Publications by authors named "Cicek Bayindir"

16 Publications

  • Page 1 of 1

Computerized Tomography-Guided Stereotactic Biopsy of Intracranial Lesions: Report of 500 Consecutive Cases.

Turk Neurosurg 2017 ;27(3):395-400

Sisli Hamidiye Etfal Research and Training Hospital, Clinic of Neurosurgery, Istanbul, Turkey.

Aim: Computed tomography (CT)-guided stereotactic brain biopsy has been performed in our clinic since March 1998. In this prospective study, we examined the patient data undergoing stereotactic biopsy and the results of biopsies in 500 consecutive patients.

Material And Methods: Between the dates of March 1998 and January 2015, CT-guided stereotactic biopsies were performed by using the Leksell stereotactic frame system (Elekta Instruments EU, Sweden) in 500 patients. A total of 512 procedures were performed in patients consisting of 184 females (36.8%) and 316 males (63.2%), ages ranging from 3 to 81 years (mean 50.40±16.67).

Results: Conclusive histopathological diagnosis was not achieved in 17(3.3%) of 512 procedures. Of the others, 173 (33.8%) were high-grade gliomas, 103 (20.1%) were low-grade gliomas, 36 (7%) were malignant lymphomas, 34 (6.6%) were other types of brain tumors, 82 (16%) were metastasis and 67 (13.1%) were non-tumoral lesions. Complications were occurred in ten cases: 3 tumoral bleedings, 2 hypertensive cerebral hematomas, 2 peroperative convulsions, 1 epidural hematoma, 1 myocardial infarction and 1 brain edema. The patients who developed myocardial infarction and hypertensive thalamic hematoma died. The mortality was 0.4% and morbidity was 1.6% in 512 procedures.

Conclusion: CT-guided stereotactic biopsy is a reliable and a safe procedure in cases with intracranial lesions when histopathological diagnosis is required for the appropriate treatment.
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http://dx.doi.org/10.5137/1019-5149.JTN.16280-15.1DOI Listing
December 2017

Effects of Ginkgo biloba extract on spinal cord ischemia-reperfusion injury in rats.

Ann Vasc Surg 2014 Jul 20;28(5):1296-305. Epub 2014 Feb 20.

Department of Cardiovascular Surgery, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey.

Background: We aimed to assess the biochemical and histopathologic effects of Ginkgo biloba extract (EGb) in an ischemia-reperfusion (IR) model of spinal cord ischemia induced by cross-clamping of the infrarenal abdominal aorta.

Methods: A total of 24 Sprague-Dawley rats were divided into 3 groups as group 1: control (sham laparotomy), group 2: IR, and group 3: IR+EGb treatment (IR+T) group. All subjects were euthanized 2 days postsurgery and their spinal cords were removed. Tissue malondialdehyde, superoxide dismutase, glutathione (GSH), and glutathione peroxidase levels were measured, and the spinal cord tissue samples were examined histopathologically.

Results: No significant difference was detected in ischemia markers between control, IR, and IR+T groups, with the exception of GSH, which was significantly lower in the IR group. GSH levels in group 1 and group 3 were similar. The group 2 displayed significant ischemic damage to the medulla spinalis. This damage was less pronounced in group 3 compared with group 2 only, but in extent and intensity comparable with the controls.

Conclusions: Although we were not able to demonstrate a uniform effect of EGb on biochemical markers of IR injury, the histopathologic data appear to show a protective effect conferred on the spinal cord tissue by EGb.
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http://dx.doi.org/10.1016/j.avsg.2014.02.020DOI Listing
July 2014

The effect of copper on vasospastic femoral artery in rats.

Turk Neurosurg 2014 ;24(1):25-9

Bakirkoy Mazhar Osman Research and Training Hospital for Neurology, Department of Neurosurgery, Istanbul, Turkey.

Aim: The aim of this study was to investigate the effect of copper, which is the cofactor and regulator of the superoxide dysmutase enzyme, on preventing experimental peripheral vasospasm in rats through antioxidative mechanisms.

