Craniopharyngioma and anterior central space of brain base / 中国医师进修杂志

Objective:To analyze the surgical (anatomical) approach of craniopharyngioma based on the concept of anterior central space of brain base.Methods:The clinical data of MRI images of 10 cases of craniopharyngioma who treated in Sanbo Brain Hospital, Capital Medical University from January 2021 to December 2021 were analyzed retrospectively. The brain cisterns involved in the growth of craniopharyngioma were analyzed from the perspective of anterior central space of brain base. Meanwhile, the surgical approach and the basis of selection were discussed.Results:Among all the surgical approaches that can reach the anterior central space of the brain base, the fronto-basal interhemispheric approach was the best.Conclusions:The concept of anterior central space of the brain base is a new observation and interpretation of the anatomy of the brain base from a new perspective, and then create a new concept of brain base surgery. As a new method to analyze the surgical anatomy of this area, its inclusion has important clinical significance.

Microneurosurgery treatment for 41 recurrent craniopharyngioma cases / 中国医师进修杂志

Objective:To investigate the method and effect of microneurosurgery in the treatment of recurrent craniopharyngioma.Methods:The clinical data of 41 recurrent craniopharyngioma patients treated by microneurosurgery in Capital Medical University Sanbo Brain Hospitalfrom January 2018 to January 2022 were retrospectively analyzed.Results:Among the 41 patients, 38 cases were treated with the frontal basal interhemispheric approach and 3 cases with the translongitudinal fissure combined with the transSylvian fissure approach. Gross total resection was performed in 34 cases (82.9%) and subtotal resection in 7 cases (17.1%). One patient (2.4%) died of pulmonary embolism during perioperative period. All patients had transient electrolyte disorder after operation, and recovered within 3 months after treatment. All patients had endocrine dysfunction. After 3 months of hormone replacement therapy, 11 patients were cured. Visual acuity decreased in 3 cases after operation, and 2 cases improved after treatment.Conclusions:Surgical treatment of recurrent craniopharyngioma is very difficult, which is a great challenge for doctors and patients. However, through the individualized evaluation of the patients and the meticulous technique of the doctors during the operation, a satisfactory effect can be achieved post the operation of recurrent craniopharyngioma.

Abordaje interhemisférico contralateral transfalcino para resección de empendimoma supratentorial extraventricular: presentación de caso y análisis de literatura / Contralateral Transfalcine Interhemispheric Approach for Resection of Extraventricular Supratentorial Empendymoma: Case Presentation and Literature Analysis

Introducción: los ependimomas supratentoriales extraventriculares son una entidad sumamente infrecuente, solo 45 casos han sido reportados en la literatura. La mayoría de los ependimomas se localizan a nivel infratentorial e intraventricular, solo en un grupo pequeño de casos no presentan continuidad con el sistema ventricular. El objetivo de este trabajo es describir y presentar el caso de un tumor inusual, cuya importancia radica en la baja prevalencia de casos reportados en la literatura y en la particularidad del abordaje quirúrgico seleccionado. Descripción del caso: paciente de sexo masculino, de 16 años de edad, con diagnóstico de lesión ocupante de espacio sólida-quística, a nivel frontal izquierdo, entre el giro frontal superior y giro del cíngulo. Se optó por realizar un abordaje interhemisférico contralateral transfalcino, logrando la resección total de la lesión tumoral. Se obtuvo el diagnóstico histopatológico de ependimoma Grado II según clasificación de la OMS. Discusión: en base a la información analizada en los diferentes artículos, los hallazgos imagenológicos y anatomopatológicos del caso presentado coinciden con lo relatado en la literatura acerca de los ependimomas supratentoriales extraventricualres. Es imprescindible la utilización de técnicas de inmunohistoquímica para la correcta tipificación del tumor ya que las características del mismo son fácilmente confundibles con otras entidades y su correcta graduación tiene implicancias pronósticas y terapéuticas. Conclusión: los ependimomas supratentoriales extraventricualares son neoplasias sumamente inusuales. La resección quirúrgica es considerada el tratamiento de primera línea para mejorar el pronóstico y la sobrevida. El abordaje interhemisférico contralateral transfalcino nos permitió lograr la exéresis total de la lesión tumoral, favoreciéndonos un adecuado ángulo de trabajo y reduciendo así la transgresión del parénquima cerebral

