Erdener Timurkaynak

Ankara University, Engüri, Ankara, Turkey

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Publications (51)63.78 Total impact

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    Yusuf Izci · Erdener Timurkaynak
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    ABSTRACT: Microsurgical techniques have played a crucial role in the development of neurosurgery and microsurgical education has an involuting role to gain surgical competence in neurosurgery. Microsurgery laboratory at Gulhane Military Medical Academy (GMMA) was established in 1985 by Prof. Erdener Timurkaynak within the Research-Development Building. From the beginning, education of the surgeons in microsurgery has been regarded as the essential function of this center, but many experimental and anatomical researches have also taken place in this laboratory. Over the past twenty-five years, 288 courses had been held in the microsurgical laboratory and more than 1000 surgeons from different fields and specialties were trained. Many of them conducted hundreds of research projects and published scientific papers during this period. This laboratory enters in the 21st century as a dynamic research and education center committed to the continuing delivery of education, as well as ongoing research of microsurgery for the coming 100 years.
    Preview · Article · Apr 2010 · Turkish neurosurgery
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    ABSTRACT: Percutaneous vertebroplasty (PV) is one of the alternative treatments for vertebral fractures. Reported significant complications include pain, radiculopathy, spinal cord compression, pulmonary embolism, infection and rib fractures. In this report, we highlight intradural cement leakage which is a rare complication of the procedure. A 49 year old man with a T12 compression fracture due to multiple myeloma was referred to the neurosurgery department from the orthopaedics and traumatology clinic after developing a right lower limb weakness following percutaneous vertebroplasty with polymethylmethacrylate. An urgent thoraco-lumbar magnetic resonance imaging was performed. The T1 and T2-weighted images demonstrated intradural extramedullary and epidural cement leakages which were hypointense on both sequences. Total laminectomy was performed at T12 and L1 and two epidural cement collections were excised on the right. Then, a dural incision from T12 to the body of L1 was done and cement material seen in front of the rootlets excised without any nerve injury. The patient was discharged after a week and referred to the haematology clinic for additional therapy of multiple myeloma. Although the cement leakage was extensive, the right leg weakness improved significantly and he began to walk with assistance 3 months later. Good quality image monitoring and clear visualisation of cement are essential requirements for PV using polymethylmethacrylate to prevent this complication from the treatment.
    No preview · Article · Jun 2008 · Acta Neurochirurgica
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    Hakan Sabuncuoğlu · Selçuk Ozdoğan · Erdener Timurkaynak
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    ABSTRACT: Although the first reported surgery for lumbar disc herniation was published many years ago, there still remains little agreement for the most effective treatment protocol for symptomatic cases. Many patients with extruded lumbar disc herniation require surgical intervention due to radiculopathy of lower extremities but some neurological symptoms of intervertebral disc herniation may frequently improve with conservative treatment. In this paper, two cases of spontaneous regression of extruded lumbar herniated discs are presented. The disc regressions of two patients were correlated with clinical improvement and documented with follow up MRI studies. Additionally the clinical course of lumbar disc herniation was discussed with mechanisms, features of MRI, immunohistological pathology and treatment options of past clinical studies.
    Preview · Article · Feb 2008 · Turkish neurosurgery
  • Erdener Timurkaynak · Yusuf Izci · Feridun Acar
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    ABSTRACT: Despite their unfavorable locations, lesions of the third ventricle can be successfully removed via an interhemispheric, transcallosal approach. In cases with normal ventricular anatomy, this approach requires unilateral or bilateral identification of the foramen of Monro. However, in the presence of abnormal ventricular configuration such as cavum septum pellucidum (CSP), this basic knowledge needs to be modified. After routine callosotomy, there may be a confusion while entering the CSP due to the invisualization of ventricular landmarks such as the foramen of Monro, thalamostriate vein, and choroid plexus. The floor of the CSP is formed by the fornices, and a direct approach to the interforniceal area is easier via the CSP. But the interforniceal approach is not a routine way to reach the third ventricle, which has higher risks than other modalities. This approach should be planned and used in selected cases of the CSP. Opening of the walls of CSP is recommended both to expose both the foramen of Monro and to gain safe access to the third ventricle before manipulating the interforniceal area.