Material And Methods: Twenty-four female Wistar-Albino rats were divided into 3 groups: group 1 (n=8), control group; group 2 (n=8), vasospasm group; and group 3 (n=8), vasospasm + copper treatment group. Morphometric measurements of wall thickness and lumen diameter of femoral arteries were performed.

Results: Statistical comparison of groups 1 and 2, regarding thickness of vascular walls, revealed a significant increase in group 2 (p=0.037) and regarding lumen diameters, revealed a significant decrease in group 2 (p=0.043). Comparison of diameters of the vascular lumen of groups 1 and 3 showed no significant difference (p=0.19), whereas the comparison of the thicknesses of the vascular walls displayed a significant increase in group 3 (p=0.028). Comparison of groups 2 and 3 regarding diameter of vascular lumens showed a significant decrease in group 2 (p=0.042), whereas group 3 displayed a significant decrease, in terms of thickness of the vascular walls (p=0.029).

Conclusion: This study showed quantitatively that copper could prevent the development of experimental peripheral vasospasm in rats.
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http://dx.doi.org/10.5137/1019-5149.JTN.7120-12.1DOI Listing
October 2014

Effects of sodium hyaluronate and methylprednisolone alone or in combination in preventing epidural fibrosis.

Neurol Res 2013 Oct 15;35(8):851-6. Epub 2013 May 15.

Istanbul University, Istanbul, Turkey.

Objective: Epidural fibrosis and leptomeningeal adhesion formation are common causes of failed back surgery syndrome (FBSS). We employed a rat model of lumbar laminectomy to evaluate the histopathological effects of sodium hyaluronate (HA) and methylprednisolone (MP) alone or in combination on post-laminectomy epidural fibrosis.

Methods: Thirty-two male Sprague-Dawley rats were divided into four groups. All rats underwent three-level lumbar laminectomy. In the treatment groups, HA solution, MP, or a combination of both was applied locally to the epidural spaces of the laminectomy fields. No neurological deficits or pathological wound site changes were observed in any of the groups. At the end of the sixth week, all rats were sacrificed, and the laminectomy vertebral column areas were removed en-bloc. Specimens were evaluated by an expert neuropathologist according to histopathological criteria.

Results: The results of the three treatment groups were separately compared with the control group to assess epidural fibrosis. Minimal reduction in the rate of epidural fibrosis was observed in the groups treated with HA or MP compared with the control group. However, no significant difference in epidural fibrosis was noted between the combined treatment group and the control group.

Conclusions: Our study showed that MP and HA, given separately, significantly reduce post-laminectomy epidural fibrosis; however, the combination of these drugs is not effective. Further investigation is needed to address the causative drug interactions.
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http://dx.doi.org/10.1179/1743132813Y.0000000219DOI Listing
October 2013

Cerebral tuberculoma mimicking high grade glial tumor.

Turk Neurosurg 2011 ;21(3):427-9

M.H. Dr. Lutfi Kirdar Kartal Education and Research Hospital, Department of Neurosurgery, Istanbul, Turkey.

Tuberculosis has been an important public health problem in both developing and develop nations. Tuberculosis of the central nervous system is rare. Tuberculosis meningitis and tuberculoma are the two most important manifestations of tuberculosis of the CNS. Intracranial tuberculomas may be solitary or multiple. Solitary tuberculomas may be indistinguishable from cranial abscess or primary brain tumor. It is necessary to rule out tuberculoma in patients with intracranial mass lesions. We present a case of tuberculoma mimicking a high grade glial tumor on magnetic resonance imaging and clinical presentation. A 30-year-old woman presented with one-month history of epilepsy. Cranial magnetic resonance imaging showed a left occipital peripheral ring-enhanced lesion with central necrosis. There was a strong suspicion of glial tumor. The lesion was totally excised with left occipital craniotomy. Histological examination of mass revealed a tuberculoma. The patient was treated with antituberculous chemotherapy.
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http://dx.doi.org/10.5137/1019-5149.JTN.2947-10.0DOI Listing
December 2011

Recurrent paraganglioma of Meckel's cave: Case report and a review of anatomic origin of paragangliomas.

