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Results for “Temporal Lobe Resection”

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PubMed2001

Investigation of extra-temporal epilepsy.

Medically intractable epilepsy of extra-temporal origin can represent a difficult therapeutic challenge. Our Epilepsy Service has managed these patients using standard investigative methods as well as ictal SPECT and intracranial electrode recording. In the present series of patients, image-guided surgery was used for all electrode implantation and resective surgery. Seizure localization and successful resection were achieved in 70-80% of 42 patients with follow-up of at least one year. Normal MRI and previous failed intracranial investigation were not associated with poorer outcome.

Diagnostic Imaging↗

PubMed1998

Interictal seizure resections show two configurations of endothelial Glut1 glucose transporter in the human blood-brain barrier.

Immunogold electron microscopy was used to analyze and quantify the Glut1 glucose transporter in brain tissue from five patients undergoing surgery for treatment of seizures. Samples were prepared from two different regions of each resection: (1) the most actively spiking epileptogenic site, and (2) the least actively spiking region, as indicated by intraoperative EEG monitoring. Two configurations of endothelial cell Glut1 were observed. About one half of the capillary profiles examined displayed abundant Glut1 immunoreactivity on both luminal and abluminal endothelial membranes. In the remainder of the profiles, reduced Glut1 labeling was seen, but adjacent erythrocyte membranes remained highly Glut1 immunoreactive, suggesting that reduced endothelial Glut1 reactivity was not attributable to method artifacts. Immunogold studies using antisera to human glial fibrillary acidic protein and human serum albumin demonstrated increased quantities of these two epitopes in the extravascular regions in which more EEG spiking activity had been demonstrated. These observations were consistent with the hypotheses that capillary integrity was more compromised, and gliosis was quantitatively increased, in the more actively spiking region of the resection. Altered glucose transporter activity in the blood-brain barrier was characterized by a bimodal Glut1 distribution in which the smaller (type B) endothelial cells displayed low Glut1 immunoreactivity, whereas adjacent (and even contiguous) larger (type A) endothelial cells showed 5- to 10-fold greater expression of membrane Glut1 transporter protein. Because this transporter facilitates glucose entry to the brain, small pericapillary volumes of brain tissue may have quite different concentrations of glucose. We hypothesize that in complex partial seizures and other forms of brain insult, an alteration of blood-brain barrier Glut1 glucose transporter activity is indicated by the appearance of these two subpopulations of endothelial cells. In comparison with previous studies of human brain capillaries in hemangioblastoma and brain injury, endothelial Glut1 density was apparently reduced (interictally) in affected temporal lobes of patients with complex partial seizures.

Biological Transport↗

PubMed1993

Surgical treatment of epilepsy due to cortical dysplasia: clinical and EEG findings.

Seventeen patients with cortical dysplasia who had surgical resection for medically intractable partial epilepsy were studied. Compared with two groups of surgically treated patients with intractable epilepsy due to tumour (n = 20) and mesial temporal sclerosis (n = 40), patients with cortical dysplasia showed significantly more frequent extratemporal lesions, more frequent non-epileptiform EEG abnormalities and less favourable surgical outcome for seizure control. Patients with cortical dysplasia were younger at onset of seizures and had a lower detection rate of CT abnormalities compared with the tumour group, and lower IQ compared with the mesial temporal sclerosis group. MRI was abnormal in five of seven patients. Six patients became seizure-free or almost seizure-free but eight did not experience relief of seizures. Surgical outcome related to the extent of pathology but not to the histological abnormality. Lesions outside the temporal and frontal lobes were correlated with poor surgical outcome, as were generalised interictal EEG abnormalities, which may reflect extensive or multiple lesions. Ictal intracranial recordings were not useful for presurgical evaluation of cortical dysplasia.

Adolescent↗

PubMed1992

Results of anterior temporal lobectomy that spares the amygdala in patients with complex partial seizures.

