Person: ABDALLAH, ANAS ABDELRAHıM SA
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Publication Open Access Investigation of Brain Impairment Using Diffusion-Weighted and Diffusion Tensor Magnetic Resonance Imaging in Experienced Healthy Divers.(2018-11-17) SEYITHANOĞLU, MEHMET HAKAN; ABDALLAH, ANAS ABDELRAHIM SA; Dündar, TOLGA TURAN; KITIŞ, SERKAN; ARALAŞMAK, AYŞE; Gündağ, Papaker; SASANI, H; SEYİTHANOĞLU, MEHMET HAKAN; ABDALLAH, ANAS ABDELRAHıM SA; DÜNDAR, TOLGA TURAN; KİTİŞ, SERKAN; ARALAŞMAK, AYŞE; GUNDAG, MELİHABackground: The aim of this study was to understand the changes of decompression illness in healthy divers by comparing diffusion-weighted (DWI) and diffusion tensor MRI findings among healthy professional divers and healthy non-divers with no history of diving. Material/Methods: A total of 26 people were recruited in this prospective study: 11 experienced divers with no history of neurological decompression disease (cohort) and 15 healthy non-divers (control). In all study subjects, we evaluated apparent diffusion coefficient (ADC) and type of diffusion tensor metric fractional anisotropy (FA) values of different brain locations (e.g., frontal and parieto-occipital white matter, hippocampus, globus pallidus, putamen, internal capsule, thalamus, cerebral peduncle, pons, cerebellum, and corpus callosum). Results: ADC values of hippocampus were high in divers but low in the control group; FA values of globus pallidus and putamen were lower in divers compared to the control group. DWI depicted possible changes due to hypoxia in different regions of the brain. Statistically significant differences in ADC values were found in hypoxia, particularly in the hippocampus (p=0.0002), while FA values in the globus pallidus and putamen were statistically significant (p=0.015 and p=0.031, respectively). We detected forgetfulness in 6 divers and deterioration in fine-motor skills in 2 divers (p=0.002 and p=0.17, respectively). All of them were examined using neuro-psychometric tests. Conclusions: Repeated hyperbaric exposure increases the risk of white matter damage in experienced healthy divers without neurological decompression illness. The hippocampus, globus pallidus, and putamen are the brain areas responsible for memory, learning, navigation, and fine-motor skills and are sensitive to repeated hyperbaric exposurePublication Open Access BRAF V600E mutation and BRAF VE1 immunoexpression profiles in different types of glioblastoma.(2018-08-01) TURNA, S; GEÇER, MELİN; Hatiboğlu, MUSTAFA AZİZ; ABDALLAH, ANAS ABDELRAHIM SA; TOSUNER, ZEYNEP; GEÇER, MELİN; HATİBOĞLU, MUSTAFA AZİZ; ABDALLAH, ANAS ABDELRAHıM SA; TURNA, SEVALPublication Metadata only Solitary osteochondroma arising from cervical spina bifida occulta.(2013-01-01T00:00:00Z) OFLUOGLU, AE; Abdallah, ANAS ABDELRAHIM SA; GOKCEDAG, A; ABDALLAH, ANAS ABDELRAHıM SAPublication Metadata only Factors affecting the surgical outcomes of tethered cord syndrome in adults: a retrospective study(2018-01-01) Abdallah, ANAS ABDELRAHIM SA; EMEL, Erhan; ASILTURK, Murad; SOFUOGLU, Ozden Erhan; ABDALLAH, ANAS ABDELRAHıM SAThis study aimed to find the factors that may affect the surgical outcomes of congenital tethered cord syndrome (TCS) in adults by evaluating the long-term surgical outcomes of 25 consecutive cases. Medical records of 79 TCS cases which underwent surgery in BakA +/- rkoy Research and Training Hospital for Neurology, Neurosurgery and Psychiatry (BRSHH), during an 11-year period from 2005 to 2015, were retrospectively reviewed. All adult cases (patient age > 18 years) were selected as the core sample used for this study. Twenty-five cases of TCSs were surgically treated. The sample consists of 16 female and nine male patients. The mean age of the sample is 30.1 +/- 10.3 years. Untethering was carried out in 88% of the patients. Sixty-four percent of the patients had good clinical outcomes at their last follow-up (after 73.8 months on