Surg Neurol Int 2011 19;2:45. Epub 2011 Apr 19.

Department of Neurosurgery, Klinikum Kassel, Kassel, Germany.

Background: Paragangliomas are rare, usually benign tumors of neural crest origin. They account for only 0.6% of all head and neck tumors. In the craniocervical area, they are more common in the carotid body and tympanico-jugular regions. To the authors' knowledge, a case of paraganglioma in Meckel's cave has not yet been reported in the medical literature. The pathogenesis and natural history of paragangliomas are still not well understood. We present a case of recurrent paraganglioma in Meckel's cave.

Case Description: A 53-year-old woman was diagnosed with trigeminal neuralgia, dysesthesia and hypoesthesia on the left side of the face, hearing disturbance and a history of chronic, persistent temporal headaches. Magnetic resonance imaging (MRI) showed a lesion located in Meckel's cave on the left side, extending to the posterior cranial fossa and compressing the left cerebral peduncle. The lesion was first thought to be a recurrence of an atypical meningioma, as the pathologist described it in the tissue specimen resected 3 years earlier, and a decision for re-operation was made. A lateral suboccipital approach to the lesion was used under neuronavigational guidance. The tumor was removed, and histological examination proved the lesion to be a paraganglioma. Five months later, the follow-up MRI showed local regrowth, which required subsequent surgical intervention.

Conclusions: A paraganglioma in Meckel's cave is an uncommon tumor in this location. Although ectopic paragangliomas have been described in the literature, a paraganglioma atypically located in Meckel's cave makes a topographic correlation difficult, mainly because paraganglionic cells are usually not found in Meckel's cave. Another peculiarity of the case is the local recurrence of the tumor in a relatively short time despite an attempted, almost gross total resection.
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http://dx.doi.org/10.4103/2152-7806.79763DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3108444PMC
July 2011

Primary cerebellopontine angle craniopharyngioma in a patient with Gardner syndrome.

J Clin Neurosci 2011 Feb 7;18(2):300-1. Epub 2011 Jan 7.

Second Neurosurgery Department, Dr. Lütfi Kirdar Kartal Education and Research Hospital, Kartal, Istanbul, Turkey.

Craniopharyngiomas usually involve the sella and suprasellar space. Ectopic craniopharyngiomas have rarely been reported at the cerebellopontine angle (CPA). We report a rare primary craniopharyngioma of the CPA without extension into the sellar region. The lesion was initially detected by MRI during investigation of multiple scalp fibromas. Multiple osteomas of the skull and face were detected 2years later, and colonic adenomatous polyposis was detected 4years later; typical features of Gardner syndrome. This is the third report of a primary CPA craniopharyngioma in a patient with Gardner syndrome.
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http://dx.doi.org/10.1016/j.jocn.2010.06.006DOI Listing
February 2011

Expression of Ki-67, p53 and vascular endothelial growth factor (VEGF) concomitantly in growth hormone-secreting pituitary adenomas; which one has a role in tumor behavior ?

Neuro Endocrinol Lett 2010 ;31(6):823-8

Department of Endocrinology and Metabolism, Istanbul University, Istanbul, Turkey.

Objective: In many pituitary tumor, immunohistochemical studies have been shown to be correlated with different aspects of tumor behavior.There is no study up to date in which markers of Ki-67, p53, VEGF were evaluated concomitantly in GH-secreting adenomas.This study aims to determine which marker has a major role in tumor behavior and whether these markers have a cut-off value to distinguish invasive adenoma from non-invasive pituitary adenoma.

