsL5I.

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