ntroduction: extraventricular supratentorial ependymomas are an extremely rare entity, only 45 cases have been reported in the literature. Most ependymomas are located at the infratentorial and intraventricular level, only in a small group of cases don ́t present continuity with the ventricular system. The aim of this paper is to describe and to present the case of an unusual tumor, the importance lies in the low prevalence of cases reported in the literature and in the particularity of the selected surgical approach. Case description: a 16-year-old male patient with a diagnosis of a solid-cystic space-occupying lesion, at the left frontal level, between the superior frontal gyrus and the cingulate gyrus, measuring 40mm x 50mm x 60mm. A contralateral transfalcine interhemispheric approach was chosen, achieving total resection of the lesion. The histopathological diagnosis of Grade II ependymoma was obtained according to WHO. Discussion: based on the information analyzed in the different articles, the imaging and pathological findings of the case presented coincide with what is reported in the literature about supratentorial extraventricular ependymomas. The use of immunohistochemical techniques is essential for the correct typing of the tumor since its characteristics are easily confused with other entities and its correct graduation has prognostic and therapeutic implications Conclusion: extraventricular supratentorial ependymomas are extremely rare neoplasms. Surgical resection is considered the first-line treatment to improve prognosis and survival. The contralateral transfalcine interhemispheric approach allowed us to achieve a total resection of the lesion, favoring an adequate working angle and thus reducing the transgression of the brain parenchyma

Abordaje interhemisférico contralateral. Nota técnica / Contralateral interhemispheric approach. Technical note

El abordaje interhemisférico contralateral es una variante del abordaje interhemisférico transcalloso que permite optimizar el acceso a lesiones ubicadas en los ventrículos laterales o en sus paredes. La planificación del ángulo de entrada mediante neuronavegador nos permitió el manejo de un Cavernoma ubicado sobre el núcleo caudado e inmediato a la cápsula interna sin realizar callosotomía convencional ni comprometer las estructuras sensibles adyacentes.

Contralateral interhemispheric approach is a variant of the well-know interhemispheric transcallosal approach that allows to optimize the lateral wall ventricle lesions management. Neuronavigation planning allowed us to deal with a caudate nucleus cavernoma contiguous to internal capsule without conventional callosotomy and additional damage neither.

An anatomic study of superficial temporal artery to anterior cerebral artery bypass using ipsilateral parietal branch of superficial temporal artery as graft / 中华显微外科杂志

Objective Revascularization of the distal segment of the anterior cerebral artery (ACA) using extracranial donors requires long interposition grafts.A novel bypass procedure which uses the two main branches of the superficial temporal artery (STA) to reach the A3 segment of the anterior cerebral artery with a single skin incision was designed.Methods Ten cadaveric specimens were dissected through a single skin incision to harvest the frontal and parietal branches of the STA from June,2017 to September,2017.An anterior interhemispheric approach provided access to the middle internal frontal artery (MIFA).The parietal STA was used as an interposition graft between the frontal STA and MIFA.Lengths and calibers of the distal branches of STA and MIFA were measured at the anastomotic sites.All data was statistical analysis by t-test.Results The average caliber of MIFA was (1.4±0.2) mm,which matched the caliber of both frontal and parietal branches of STA.The mean distance for an end-to-side bypass from STA to MIFA was (144.5±7.4) mm and the average harvested donor-graft complex length was (203.1±27.9) mm.This bypass construct provided around 140％ donor graft length.Conclusion Using the parietal branch of the STA as an interposition graft enabled a successful tension-free STA-MIFA bypass.The advantages of this technique over existing approaches include sufficient graft length,caliber match and relative technical ease.

Pterional or Subfrontal Access for Proximal Vascular Control in Anterior Interhemispheric Approach for Ruptured Pericallosal Artery Aneurysms at Risk of Premature Rupture

OBJECTIVE: Cases of a ruptured pericallosal artery aneurysm with a high risk of intraoperative premature rupture and technical difficulties for proximal vascular control require a technique for the early and safe establishment of proximal vascular control. METHODS: A combined pterional or subfrontal approach exposes the bilateral A1 segments or the origin of the ipsilateral A2 segment of the anterior cerebral artery (ACA) for proximal vascular control. Proximal control far from the ruptured aneurysm facilitates tentative clipping of the rupture point of the aneurysm without a catastrophic premature rupture. The proximal control is then switched to the pericallosal artery just proximal to the aneurysm and its intermittent clipping facilitates complete aneurysm dissection and neck clipping. RESULTS: Three such cases are reported: a ruptured pericallosal artery aneurysm with a contained leak of the contrast from the proximal side of the aneurysm, a low-lying ruptured pericallosal artery aneurysm with irregularities on its proximal wall, and a multilobulated ruptured pericallosal artery aneurysm with the parasagittal bridging veins hindering surgical access to the proximal parent artery. In each case, the proposed combined pterional-interhemispheric or subfrontal-interhemispheric approach was successfully performed to establish proximal vascular control far from the ruptured aneurysm and facilitated aneurysm clipping via the interhemispheric approach. CONCLUSION: When using an anterior interhemispheric approach for a ruptured pericallosal artery aneurysm with a high risk of premature rupture, a pterional or subfrontal approach can be combined to establish early proximal vascular control at the bilateral A1 segments or the origin of the A2 segment.