In December, 1980, the authors modified their anterior temporal lobectomies to exclude the amygdala from resection, a decision influenced by the dearth of pathology in the amygdala compared to the hippocampus. Furthermore, it had never been demonstrated that a good result was contingent upon including the amygdala per se in the lobectomy. Fifty-five (79%) of 70 patients in whom the amygdala was not resected were benefited by surgery. This result is similar to that achieved in series of anterior temporal lobectomies that include the amygdala in the resection. The results take on a special significance when considered together with those of amygdala-hippocampectomy which has been effective for controlling complex partial seizures of temporal mesiobasal origin (the region of the hippocampus, parahippocampal gyrus, and amygdala). A survey of the combined results strongly suggests that the anterior hippocampus and/or associated entorhinal cortex may be all that need be removed to control complex partial seizures caused by a temporal mesiobasal focus.

Adolescent↗

PubMed1998

Prediction of verbal memory loss in individuals after anterior temporal lobectomy.

PURPOSE: Decreased memory function represents the area of greatest neuropsychological morbidity after anterior temporal lobectomy (ATL), particularly for left ATL candidates. We wished to identify easily derived demographic and neuropsychological predictors of risk of pre- to postoperative memory decline using only information available preoperatively. METHODS: We assessed decline in memory as measured by the California Verbal Learning Test (CVLT) by deriving multiple regression equations using the following measures as independent variables: age at onset, chronological age at time of surgery, sex, Full Scale IQ (FSIQ), level of education, and preoperative memory scores. In all, 203 patients (93 males, 110 females), undergoing ATL (107 left, 96 right) with preoperative and 6-month postoperative testing, were examined. RESULTS: The combination of age, FSIQ, sex, side of surgery and preoperative score was highly predictive (p-values < 0.0001) of postoperative memory scores. Higher postoperative scores were associated with higher preoperative score, younger chronological age, higher FSIQ, female sex, and right side of resection. Reliable change index (RCI) values were used to estimate meaningful decline on the total score across five trials. Logistic regression analysis showed preoperative score and age to be predictors of RCI decline for left-sided resections. Sensitivity of decline (> or =90th centile RCI) prediction was 56%, and specificity was 95%. Validation in 30 patients from a separate population of patients undergoing left ATL produced similar figures. CONCLUSIONS: The derived regression equations can accurately predict verbal memory decline on a list-learning task in approximately 50% of individual patients undergoing ATL, and false-positive prediction errors are very rare.

Age Factors↗

PubMed2005

Seizure outcome after epilepsy surgery in patients with normal preoperative MRI.

OBJECTIVE: To determine outcome after epilepsy surgery in patients with normal preoperative magnetic resonance imaging (MRI). METHODS: 24 adult and paediatric patients with normal preoperative MRIs were studied. They underwent epilepsy surgery between 1994 and 2001 and had at least one year of follow up. RESULTS: At the most recent follow up, nine patients (37%) were seizure-free and 18 (75%) had at least a 90% reduction in seizure frequency with weekly or monthly seizures. Seizure freedom was not significantly different after resections in frontal (5/9) or temporal regions (4/13) (p = 0.24, Fisher's exact test), or among patients with or without localising features on EEG, PET, or ictal SPECT. Subdural grids, used in 15 of 24 patients, helped tailor resections but were not associated with differences in outcome. Histopathology showed cortical dysplasia in 10 patients (42%), non-specific findings in 13 (54%), and hippocampal sclerosis in one (4%). Cortical dysplasia was seen in seven patients with frontal resection (78%) and non-specific findings in nine (69%) with temporal resection. Seizure outcome did not differ on the basis of location of resection or histopathology. CONCLUSIONS: While these results were less favourable than expected for patients with focal epileptogenic lesions seen on MRI, they represented worthwhile improvement for this patient population with high preoperative seizure burden. In this highly selected group, no single test or combination of tests further predicted postoperative seizure outcome.

Adolescent↗

PubMed1998

Plasma cell granuloma extending from the extracranial to the intracranial space associated with Epstein-Barr virus infection.