    No preview · Article · Dec 2006 · Surgical Neurology
  • Erdener Timurkaynak · Yusuf Izci · Feridun Acar
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    ABSTRACT: Modern medical education in the Ottoman Empire began with the founding of the School of Medicine and Surgery in 1827. This was a military school established to provide military physicians for the army. The first neurosurgical interventions at this school were initiated by Cemil Pasha in 1889. This school has gradually expanded since its opening, and was reorganized and renamed "Gulhane Military Medical Academy" in 1898 as the result of efforts to establish modern medical education and practice in the Ottoman Empire. Neurosurgical operations have been continued by the different surgeons in the Department of Surgery at Gulhane Military Medical Academy. In 1957, the Department of Neurosurgery became an independent department through the work of Professor Zinnur Rollas. Today, neurosurgery is a dynamic and constantly changing department at Gulhane Military Medical Academy with work still in progress on technological, diagnostic, and surgical innovations that permit the treatment of highly complex cases.
    No preview · Article · Apr 2006 · Neurosurgery
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    Sait Sirin · Engin Gonul · Serdar Kahraman · Erdener Timurkaynak
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    ABSTRACT: Epidermoid tumors have similar radiologic characteristics with arachnoid cysts on routine imaging techniques. Since they warrant different therapeutic interventions, it is essential to differentiate the two pathologies and to assess operative results. The purpose of this study is to define the MR characteristics of epidermoid tumors in posterior fossa particularly on fluid-attenuated inversion recovery (FLAIR) and diffusion-weighted imaging (DWI). During a 10-year period, we operated 19 cases with epidermoid tumor of posterior fossa. The localization of the epidermoids was cerebellopontine angle in 16 patients, within the fourth ventricle in 2 patients and pineal region in 1 patient. Neuroimaging included CT in all patients, conventional MR in 14 patients and FLAIR and DWI in the last 6 patients. In the first 13 cases, diagnosis of epidermoid tumor was difficult on CT and conventional MR. Epidermoids appeared as heterogeneous hyperintense lesions on FLAIR and homogenous hyperintense lesions on DWI in the last 6 patients. While total resection of the tumor was achieved in 17 patients, subtotal resection was performed in 2 patients. Histopathological examinations of the specimens revealed epidermoid tumor in all cases. Advances in neuroradiology provide us advantages for planning the treatment modalities in epidermoid tumors of the posterior fossa. The difficulties in preoperative differential diagnosis and judgment for reoperation in the postoperative course have been decreased particularly via FLAIR and DWI.
    Full-text · Article · Nov 2005 · Clinical Neurology and Neurosurgery
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    ABSTRACT: This study was performed to investigate the antioxidant effect of beta-Glucan in experimental spinal cord injury (SCI). Injury was produced using weight-drop technique in rats. beta-Glucan was given by intraperitoneal injection following trauma. The rats were sacrificed at the sixth day of injury. Oxidative stress status was assessed by measuring the spinal cord tissue content of Malonyldialdehyde (MDA), Superoxide Dismutase (SOD) and Gluthatione Peroxidase (GSH-Px) activities. No effect of beta-Glucan on SOD and MDA activities was found but, GSH-Px levels were found to decrease to the baseline (preinjury) levels when it was compared to untreated group (U=0.000; p=0.002). According to our results, beta-Glucan works like a scavenger and has an antioxidant effect on lipid peroxidation in spinal cord injury.
    Full-text · Article · Nov 2005 · Neurosurgical Review
  • Kamil Melih Akay · Yusuf Izci · Alper Baysefer · Erdener Timurkaynak
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    ABSTRACT: The authors report on a child with a composite type of split cord malformation (SCM). The patient presented with symptoms of a common cold. The diagnosis of SCM was made based on computerized tomography and magnetic resonance (MR) imaging of whole spinal axis. The SCM was Type I at T-4 and T-5 and Type II at T-12, according to the classification developed by Pang. The child underwent resection of the splitting lesions and terminal filum release. No case of composite-type SCM reported to date contains documentation of such a malformation. Because of the possible neurological and urological problems, the authors recommend MR imaging of the whole spine be performed during/an evaluation for SCM.