Methods: Fourty-seven acromegalic patients operated by the same neurosurgeon were included in this study.Twenty-one patients(5micro/16 macro) had non-invasive adenomas and 26 had invasive macroadenomas.Eight patients(6 invasive macroadenomas, 2 microadenomas) were treated with OCT-LAR until one month prior to surgery with treatment duration range of 3-11 months.These patients were excluded from the study group as the noninvasive and invasive adenomas were compared.A separate analysis was performed in invasive adenomas to compare OCT(+) and OCT(-)patients.

Results: Both Ki-67 and p53 expressions showed no correlation with the invasive character of adenomas, but VEGF expression in invasive adenomas was significantly higher with respect to noninvasive group.Our study has taken intermediate staining (>25 %)for VEGF as a cut off value for invasive adenomas.It was also observed that the decrease in VEGF staining in OCT pretreated invasive adenomas was significantly more than those not treated with OCT.

Conclusion: VEGF becomes an independent stimulator of angiogenic growth and progression for GH-secreting adenomas with >25% cytoplasmic immunoreactivity.This cut-off value may be useful in determination of prognosis and appropriate treatment strategy.A short term preoperative OCT treatment may be useful as adjunctive therapy especially for locally invasive GH- secreting adenomas.
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March 2011

Bilateral Lhermitte-Duclos disease.

Neurol India 2010 Mar-Apr;58(2):309-11

2nd Department of Neurosurgery, Lutfi Kirdar Kartal Education and Research Hospital, Istanbul, Turkey.

Lhermitte-Duclos disease (LDD) is a pathologic entity with progrediating, diffuse hypertrophy chiefly of the stratum granulosum of the cerebellum. Typically LDD is a unilateral lesion of the cerebellum or in vermis. Here we report a case of LDD with bilateral lesions of cerebellar hemispheres managed surgically. A 28-year-old woman presented with one-year history of progressive headache, nausea, vomiting, and blurred vision. Neurologic examination revealed a bilateral mild papilledema, mild dysmetria, and dysdiadochokinesia. The cerebellar lesions caused moderate mass effect in posterior fossa with hydrocephalus, and Chiari type I malformation. We performed the suboccipital-retrosigmoid approach, and removed completely the left intracerebellar mass. Symptoms related to elevated intracranial pressure disappeared in a short period postoperatively.
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http://dx.doi.org/10.4103/0028-3886.63799DOI Listing
August 2010

Morphometric analysis of the influence of selenium over vasospastic femoral artery in rats.

Acta Neurochir (Wien) 2010 May 3;152(5):855-60. Epub 2010 Feb 3.

Bakirköy Dr. Sadi Konuk Research and Training Hospital, Neurosurgery Clinic, Istanbul, Turkey.

Background: Cerebral vasospasm (CV) is the leading cause of morbidity and mortality occurring after subarachnoid hemorrhage (SAH). Etiopathogenesis of CV is multifactorial. Selenium is the cofactor of the glutathione peroxidase (GSH-Px) enzyme which is a very important defense mechanism against antioxidants. According to the literature, oxidants are known to play a remarkable role in the pathogenesis of vasospasm occurring after SAH. Therefore, many studies have been conducted with antioxidant agents, based on the theory that elevated activity of GSH-Px enzyme might prevent the development of CV after SAH. Majority of those studies reported positive results. However, as a result of our literature review, we came across no study which involves the investigation of the role of selenium alone in the prevention of CV after SAH. In our study, we aim to find the answer to the following question: "Can selenium alone prevent cerebral vasospasm following SAH at early stage?"

Methods: We used the "rat femoral artery vasospasm model" of Okada et al. as the vasospasm model of our study. First, rats were divided into three groups: group 1 (n = 8), control group; group 2 (n = 8), vasospasm group; and group 3 (n = 8), vasospasm + selenium group. Statistical comparison of groups 1 and 2 revealed significant thickening in the vascular wall and a decrease in the lumen diameter in group 2, compared with group 1. Statistical comparison of the vascular lumen diameters of groups 1 and 3 showed no significant difference, whereas the comparison of mean vascular wall thickness displayed a significant increase in group 3. Moreover, statistical comparison of groups 2 and 3 regarding vascular lumen diameters showed a significant decrease in group 2, whereas group 3 displayed a significant decrease in terms of vascular wall thickness.