A 70-year-old male presented with a plasma cell granuloma extending from the extracranial to the intracranial space. Findings of preoperative magnetic resonance imaging and intraoperative observation indicated that the lesion extended from the temporal muscle to the subarachnoid space, penetrating the frontal bone. The subarachnoid lesion was composed of neutrophils indicating the presence of acute or subacute inflammation. The final diagnosis of the resected tumor was plasma cell granuloma. High levels of antibodies against Epstein-Barr (EB) virus in the cerebrospinal fluid and the immunohistochemical demonstration of EB nuclear antigens in the plasma cell granuloma suggested that EB virus infection was associated with the development of plasma cell granuloma in this patient.

Aged↗

PubMed1997

Intraoperative magnetic resonance imaging to update interactive navigation in neurosurgery: method and preliminary experience.

We report on the first successful intraoperative update of interactive image guidance based on an intraoperatively acquired magnetic resonance imaging (MRI) date set. To date, intraoperative imaging methods such as ultrasound, computerized tomography (CT), or MRI have not been successfully used to update interactive navigation. We developed a method of imaging patients intraoperatively with the surgical field exposed in an MRI scanner (Magnetom Open; Siemens Corp., Erlangen, Germany). In 12 patients, intraoperatively acquired 3D data sets were used for successful recalibration of neuronavigation, accounting for any anatomical changes caused by surgical manipulations. The MKM Microscope (Zeiss Corp., Oberkochen, Germany) was used as navigational system. With implantable fiducial markers, an accuracy of 0.84 +/- 0.4 mm for intraoperative reregistration was achieved. Residual tumor detected on MRI was consequently resected using navigation with the intraoperative data. No adverse effects were observed from intraoperative imaging or the use of navigation with intraoperative images, demonstrating the feasibility of recalibrating navigation with intraoperative MRI.

Adult↗

PubMed1975

Dichotic pursuit auditory tracking after anterior temporal lobectomy.

Patients with left or right anterior temporal lobectomies show severe deficits on the ear contralateral to the lesion in responding to dichotic speech stimuli. One patient with a left and one with a right anterior temporal lobectomy were tested on a dichotic pursuit auditory tracking task. There were no severe performance deficits that would have indicated difficulty in processing either pure tone stimulus; The resected areas were apparently not necessary for relatively efficient processing of these simple nonspeech stimuli, either because other parts of the damaged hemisphere were sufficient for task performance or because ipsilateral auditory transmission pathways can be used in this task. Both patients showed a speech-related right ear advantage for the jaw generated tone but not for the hand generated tone.

Adult↗

PubMed2001

Medically intractable, localization-related epilepsy with normal MRI: presurgical evaluation and surgical outcome in 43 patients.

PURPOSE: High-resolution magnetic resonance imaging (MRI) plays a crucial role in the presurgical evaluation of patients with medically refractory partial epilepsy. Although MRI detects a morphologic abnormality as the cause of the epilepsy in the majority of patients, some patients have a normal MRI. This study was undertaken to explore the hypothesis that in patients with normal MRI, invasive monitoring can lead to localization of the seizure-onset zone and successful epilepsy surgery. METHODS: A series of 115 patients with partial epilepsy who had undergone intracranial electrode evaluation (subdural strip, subdural grid, and/or depth electrodes) between February 1992 and February 1999 was analyzed retrospectively. Of these, 43 patients (37%) had a normal MRI. RESULTS: Invasive monitoring detected a focal seizure onset in 25 (58%) patients, multifocal seizure origin in 12 (28%) patients, and in six patients, no focal seizure origin was found. Of the 25 patients with a focal seizure origin, cortical resection was performed in 24, of whom 20 (83%) had a good surgical outcome with respect to seizure control. Six of the 12 patients with multifocal seizure origin underwent other forms of epilepsy surgery (palliative cortical resection in two, anterior callosotomy in two, and vagal nerve stimulator placement in two). CONCLUSIONS: Successful epilepsy surgery is possible in patients with normal MRIs, but appropriate presurgical evaluations are necessary. In patients with evidence of multifocal seizure origin during noninvasive evaluation, invasive monitoring should generally be avoided.