Microsurgical removal of large neoplasms located in the suprasellar, back of sellar region and anterior part of third ventricle through bilateral frontobasal interhemispheric approach / 中华神经医学杂志

Objective To summarize the microsurgical techniques for removal of large neoplasms located in the suprasellar,back of sellar region and anterior part of third ventricle through bilateral frontobasal interhemispheric approach.Methods Fifty-six patients with large neoplasms located in the suprasellar,back of sellar region and anterior part of third ventricle,admitted to our hospital from January 2002 to January 2013 and performed removal via bilateral frontobasal interhemispheric approach; their clinical data and treatment efficacy were analyzed retrospectively.The microsurgical techniques were summarized,and the factors affecting the prognosis were analyzed.Results Total removal of the tumors was achieved in 49 patients (88％) and subtotal removal in 7 (12％).The pituitary stalk was reserved in 47 patients (84％),severed in 4 (7％),and unidentified in 5 (9％).The bilateral olfactory nerves were successfully preserved in 50 patients (89％) and unilateral severed in 6 (11％).Visual impairment was found in 41 patients before surgery,39 of them achieved postoperative visual improvement and 2 patients had no change during the follow-up at 6 months.In our series,there were no procedure-related mortalities and bacterial meningitis.Unilateral anosmia was detected on examination in 2 patients.Minimal frontal lobe contusion developed in 2 patients but resolved within 3 weeks.Cerebrospinal fluid leakage occurred in 1 patient,which was cured for 2 week.Transient diabetus insipidus developed in 25 patients but resolved within 1 month; permanent postoperative diabetes insipidus was present in 5 patients during the follow-up at 6 months.During the follow-up of 12 months,56 patients (100％) gained Glasgow outcome scale (GOS) scores of 5,only 4 (7％) patients with tumors resected partially had tumor relapse and received surgery again.Conclusions The bilateral frontobasal interhemispheric approach is appropriate for removing tumors located in the suprasellar,back of sellar region and anterior part of third ventricle.With sufficient exposure of lesion,the important anatomic structures such as the pituitary stalk,hypothalamic structure,perforating vessels,anterior communicating complex,the visual pathway,and the olfactory nerves could be preserved effectively.The surgery via this approach can increase total removal rate of the tumors,decrease the complications and achieve a good outcome.

Removal of 18 cases of tuberculum sellae meningiomas by anterior interhemispheric approach / 中国基层医药

Objective To summarize the surgery effect of removal of tuberculum sellae meningiomas by anterior interhemispheric approach.Methods The data of 18 cases of removal of tuberculum sellae meningiomas by anterior interhemispheric approach were analyzed retrospectively.Results Simpson grade Ⅰ resection was achieved in 5 cases;grade Ⅱ in 10 cases and grade Ⅲ in 3 cases.15 patients were followed up for 6 months to 7 years,3.1 years on average.6 patients recovered normal ability in work and life,6 patients' symptom was improved after sugery,3 patients' postoperative visual acuity remained unchanged,2 patients got the result of medium disability and 1 patient died.Conclusion Large tuberculum sellae meningiomas that grows anteriorly and superiorly can be well exposed through anterior interhemispheric approach,the amount of page pull is reduced,so the satisfactory sugical effect can be achieved.