    No preview · Article · Jun 2005 · Journal of Neurosurgery
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    ABSTRACT: The aim of this study was to analyze the effect of a surgical management protocol and other important clinical features on the prognosis of patients who had penetrating orbitocranial gunshot injuries. Thirty-five patients (30 unilateral, 5 bilateral) who had penetrating orbitocranial gunshot injuries were analyzed. The wounds were mainly caused by shrapnel fragments or bullets. Craniotomy was the standard treatment in all patients. Investigated clinical features included Glasgow Coma Scale (GCS) score on admission, the mode and the extent of brain injury, and the presence of an intracranial retained foreign body. The prognostic importance of complications such as infection, intracranial hemorrhage, cerebrospinal fluid leak, and epileptic seizures was also investigated. The mechanism and the injury characteristics of the patients were evaluated by predicting the visual outcome of the victims according to a newer classification system as well as other variables pertinent to this specific clinical setting of severe eye trauma. Final visual acuities of the patients were also measured. The outcome of 35 penetrating orbitocranial gunshot injured patients was as follows: death in 3 patients, vegetative state in 1, severe disability in 2, moderate disability in 2, and good recovery in 27 cases. Localization and extent of the injury and GCS score on admission were the most important indicator for good neurological outcome. The predictors for good visual outcome were type B, grade 1, zone I, and relative afferent pupillary defect-negative injuries. The predictors for poor outcome were type A, grade 5, zone III, and relative afferent pupillary defect-positive injuries. The prognosis of the injury depends on the course of the bullet or shrapnel fragment and the interdisciplinary care. An extensive preoperative evaluation of penetrating orbital trauma and a combined ophthalmic and neurosurgical approach are recommended to minimize the morbidity of the patients. However, complete removal of the foreign material in a deep or ventricular localization is not mandatory because careful debridement and tight closure of dura provides desired outcome. Evaluation of trauma mechanism and injury characteristics according to the Ocular Trauma Classification System seems to predict accurately the visual outcomes in this series.
    No preview · Article · Feb 2005 · Surgical Neurology
  • Yusuf Izci · Ersin Erdogan · Erdener Timurkaynak

    No preview · Article · Feb 2005 · Journal of Neurosurgical Anesthesiology
  • F. Acar · H. Kayali · E. Erdoǧan · S. Kahraman · E. Timurkaynak
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    ABSTRACT: Lumbar disc disease may be confused with the other pathologies that generate sciatic pain. One of these pathologies is an abnormal dilated epidural venous plexus that mimics herniated lumbar disc disease. The purpose of this report is to describe this situation. Between 2002 and 2004, three of our patients underwent lumbar disc surgery with the preoperative diagnosis of lumbar disc herniation. Instead of disc herniation, abnormal dilated venous plexi were observed at the same level in all patients during the surgery. An abnormal epidural venous plexus that mimics lumbar disc herniation is a rare clinical entity and this pathology should be kept in mind during lumbar disc surgery.
    No preview · Article · Jan 2005
  • Y. Izci · D. Gürkanlar · Ö. Öngürü · E. Timurkaynak
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    ABSTRACT: Although choroid plexus carcinoma is a rare and malignant intraventricular neoplasm that is usually seen in the pediatric age group, it may also present in older individuals. Radiotherapy following radical surgery is the main treatment strategy. A 54-year-old male patient with choroid plexus carcinoma is reported. Preoperative and postoperative radiological examinations were performed. The patient underwent radiotherapy following gross total excision of the tumor but died at the end of the first year despite treatment.