Adolescent↗

PubMed1983

Cystic cerebral astrocytomas in infancy and childhood: long-term results.

24 cases of cystic cerebral astrocytoma represent 11% of 217 supratentorial tumors of the pediatric age group operated. Both macro- and microscopically, such tumors resembled in most cases the well-known cerebellar astrocytoma, presenting as a large cyst with a mural nodule with the pattern of a pilocytic astrocytoma (i.e. spongioblastoma of the German school). The preferential site of incidence was the temporal lobe and the age peaks were of 7 and 16 years without sex prevalence. The surgical technique consisted in the extirpation of the mural nodule, preceded by emptying the cyst, followed by opening the contiguous ventricular wall. The extirpation was partial in one-third of the cases of whom the minority underwent radiotherapy. 1 patient died after the operation while 2 others died from tumor recurrence after 3 and 4 years, respectively, both being mixed tumors (oligoastrocytoma) that were irradiated postoperatively. The follow-up ranged from 10 to 29 years in 70% of the cases. The long-term functional results of the available 17 patients are as follows: good (perfectly well), 12 cases (70%); fair (minor troubles), 5 cases (30%). 3 of the 5 cases with a fair result all had a partial resection.

Adolescent↗

PubMed2003

Complete surgical resection in children with low-grade astrocytomas after neoadjuvant chemotherapy.

INTRODUCTION: Low-grade astrocytomas constitute the majority of pediatric central nervous system neoplasms. Gross total resection is desirable as the initial therapeutic approach and is curative in most cases. In the past, radiation therapy was often recommended for patients in whom complete resection was not achieved, although there are special concerns about secondary malignancy and cognitive impairment. There has been increasing interest in the use of chemotherapy to treat these tumors, but appropriate indications still need to be defined. CASE REPORTS: The use of neoadjuvant chemotherapy to ease surgical resection in two children with inoperable pilocytic astrocytomas who presented with extrinsic compression of mesencephalic structures is described. DISCUSSION: This paper also emphasizes and discusses the therapeutic approach for very selected cases of low-grade gliomas in children presenting with inoperable giant lesions, in whom the use of chemotherapy may be considered initially.

Astrocytoma↗

PubMed1988

Mechanisms of mania after brain injury. 12 case reports and review of the literature.

Twelve patients who developed mania after a brain lesion are reported. Ages ranged from 20 to 83 years. Five patients had brain tumors (three frontal meningiomas, one temporal meningioma, and one temporal astrocytoma), four patients had stroke lesions (one frontal, one temporal, and two thalamocapsular), two patients had a traumatic frontal closed head injury, and one patient had a pituitary adenoma resection. Although seven patients had lesions restricted to the right hemisphere, four had bilateral or midline damage and one had a left hemisphere lesion. Damage to structures functionally connected to the obitofrontal cortex, mainly in the right hemisphere, seems to be associated with secondary mania. The possible roles of monoaminergic, genetic, and perinatal factors in the pathogenesis of secondary mania are discussed.

Adult↗

PubMed2005

[Microsurgical treatment of nonmeningeal tumors of the cavernous sinus].