Surgery on ruptured anterior communicating artery aneurysm via interhemispheric approach / 中华神经医学杂志

Objective To explore the efficacy of surgery on ruptured anterior communicating artery aneurysm via interhemispheric approach Methods An analysis and summary of the clinical data were performed in 23 patients with anterior communicating artery aneurysm, admitted to our hospital from January 2008 to August 2009. The clinical manifestations and surgical outcomes were analyzed to evaluate the significance of interhemispheric approach. Results Three aneurysms ruptured during the operation, and 8 aneurysms were excised after being clipped. All patients received CT scan 1 d after the operation and on the day the patients discharged to confirm that no hydrocephalus and brain tissue infarction appeared. All the patients were performed transcranial Doppler ultrasonography on the 3rd d of operation, indicating that 5 patients emerged cerebral angiospasm, and 2 of these 5 patients appeared frontal psychiatric symptoms and recovered 1 week later. No disability or death was noticed.Conclusion Interhemispheric approach enjoys its superiority in treating anterior communicating artery aneurysm: it can help to expose the anterior communicating artery complex and neck of the aneurysm,therefore, anterior communicating artery aneurysm can be clipped, and the interhemispheric hematoma can be cleaned up and the happening of post-operative vasospasm can be decreased.

Research of microsurgery removing sellar region tumor by interhemispheric approach / 肿瘤研究与临床

OI To research the new interhemispheric approach treatments of removing different large or huge sellar region tumor. Methods To remove 36 cases of different infiltrated-growth large or huge sellar region tumors by interhemisphefic approach microsurgery. Results In the 36 cases, total removal was achieved in 29, subtotal in 5 and most-partly in 2, and without any severe complications or death occured. 12 in 18 functional pituitary adcnoma were followed up, 10 cases got recovery on hormone level, and the level in 2 cases reduced ob ously. 2 cases recurred, both received γ-knife treatment. Conclusion The new interhemispheric approach surgery is important for large or huge invasive sellar region tumor.

Surgical Experience of the Ruptured Distal Anterior Cerebral Artery Aneurysms

OBJECTIVE: Distal anterior cerebral artery (DACA) aneurysms are fragile and known to have high risks for intraoperative premature rupture and a relatively high associated morbidity. To improve surgical outcomes of DACA aneurysms, we reviewed our surgical strategy and its results postoperatively. METHODS: A total of 845 patients with ruptured cerebral aneurysms were operated in our hospital from January 1991 to December 2005. Twenty-three of 845 patients had ruptured DACA aneurysms which were operated on according to our surgical strategy. Our surgical strategy was as follows; early surgery, appropriate releasing of CSF, appropriate surgical approach, using neuronavigating system, securing the bridging veins, using temporary clipping and/or tentative clipping, meticulous manipulation of aneurysm, and using micro-Doppler flow probe. Twenty of 23 patients who had complete medical records were studied retrospectively. We observed the postoperative radiographic findings and checked Glasgow Outcome Scale score sixth months after the operation. RESULTS: Nineteen DACA aneurysms were clipped through a unilateral interhemispheric approach and one DACA aneurysm was clipped through a pterional approach. Postoperative radiographic findings revealed complete clipping of aneurysmal neck without stenosis or occlusion of parent arteries. In two patients, a residual neck of aneurysm was visualized. Seventeen patients showed good recovery, one patient resulted in moderate disability, while 2 patients died. CONCLUSION: With our surgical strategy it was possible to achieve acceptable surgical morbidity and mortality rates in patients with DACA aneurysms. Appropriate use of tentative clipping, temporary clipping and neuro-navigating systems can give great help for safe approach and clipping of DACA aneurysm.

Clinical Assessment of Surgical Approaches for the High Positioned Anterior Communicating Artery Aneurysms / 대한뇌혈관외과학회지

OBJECTIVE: The aim of this study was to determine the safe distance from anterior clinoid process (ACP) when the frontotemporal approach (FTA) was used for clipping of anterior communicating artery aneurysms (Acom ANs) and eventually to confirm whether the interhemispheric approach (IHA) was more effective in a certain Acom ANs. We defined the high positioned (HP) Acom AN as more than 18mm and the usual positioned (UP) Acom AN as less than 18 mm above the ACP on the lateral view of the conventional carotid artery angiogram. METHODS: Two hundred thirty four cases of Acom ANs were treated surgically either FTA or IHA by the same operator during last 14 years. The UP Acom ANs were 187 cases and the HP Acom ANs were 47 cases. We analysed the postoperative status of not only clinical conditions but also radiological findings in all cases retrospectively. RESULTS: FTA or IHA was chosen in 187 (182/5) cases of UP Acom ANs. But FTA or IHA was performed in 47 (21/26) cases of HP Acom ANs. The prognosis was better in UP Acom ANs than HP Acom ANs when FTA was chosen. But if the AN located more than 18 mm above the ACP, so called the HP Acom AN, IHA was made better prognosis than FTA. CONCLUSION: The safe distance from ACP to AN neck was lower than 18mm when FTA was chosen for the Acom ANs. IHA showed better results in the cases of AN neck higher than 18 mm from the ACP, ANs associated with a significant hematoma at the frontal lobe, moyamoya like diseases on the middle cerebral artery territory, another ANs at the distal anterior cerebral artery or aneurysmal projection of superoposterior type.