    No preview · Article · Jan 2005
  • Y. Izci · D. Gürkanlar · E. Timurkaynak
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    ABSTRACT: Multicentric gliomas are uncommon lesions of the central nervous system (CNS) with an unprecise rate of occurrence that diffusely infiltrate large portions of the brain. Glioblastoma multiforme is the most agressive form of gliomas and often has a distinct neuroimaging pattern with poor prognosis. We present three cases with multicentric gliomas diagnosed as glioblastoma multiforme. The radiological and clinical features of these rare entities were analyzed. We performed surgical treatment and subsequent radiotherapy for each patient. Although it is difficult to diagnose and treat multicentric gliomas, the aim of the surgeon must be to remove the biggest and/or the nearest and most accessible lesion without causing additional neurological deficit. Further management, either radiotherapy or chemotherapy, must be based on the histopathological diagnosis.
    No preview · Article · Jan 2005
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    Feridun Acar · Hakan Kayalı · Ersin Erdoğan · Serdar Kahraman · Erdener Timurkaynak
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    ABSTRACT: Lumbar disc disease may be confused with the other pathologies that generate sciatic pain. One of these pathologies is an abnormal dilated epidural venous plexus that mimics herniated lumbar disc disease. The purpose of this report is to describe this situation. Between 2002 and 2004, three of our patients underwent lumbar disc surgery with the preoperative diagnosis of lumbar disc herniation. Instead of disc herniation, abnormal dilated venous plexi were observed at the same level in all patients during the surgery. An abnormal epidural venous plexus that mimics lumbar disc herniation is a rare clinical entity and this pathology should be kept in mind during lumbar disc surgery. KEY WORDS: Dilated epidural venous plexus, lumbar disc surgery
    Full-text · Article · Jan 2005 · Turkish Neurosurgery
  • Alper Baysefer · Kamil Melih Akay · Yusuf Izci · Hakan Kayali · Erdener Timurkaynak
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    ABSTRACT: A series of 20 pediatric patients underwent surgery for spinal tumor at the Department of Neurosurgery, Gulhane Military Medical Academy between 1995 and 2003. Motor weakness and reflex changes were the main initial signs in these patients. Epidural tumors and intradural-extramedullary tumors were in equal number, and total tumor removal was achieved in most of the patients without adjuvant treatment. Laminotomy was the main surgical method in 60% of the patients with spinal tumor, especially in children younger than 3 years of age.
    No preview · Article · Nov 2004 · Pediatric Neurology
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    Ersin Erdogan · Yusuf Izci · Engin Gonul · Erdener Timurkaynak
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    ABSTRACT: Gunshot wounds to the head are usually fatal injuries, despite all medical and surgical interventions. Ventricular injury is a poor prognostic factor-for penetrating cranial gunshot wounds. Intraventricular hemorrhage and ventricular lacerations are the main components of such injuries. The incidence, management, and outcomes of cases of ventricular injury secondary to cranial gunshot wounds that were treated during a 9-year period at Gülhane Military Medical Academy were examined. The study group consisted of 67 consecutive patients who were admitted to the Department of Neurosurgery with the diagnosis of ventricular injury, with different penetration sites. The patients had been injured by either bullets or shrapnel. Surgical treatment was performed for all patients with ventricular injuries and 22 (32.8%) died. Ventricular injury in cranial gunshot wounds is a complex severe type of trauma that requires serious treatment. Early radiological diagnosis and accurate treatment frequently had lifesaving roles for these patients.
    Preview · Article · Oct 2004 · Military medicine
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    Kamil Melih Akay · Yusuf Izci · Alper Baysefer · Cem Atabey · Erol Kismet · Erdener Timurkaynak
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    ABSTRACT: Cerebellar tumors in childhood are generally associated with a favorable outcome if they are managed appropriately. 27 cases of pediatric cerebellar tumors, operated over a 7-year period, are presented. Histopathological diagnoses were as follows: pilocytic astrocytoma (48.2%); medulloblastoma (22.2%); ependymoma (18.5%); fibrillary astrocytoma grade III (3.7%); cystic oligodendroglioma (3.7%), and hemangioblastoma (3.7%). Microscopic gross total resection was achieved in 16 (59.3%) of 27 cases. The total removal of pediatric cerebellar tumors without neurological deficit is possible with appropriate microsurgical techniques excluding brain stem invasion. The follow-up periods must be shorter if brain stem invasion exists. Radiotherapy and chemotherapy are the adjuvant therapies according to the pathological diagnosis and the patient's age.