Conclusion: According to the results of our study, selenium morphometrically prevents the development of peripheral vasospasms.
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http://dx.doi.org/10.1007/s00701-010-0599-4DOI Listing
May 2010

Surgical outcome in hippocampal sclerosis following selective amygdalo-hippocampectomy.

Turk Neurosurg 2008 Oct;18(4):374-9

Istanbul University, Istanbul Faculty of Medicine, Department of Neurosurgery, Istanbul, Turkey.

Objectives: Temporal lobe epilepsy is the most common form of intractable partial epilepsy in adults with hippocampal sclerosis accounting for the majority of cases. Selective amygdalo-hippocampectomy (SEAH) is suggested as a safe and effective surgical procedure with the advantage of a better cognitive outcome.

Methods: We prospectively documented 56 consecutive patients with medically refractory medial temporal lob epilepsy. Candidates for surgery were determined as those with characteristic clinical and imaging findings, ictal recordings, and neuropsychological evaluation. A standard SEAH was performed and hippocampal sclerosis was histologically confirmed.

Results: In our study 76.7% of patients were classified as Engel I and 62.2% as ILAE I at their last follow up. Overall, at the last follow-up, 51.8% of patients were seizure-free since surgery (Engel 1a and ILAE 1a), 25% had stopped antiepileptic treatment, and another 52% had decreased either the dosage or number of antiepileptic drugs. 86.3% of the patients with abnormality on neurocognitive tasks showed improvement at the end of the 6 months post surgery.

Conclusion: SEAH is a safe and effective surgical procedure without the necessity of a larger resection and further invasive methods.
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October 2008

Removal of clival chordoma in an adolescent thorough combned pterional transsylvian and anterior temporal approach.

Turk Neurosurg 2007 ;17(1):55-9

Dr. Lültfi Kirdar Kartal Egitim ve Araştirma Hastanesi, Neurosurgery, Istanbul, Turkey.

Extensive and aggressive surgical removal is treatment of choice for patients who have chordomas of the cranial base. Well-developed microsurgical techniques, as well as good surgical judgment learned from experience are essential to avoid major morbidity. A 14-year-old female presented with progressive headaches and diplopia for three months. Cranial magnetic resonance imaging demonstrated a well-circumscribed mass in the clival region. The mass was totally excised via right combined pterional transsylvian and anterior temporal approach (+ orbitozygomatic osteotomy). The tumor was located extradurally. The resected tumor had the typical histological and immunohistochemical characteristics of chordoma. No radiation therapy or chemotherapy was administered.
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November 2007

Pure red cell aplasia associated with thymic follicular hyperplasia.

Saudi Med J 2007 May;28(5):798-9

Department of Internal Medicine, Istanbul School of Medicine, Istanbul University, Istanbul, Turkey.

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May 2007

Retrospective study of 23 pathologically proven cases of central nervous system tuberculomas.

Clin Neurol Neurosurg 2006 Jun;108(4):353-7

Department of Pathology, Division of Neuropathology, Istanbul Faculty of Medicine, Istanbul University, Temel Bilimler Binasi, 34390 Capa, Istanbul, Turkey.

Introduction: Extrapulmonary manifestations of tuberculosis involving the central nervous system (CNS) due to haematogenous spread are not a rare entity. It presents as meningitis or tuberculoma. Tuberculoma is a granulomatous inflammatory process mimicking a neoplasm radiologically, so usually a biopsy is performed.