Interhemispheric Approach for Intracranial Aneurysms / 대한뇌혈관학회지

The author describes the basic and standard operative method of interhemispheric(IH) approach for intracranial aneurysms especially aneurysm in anterior cerebral artery territory.Though most neurosurgeons prefer to pterional approach for anterior communicating artery aneurysm, some neurosurgeons select IH approach routinely for this aneurysm because of least brain retraction and excellent anatomical orientation with this approach. But IH approach should be chosen for distal anterior cerebral artery aneurysms and certain cases of anterior communicating artery aneurysms such as high positioned aneurysm or aneurysm with significant hematoma at frontal lobe. interhemispheric approach.

Surgical Treatment of Distal Anterior Cerebral Artery Aneurysms

The incidence of the distal anterior cerebral artery(DACA) aneurysm comprises about 2-6% of all intracerebral aneurysms. Because of the low incidence, unique anatomies of the distal anterior cerebral arteries and some technical difficulties in surgery, these aneurysms present such challenge to neurosurgeons. Presently, early surgery using interhemispheric approach is preferred. The auhtors experienced six patients with DACA aneurysms in 130 consecutive intracerebral aneurysms surgically treated between May. 1994 and Dec. 1997. The patients received operations within five days from the ictus, except one patient because of symptomatic vasospasm. The surgical approaches were all unilateral interhemispheric approaches. During the operations, infusion of large amount of mannitol and CSF volume removal were applied, although there were few difficulties in the interhemispheric dissections, the outcomes of the patients were excellent in three, good in three. The authors suggest that early operative interventions using unilateral interhemispheric approach without generous craniotomy can improve the outcomes of the patients with ruptured DACA aneurysm.

Clinical Analysis of the Sellar and Parasellar Lesions using the Bifrontal Basal Interhemispheric Approach

The authors describe the use of the bifrontal basal interhemispheric approach in the clinical analysis of sellar and parasellar lesions. This approach is a more basal modification of the conventional anterior interhemispheric approach extended to the nasion, and most bridging veins are preserved. After dividing the falx at its anterior end, frontal lobes are retracted bilaterally and olfactory nerves are dissected from the frontal lobe to the olfactory trigon. This approach was used ffor operationsinvolving ten patients : in seven, in whom a parasellar tumor had been detected, gross or near-total removal of this large mass was achieved, and three, with aneurysm of the anterior communicating artery aneurysm underwent clipping and aneurysmorrhapy. In one patient with a huge retrochiasmatic tumor, division of the anterior communicating artery was performed. After cutting the anterior communicating artery, no side effects were detected. Visual improvement and preservation of the pituitary stalk was achieved in 86% and 57% of cases, respectively. This approach, progressing from the midline, provided better orientation of the mass and its surrounding structures such as the hypothalamus, optic chiasm, pituitary stalk and perforating arteries. The authors discuss the indications, advantages and disadvantages of the bifrontal basal interhemispheric approach, and include a review of the literature.

Ruptured Aneurysm of Azygos Anterior Cerebral Artery: Two Case Report

We present our recent experience of two rare cases of ruptured aneurysm of the azygos anterior cerebral together with a review of the literature. On admission, the patients were in clinical Grade 4 of Hunt and Hess classification. Cerebral angiograms showed a giant saccular aneurysm(25x10x10mm in size) on the distal bifurcation portion of the azygos anterior cerebral artery in one patient, and a medium sized saccular aneurysm(7x9mm in size) on the proximal portion of azygos anterior cerebral artery in the other patient. Both the patients underwent a successful, direct clipping of the aneurysmal neck through an interhemispheric and left parietal approach, respectively. One month later after the operations, one patient showed mutism and spastic paraparesis and the other remained in a drowsy mental status with left side hemiparesis. The pre-operative neurologic status and further neurologic deficits attributed to cerebral vasospasm are thought to be the most important prognostic factors in deciding the post-operative outcome in these patients.