OBJECTIVE: To analyze the differential diagnosis of and effectiveness of surgical treatment on nonmeningeal tumors of cavernous sinus. METHODS: The clinical data, including clinical manifestations, diagnosis and differential diagnosis, operative procedure, and treatment results of 67 cases of nonmeningeal tumors of cavernous sinus, 32 males and 35 females, aged 41 +/- 16, who underwent microsurgical treatment were analyzed respectively. RESULTS: The main clinical presentation included cranial nerve paralysis (47 cases, 70.1%), neuroendocrine symptoms (11 cases, 16.4%), eye pain (9 cases, 13.6%), proptosis (7 cases, 10.6%), limb weakness (5 cases, 7.5%), headache, dizziness, lethargy, and temporal lobe epilepsy (4 cases each), and epistaxis (1 case). All patients had CT and/or MRI scanning before operation. Twenty-six patients had DSA examination and balloon occlusion test (BOT). All patients underwent orbito-zygomatico-pterional craniotomy. Twenty cases were operated on via intradural approach, 33 cases via epidural approach, and 14 cases via epidural/intradural combination approach most of which suffered from invasive pituitary adenoma and dumbbell type trigeminal neurinoma. Pathological examination revealed that hemangioma (24 cases), trigeminal schwannoma (18 cases), and invasive pituitary adenomas (11 cases) comprised the majority of tumors; the remaining tumor types were chordoma, chondroma, chondromyosarcoma, chondrofibroma, dermoid tumor, malignant nerve sheath tumor, metastatic tumor, and lymphoma. In the intradural approach group, total tumor removal was achieved in 8 cases (40%), and 7 (35%) cases and 5 (25%) cases had subtotal and partial resection respectively. In the epidural approach group, 27 cases (81.8%) had total tumor removal, while 1 case (3.0%) had subtotal and 5 cases had partial excision of the tumor. In the epiduro-transdural approach group 10 cases (71.4%) achieved total resection and 4 cases (28.6%) had subtotal resection. Postoperative follow-up lasting 6 months to 10 years showed that the pre-operative central nervous system symptoms recovered in 39 cases (58.2%). The aggressive or new symptoms mainly included paralysis of oculomotor nerve (13 cases, 19.4%), trigeminal nerve (9 cases, 13.4%), and abduct nerve (9 cases, 13.4%). CONCLUSION: Depending on pathologic type and growth pattern of the tumor, extended middle skull base epidural or epidural-transdural approach is selected. Such techniques can offer satisfactory outcome, protecting the cranial nerve functions and removing the tumor to the maximum extent.

Adolescent↗

PubMedDate not supplied

[Awake craniotomy and brain mapping for eloquent cortex in patients with supratentorial tumors: a preliminary report].

Malignant brain tumours are incurable at present. Since none of the hitherto used treatment methods allows to significantly extend these patients' survival time, the basic aim is to improve their quality of life. Intraoperative brain mapping seems to be an approach enabling to minimize the risk of irreversible damages to functionally important structures of the brain. In the Department of Neurosurgery of the Medical University of Łódź awake craniotomy with stimulation of eloquent cortex was attempted from May 1999 to July 2000 in 13 patients aged 16 to 77 years. In two patients the attempt of intraoperative awakening was unsuccessful. In 8 out of the 11 awakened patients intraoperative brain mapping had a significant effect on the course of surgery (i.e. on the resection magnitude and "safe corridor"). Out of six patients with tumors situated in the neighbourhood of motor cortex--one developed a severe and permanent paresis of the upper limb. On the grounds of the literature and the authors' own experience an algorithm of awake craniotomy and intraoperative brain mapping was worked out.

Adolescent↗

PubMed2001

Surgical resection for intractable epilepsy in "double cortex" syndrome yields inadequate results.

PURPOSE: To analyze the results of surgical treatment of intractable epilepsy in patients with subcortical band heterotopia, or double cortex syndrome, a diffuse neuronal migration disorder. METHODS: We studied eight patients (five women) with double cortex syndrome and intractable epilepsy. All had a comprehensive presurgical evaluation including prolonged video-EEG recordings and magnetic resonance imaging (MRI). RESULTS: All patients had partial seizures, with secondary generalization in six of them. Neurologic examination was normal in all. Three were of normal intelligence, and five were mildly retarded. Six patients underwent invasive EEG recordings, three of them with subdural grids and three with stereotactic implanted depth electrodes (SEEG). Although EEG recordings showed multilobar epileptic abnormalities in most patients, regional or focal seizure onset was recorded in all. MRI showed bilateral subcortical band heterotopia, asymmetric in thickness in three. An additional area of cortical thickening in the left frontal lobe was found in one patient. Surgical procedures included multiple subpial transections in two patients, frontal lesionectomy in one, temporal lobectomy with amygdalohippocampectomy in five, and an additional anterior callosotomy in one. Five patients had no significant improvement, two had some improvement, and one was greatly improved. CONCLUSION: Our results do not support focal surgical removal of epileptogenic tissue in patients with double cortex syndrome, even in the presence of a relatively localized epileptogenic area.