    Full-text · Article · Sep 2004 · Pediatric Neurosurgery
  • H Kayali · O Onguru · E Erdogan · S Sirin · E Timurkaynak
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    ABSTRACT: Sinus histiocytosis with massive lymphadenopathy (SHML), also known as Rosai-Dorfman disease (RDD), is an idiopathic histiocytic proliferation affecting lymph nodes. It is typically characterized by painless cervical lymphadenopathy, fever and weight loss. Although extranodal involvement has been reported in diverse sites, intracranial presentation, particularly in the absence of nodal disease is uncommon. To the best of our knowledge, 48 patients with intracranial masses have been reported previously. A 31-year-old man was admitted to our clinic with a 4-month history of progressive headache. His medical history was unremarkable except for occasional fever. There were not any neurological deficit and weight loss. No lymphadenopathy (particularly bilateral cervical) and extranodal involvement in diverse sites were revealed by physical and radiological examinations. Routine hematological and biochemical studies were normal except for mild leukocytosis and elevated erythrocyte sedimentation rate. The patient underwent magnetic resonance imaging (MRI) testing that revealed an enhancing mass in the left temporal lobe. Preoperative diagnosis was meningioma. The patient underwent a left frontotemporal craniotomy with complete resection of the mass. Histopathology was compatible with RDD. Extranodal RDD is rarely found intracranially. Prognosis is benign especially in the absence of nodal disease. It is clinically and radiologically difficult to distinguish from meningioma, and histological examination is essential for a definitive diagnosis.
    No preview · Article · Sep 2004 · Clinical neuropathology
  • Alper Baysefer · Yusuf Izci · Kamil Melih Akay · Hakan Kayali · Erdener Timurkaynak
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    ABSTRACT: The ulnar nerve provides the major motor innervation of the interosseous muscles of the hand and the flexor muscles of the wrist and the fourth and fifth digits. Injury is most common at the wrist, forearm or elbow, secondary to trauma or entrapment. Pediatric ulnar nerve lesions differ from adult lesions by their quicker axonal regeneration. Neural plasticity is also greater in children. We analyzed 21 pediatric patients with ulnar nerve lesion who underwent surgical treatment between 1995 and 2002 to determine if there were differences in the neurological outcome in terms of the type of lesion and surgery. Data showed that excellent results were found in 100% of the lesions treated by simple decompression and nearly 58% of the lesions treated by neurolysis. Good results were obtained in 33% of lesions treated by neurolysis. There were fair results for surgery performed in discontinuous lesions.
    No preview · Article · Sep 2004 · Pediatric Neurosurgery
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    ABSTRACT: Two young adult males presented with paranasal sinus osteoma associated with mucocele. A 20-year-old man presented with headache and seizure, and another 20-year-old man presented with headache, frontal deformity, and visual disturbances. Both patients underwent surgery and satisfactory results were obtained. Isolated paranasal sinus osteomas are benign and slow-growing tumors, but may become more aggressive in association with mucoceles. The higher aggressiveness of the lesions may be due to the presence of the mucocele. Calcification and ossification of the mucocele probably contributes to the unexpected enlargement of the osteoma.
    No preview · Article · May 2004 · Neurologia medico-chirurgica

Publication Stats

634 Citations
63.78 Total Impact Points

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Institutions

  • 2008-2010
    • Ankara University
      • Department of Neurosurgery
      Engüri, Ankara, Turkey
  • 2006
    • Ufuk Üniversitesi
      Engüri, Ankara, Turkey
  • 2000-2006
    • Gulhane Military Medical Academy
      • Department of Neurosurgery
      Engüri, Ankara, Turkey