Four Cases of Surgically Managed Distal Anterior Cerebral Artery Aneurysm

A series of 4 patients with aneurysm of distal anterior cerebral artery(DACA), operated with microtechniques, is reviewed. Because the incidence of aneurysms in this location was only 2 to 4% of that of total aneurysm, little expericences on surgical management of this aneurysm have been reported. An aneurysm in this location is difficult to approach surgically because of their multiplicity, characteristically broad and sclerotic base, with small subarachnoid space in the interhemispheric fissure. We surgically treated DACA aneurysms of 4 cases through the interhemispheric approach via the unilateral frontal paramedian craniotomy on the nondominant side.

Ligation of Anterior Superrior Sagittal Sinus in Approaching Distal Anterior Cerebral Artery Aneurysm

Interhemispheric approach has been accepted as a standard method approaching distal anterioir cerebral artery(DACA) aneurysm. In the approach, most authors use the surgical method retracting the superior sagittal sinus(SSS) after dural reflection. However, it results in limited surgical space and makes the surgical procedure difficult technically. To overcome the limitation, we tried to ligate and cut SSS in 13 patients out of 23 patients of DACA aneurysm from Mar. 1983 to Feb. 1993. Out of total 583 intracranial aneurysms operated on in that period, the proportion of DACA aneurysm was 3.95%. Mean age was 52.7 years ranging from 32 to 66 years. The sex ration was 7:16, showing female predominancy. As presenting symptoms, twenty two patients had subrachnoid hemorrhage and one patient had a third nerve palsy due to an unruptured posterior communicating artery aneurysm. On admission, 4 patients(17.4%) were in grade I, 10(43.5%) in grade II, 6(26.1%) in grade III, 3(13%) in grade IV according to the Hunt and Hess grading system. In 18 patients(78.3%), aneurysms were located at bifurcation of pericallosal and callosomarginal artery and in 5(21.7%) at bifurcation of frontopolar and pericallosal artery. Associated vascular anomalies were A1 hypoplasia(2 cases), multiple aneurysms(5 cases), fenestration of anterior cerebral(1 case) and arteriovenous malformation(1 case). Thirteen cases were operated on with ligation of the SSS and 10 without ligation. Overall surgical outcomes scored by Glasgow outcome scale were : 11 patients(47.8%) in Grade I, 6(26.1%) in Grade II, 2(8.7%) in Grade III, 4(17.4%) in Grade V. The outcomes in ligation group were : 8 patients(61.5%) in Grade I, 4(30.8%) in Grade II, 1(7.7%) in Grade III, and no death. The outcomes in non-ligation group were : 4 patients(40%) in Grade I, 1(10%) in Grade II, 1(10%) in Grade III, and 4(40%) in Grade V. These results showed that the patients operated on with ligation of SSS had more favorable outcomes than the patients without ligation. It seems that the SSS in the interhemispheric approach might provide several advantages and better operative outcome over the conventional method.

Microsurgical Treatment of Distal Anterior Cerebral Artery Aneurysm

Between Jan. 1983 and Dec. 1990, 17 Patients with distal anterior cerebral artery(DACA) aneurysms were admitted to our institute and underwent microsurgical neck clipping of their aneurysms. This group comprised 3.7% of the 437 aneurysms managed surgically during this period. There were 11 females and 6 males. The mean age was 48.5 years. Most of DACA aneurysms were located at the genu portion of the anterior cerebral artery. Three cases were at the proximal protion of A2 close to the anterior communicating artery. Two cases were at the dista pericallosal artery and distal callosomarginal artery. Eight patients had additional vascular anomalies documented by angiography such as multiple aneurysms, azygos DACA and duplication of DACA. Direct neck clipping was possible in all cases through the interhemispheric approach or the frontotemporal approach according to the location. For the interhemispheric apporach preoperative evaluation of the exact location and direction of the aneurysms on the angiogram was important for operative planning. The surgical outcome was good or excellent without any neurological deficits in 17 of the cases. Operative management, clinical features and incidence of vascular anomalies associated with DACA aneurysms are discussed.

Surgical Management of the Distal Anterior Cerebral Artery Aneurysms

The authors described different type of aneurysms in the distal anterior cerebral artery(DACA), which is difficult to approach surgically. there are anomalies of distal anterior cerebral artery in about one fourth and narrow space, which made more careful surgical dissection. We experienced 7 cases of DACA aneurysm, 6 cases of which were treated surgically through the interhemispheric approach via the unilateral frontal paramedian craniotomy on the non-dominant side. Surgical results were anatomical complexities, modern microsurgical technique aided by microscope make the approach more exactly and safely.