Adolescent↗

PubMed2003

Ictal SPECT in children with epilepsy: comparison with intracranial EEG and relation to postsurgical outcome.

In order to validate the ability of ictal single photon emission computed tomography (SPECT) to localize the epileptogenic zone (EZ) in children, we compared in 20 patients aged from 10 months to 17 years (mean 6.5 years) the topography of the area of increased ictal perfusion (IPA), determined on the basis of ictal minus interictal scan values, with that of the EZ determined by intracranial EEG recordings and assessed its relationship with the postsurgical outcome. Eighteen patients had symptomatic epilepsy and 10 had extratemporal epilepsy. All patients except one had an ictal injection (mean time lag from clinical seizure onset was 18 s). Ictal and interictal SPECT images were successively co-registered, normalized, subtracted, smoothed and superimposed on MRI. All patients with ictal injection exhibited one or several IPAs. The topography of the 'highest' IPA, i.e. the maximal cerebral blood flow (CBF) change between ictal and interictal SPECT, significantly colocalized with the site of onset of the discharge, and that of the lower IPAs with that of the area of propagation (P < 0.0001). At a threshold of 30% of the maximal CBF change, the IPAs detected the onset of the discharge with a sensitivity of 0.80 and a specificity of 0.70. The highest IPA localized the EZ in 12 out of 15 patients. In the three others it missed the EZ and showed the area of propagation because of rapid seizure propagation or of infraclinical seizure onset. Among the patients with favourable surgery outcome, the highest IPA colocalized with the resected area in 70% of cases. Ictal SPECT could therefore plays an important role as a non-invasive presurgical method of investigation by optimizing the placement of intracranial electrodes, thus improving the postsurgery outcome of paediatric partial epilepsy.

Adolescent↗

PubMed1994

Gangliogliomas: clinical, radiological, and histopathological findings in 51 patients.

Clinical, radiological, and histopathological features of 51 surgically treated gangliogliomas were evaluated retrospectively. The most common presenting symptoms were epileptic seizures (47 patients (92%)). Focal neurological deficits occurred in 8% of the patients. The duration of symptoms at the time of operation ranged from three months to 45 years, mean 11 years. The temporal lobe was affected in 43 patients (84%), the frontal lobe in five patients (10%), and the occipital lobe in one patient (2%). Two of the tumours (4%) were localised infratentorially. On MRI, solid tumour parts usually showed a pronounced signal increase on proton density images and a less pronounced signal increase on T2 weighted images, whereas solid components were mainly isointense on T1 weighted images. Contrast enhancement was noted in 16 of 36 patients (44%). Cystic tumour parts were found in 23 of 40 patients (57%), all characterised by signal increase on T2 weighted images and decreased T1 signals. Signal deviation of cystic tumour parts on proton density images was variable. Computed tomography was performed in 17 patients and showed hypodense lesions in 10 (59%), and calcifications in seven (41%) cases. Surgery included complete tumour removal in 44 patients (86%) and partial resection in seven (14%). In six patients (12%) there were transient postoperative complications. One patient (2%) died postoperatively due to pulmonary embolism. Histopathological examination of the surgical specimens showed low grade gangliogliomas in 49 cases (96%) and anaplastic gangliogliomas in two (4%). Control MRI of 31 patients with a mean follow up period of 16 months was uneventful in all but one case of an anaplastic ganglioglioma. In all patients in whom the ganglioglioma was associated with medically intractable seizures the operation resulted in complete relief of seizures or a noticeable improvement of the epilepsy.

Adolescent↗