Material And Results: Our study consisted of 23 pathologically proven cases of tuberculomas between 1988 and 2003. Patients were discussed clinically, radiologically and histologically. Headache, fever, weight loss and weakness are the most common clinical manifestations. Our patient's ages vary from 3 to 67 years with a mean of 31.8 years. Ninety-five percent of patients had bad social, economic and nutritional conditions. None of them were infected by human immunodeficiency virus (HIV). All patients had similar contrast-enhancing lesions radiologically. The majority of tuberculomas were located supratentorially. Only one patient presented two foci of (cerebral and cerebellar) tuberculomas. Nineteen tuberculomas were intracerebral; two were located in the cerebellum and one was intramedullary. Among those lesions, one cavernous sinus tuberculoma and one sellar tuberculoma were identified. Only two patients underwent stereotactic biopsy and 21 patients underwent surgical excision. Histopathologic examination revealed granulomatous inflammation with central caseous necrosis in all patients.

Discussion: Diagnosis of tuberculoma can be difficult, and in most of our cases, the clinical diagnosis was 'neoplasm'. For this reason, clinicians must always be aware of it and consider it in the differential diagnosis of central nervous system mass lesions.
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http://dx.doi.org/10.1016/j.clineuro.2005.03.001DOI Listing
June 2006

Heat stress increases the effectiveness of early ischemic preconditioning in spinal cord protection.

Eur J Cardiothorac Surg 2005 Sep;28(3):467-72

Department of Cardiovascular Surgery, Istanbul University, GATA, Haydarpasa Military Training Hospital, Istanbul 84390, Turkey.

Objective: This study was aimed to test the hypothesis that the combination of heat stress and early ischemic preconditioning (IP) applied before aortic occlusion would be protective against spinal cord ischemic injury.

Methods: Thirty Whister-Albino rats were randomly divided into three groups. In group 1 (n=10), aorta was clamped just distal to the left renal artery and above the iliac bifurcation for 45 min. Group 2 (n=10) had 5 min of transient aortic occlusion and 30 min later underwent an additional 45 min. In group 3 (n=10), animals were heated to 41 degrees C and maintained at this temperature for 15 min. Twenty-four hours later, this hyperthermia pretreated group underwent the same early IP model of aortic occlusion. Neurologic status was assessed on postoperative 24 and 48 h by using the 15-point neurologic performance scale. Spinal cords were harvested for histopathological grading (1-4) and evaluated for the presence of heat shock protein-ubiquitin staining.

Results: At 24 and 48 h, the mean neurologic performance scores of the group 1 were found to be significantly lower than those of groups 2 and 3. Although the neurologic assessment of rats performed on the 24h did not reveal statistically significant difference between groups 2 and 3 (P=0.069); on 48 h, the mean neurologic scores of the group 3 were significantly higher than those of group 2 (P=0.005). At 48 h, a delayed neurologic deterioration was seen in groups 1 and 2 when compared to the results obtained at 24h. Histologic evaluation correlated well with the neurologic outcome with the least cellular damage in group 3. There were six rats with ubiquitin expression and this was detected only in animals pretreated with sublethal heat stress.

Conclusions: An early IP model with a short reperfusion interval does not give the minimal required time for the HSPs expression and is associated with a delayed neurologic deterioration. Neuroprotection provided by heat stress combined with an early IP model lasts up to 48 h and heat shock protein-ubiquitin induction may be responsible in this phenomenon.
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http://dx.doi.org/10.1016/j.ejcts.2005.06.014DOI Listing
September 2005

Glioblastoma with lymph node metastases.

Neuropathology 2003 Jun;23(2):146-9

Istanbul University, Istanbul Medicine Faculty, Department of Pathology, Istanbul, Turkey.

Metastatic spread of malignant astrocytomas is rare and documented in very few patients with this tumor. Both pathologists and clinicians may confront more of these cases as the patients live longer. We present a 40-year-old-man with glioblastoma multiforme metastasizing to the supraclavicular lymph node after surgery. The tumor was located at the parietal convexity and several lymphadenopathies occured after surgery.
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http://dx.doi.org/10.1046/j.1440-1789.2003.00490.xDOI Listing
June 2003