Researcher: Egemen, Emrah
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Egemen, Emrah
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Publication Metadata only Enlargement of neural foramina and dynamic stabilization in spondylolisthesis without restoring the alignment: technical note(Seoul : Taehan Ch'ŏkch'u Sin'gyŏng Oekwa Hakhoe, 2016) Sasani, Mehdi; N/A; Özer, Ali Fahir; Süzer, Süleyman Tuncer; Egemen, Emrah; Öktenoğlu, Bekir Tunç; Faculty Member; Faculty Member; Doctor; Faculty Member; School of Medicine; School of Medicine; N/A; School of Medicine; N/A; N/A; Koç University Hospital; N/A; 1022; 221691; N/A; 220898It is well known that the cause of radiculopathy is the compression of the nerve root within the foramina which is narrowed secondary to sliding of the corpus and reduced disc height. In some patients, unroofing the foramen does not resolve this problem. We described a new decompression technique using pedicle removal and transpedicular dynamic instrumentation to stabilization the spine. We performed this operation in 2 patients and achieved very good results.Publication Metadata only Novel foraminal expansion technique(Korean Spine Society, 2016) Ciplak, Mert; Oktenoglu, Tunc; Sasani, Mehdi; N/A; Özer, Ali Fahir; Şentürk, Salim; Egemen, Emrah; Yaman, Onur; Süzer, Süleyman Tuncer; Faculty Member; Doctor; Doctor; Doctor; Faculty Member; School of Medicine; N/A; N/A; N/A; School of Medicine; N/A; Koç University Hospital; Koç University Hospital; Koç University Hospital; N/A; 1022; N/A; N/A; 219524; 221691The technique we describe was developed for cervical foraminal stenosis for cases in which a keyhole foraminotomy would not be effective. Many cervical stenosis cases are so severe that keyhole foraminotomy is not successful. However, the technique outlined in this study provides adequate enlargement of an entire cervical foraminal diameter. This study reports on a novel foraminal expansion technique. Linear drilling was performed in the middle of the facet joint. A small bone graft was placed between the divided lateral masses after distraction. A lateral mass stabilization was performed with screws and rods following the expansion procedure. A cervical foramen was linearly drilled medially to laterally, then expanded with small bone grafts, and a lateral mass instrumentation was added with surgery. The patient was well after the surgery. The novel foraminal expansion is an effective surgical method for severe foraminal stenosis.Publication Metadata only Early brain injury or vasospasm? An overview of common mechanisms(Bentham Science Publ Ltd, 2017) N/A; N/A; N/A; N/A; Topkoru, Başak Caner; Egemen, Emrah; Solaroğlu, İhsan; Doctor; Doctor; Faculty Member; N/A; N/A; N/A; School of Medicine; N/A; Koç University Hospital; N/A; N/A; 102059; N/ABackground: Subarachnoid hemorrhage (SaH) following rupture of an intracranial is associated with high mortality and morbidity. the late deterioration of the patient's neurological status or late cognitive dysfunctions even after secure clipping or decent endovascular treatment which is defined as delayed ischemic neurological deficits recently has been attributed to vasospasm. Due to the failure of specific anti-vasospastic agents in clinical trials researchers focused to explore new pathological mechanisms to be responsible for the delayed deterioration of the patients suffering from SaH. Early brain injury (EBI), As a new term in the SaH research area has been the focus of scientist for the past couple of years. Objective: the goal of this study is to review the common mechanisms of early brain injury and vasospasm. Results: the acute events following SaH, such as increased intracranial pressure and decreased cerebral blood flow, causing global cerebral ischemia initiate a cascade of pathological changes including inflammation, lipid peroxidation, cell death and blood brain barrier disruption. Conclusion: the more insight we gain into the EBI we realize that there are a bunch of common mechanisms between EBI and vasospasm. in the SaH management, A therapy targeting these early injuries may also reduce the later developing pathological neurological complications.Publication Metadata only Anatomy of cerebral veins and dural sinuses(Elsevier, 2017) N/A; Egemen, Emrah; Solaroğlu, İhsan; Doctor; Faculty Member; N/A; School of Medicine; Koç University Hospital; N/A; 102059The intracranial venous system of human has unique anatomical and histological characteristics and includes variations for each individual. Cerebral veins are very thin because of absence of muscular layer and do not have valves unlike other part of body. They are investigated in three systems, which are superficial and deep venous systems, and veins of posterior fossa. All cortical and deep veins drain into the internal jugular veins via special collecting system called dural venous sinuses. Dural sinuses are large, endothelial-lined trabeculated channels. They are placed between periosteal and meningeal layer of dura mater and includes less variations unlike cortical venous system of brain. Even though occlusion of cerebral veins is very rare entity, thrombosis or traumatic/iatrogenic damage of main cerebral venous structures may lead to severe clinical outcomes. Therefore, the anatomical structure should be well understood by the physicians.Publication Open Access Lumbar single-level dynamic stabilization with semi-rigid and full dynamic systems: a retrospective clinical and radiological analysis of 71 patients(Korean Orthopaedic Association, 2017) Yilmaz, A.; Erbulut, D.U.; N/A; Özer, Ali Fahir; Öktenoğlu, Bekir Tunç; Egemen, Emrah; Sasani, Mehdi; Yaman, Onur; Süzer, Süleyman Tuncer; Faculty Member; Faculty Member; Doctor; School of Medicine; 1022; N/A; N/A; N/A; N/A; 221691Background: This study compares the clinical and radiological results of three most commonly used dynamic stabilization systems in the field of orthopedic surgery. Methods: A total of 71 patients underwent single-level posterior transpedicular dynamic stabilization between 2011 and 2014 due to lumbar degenerative disc disease. Three different dynamic systems used include: (1) the Dynesys system; (2) a dynamic screw with a PEEK rod; and (3) a full dynamic system (a dynamic screw with a dynamic rod; BalanC). The mean patient age was 45.8 years. The mean follow-up was 29.7 months. Clinical and radiological data were obtained for each patient preoperatively and at 6, 12, and 24 months of follow-up. Results: Clinical outcomes were significantly improved in all patients. There were no significant differences in the radiological outcomes among the groups divided according to the system used. Screw loosening was detected in 2 patients, and 1 patient developed screw breakage. All patients with screw loosening or breakage underwent revision surgery. Conclusions: Each procedure offered satisfactory outcome regardless of which system was applied.Publication Open Access Rare case of glioblastoma multiforme located in posterior corpus callosum presenting with depressive symptoms and visual memory deficits(BMJ Publishing Group, 2016) Eser, Hale Yapıcı; Onay, Aslıhan; Çakmak, Özgür Öztop; Egemen, Emrah; Vanlı-Yavuz, Ebru Nur; Solaroğlu, İhsan; Faculty Member; Doctor; Faculty Member; School of Medicine; Koç University Hospital; 134359; N/A; N/A; N/A; N/A; 102059Most of the primary brain tumours are located in the supratentorial region, and it is uncommon to see tumour growth on deep brain structures such as posterior corpus callosum (PCC). In addition, lesions in PCC are also difficult to recognise, because construction apraxia, visuospatial perception and attentional capacity impairment may be the only presenting symptoms. Here, we represent a rare case of gliobastoma multiforme located in PCC, which solely presents with depressive symptoms and visual memory deficits. Initial manifestations of primary brain tumours with psychiatric symptoms and memory disturbances, in addition to headaches and seizures, should be kept in mind.