average). The mean length of hospital stay was 4.76 +/- 2.88 days. In a multivariate regression model, laminectomy, bladder dysfunction when associated to muscular weakness, and long-term (> 6 months) symptoms were selected as the independent risk factors associated with poor or minimally improved (almost unchanged) surgical outcomes. When the urodynamic test showed overactive detrusor muscle, no improvement was recorded in postoperative urodynamic test. Laminoplasty (or hemilaminectomy), short-term (< 6 months) symptoms, patients without lipomas, and presentation with moderate or mild symptoms seem to be proper predictors for good surgical outcomes. Further prospective studies are necessary to investigate these findings systematically. Urodynamic study can be used as a predictive tool for close follow-up of asymptomatic adult patients involved with TCS.Publication Metadata only Management of Tethered Cord Syndrome in Adults: Experience of 23 Cases(2017-03-01T00:00:00Z) SOFUOGLU, Ozden Erhan; Abdallah, ANAS ABDELRAHIM SA; EMEL, Erhan; OFLUOGLU, Ali Ender; GUNES, Muslum; GULER, Betul; ABDALLAH, ANAS ABDELRAHıM SAAIM: Tethered cord syndrome (TCS) is rarely diagnosed in adults. It is a complex clinicopathological entity that remains poorly understood. In this study, clinical outcomes of 23 consecutive congenital TCSs diagnosed in adults have been evaluated to establish a standard approach to treat congenital TCS diagnosed in adults.Publication Open Access Radiation-Induced Meningiomas: A Series of Four Consecutive Patients and a Review of Literature(2018-01-01) ABDALLAH, ANAS ABDELRAHIM SA; GÜNDÜZ, Hasan Burak; EMEL, Erhan; ASİLTÜRK, Murad; Sofuoğlu, Özden Erhan; BİLGİÇ, Bilge; GÜLER ABDALLAH, Betül; ABDALLAH, ANAS ABDELRAHıM SAAIM: To assess the clinical outcomes of treatment for radiation-induced meningiomas. MATERIAL and METHODS: Medical records were retrospectively reviewed for all cranial meningioma cases that were diagnosed and/or underwent surgery at our hospital from 2009 to 2016. All radiation-associated meningioma patients constituted the core sample for this study. RESULTS: This series included one female and three male patients, with a mean age of 47.3 ± 16.3 years. The mean preoperative course was <3 months. The most common symptom was headache (100%) and three patients had alopecia and thin scalp skin. The mean of the age at which they underwent radiotherapy was 18.5 ± 13.7 years. The mean latency period was 19.2 ± 7.4 years. Initial malignancies included two patients with desmoplastic medulloblastomas (13-year-old female, 65 Gy), (11-year-old male, 54 Gy) and a patient with grade II oligodendroglioma treated with 30 Gy. A male patient received low-dose radiotherapy for chronic otitis at 10 years old. Histopathological examinations revealed the following: 1) fibroblastic-grade I, Ki-67 2%–3%, 25.5 years latency; cerebellopontine angle, 2) atypical meningioma grade II, Ki-67 8%, 21 years, frontal; and 3) transitional grade I, Ki-67 3%–4%, 11 years, frontal. The fourth patient had three radiation-induced meningiomas and 27 radiation-induced cavernomas, and was treated using a gamma knife. The mean follow-up period was 34.8±39.4 months. One patient had rhinorrhea and another experienced a cerebrospinal fluid fistula. Both underwent an additional operation. The former died because of meningitis on postoperative day 31. CONCLUSION: Most radiation-induced meningiomas are low-grade, but they have a high trend of recurrence. Close follow-up and yearly magnetic resonance imaging would minimize the morbidity rate. To reduce fatal complications, surgery should be planned in conjunction with plastic surgeons.Publication Metadata only Primary Intracranial Germinomas: Retrospective Analysis of Five Cases.(2018-01-01T00:00:00Z) Abdallah, ANAS ABDELRAHIM SA; ASILTÜRK, M; UYSAL, ML; EMEL, E; ABDALLAH, BG; BILGIC, B; GUNDOGDU, G; ABDALLAH, ANAS ABDELRAHıM SAPublication Metadata only Non-traumatic myositis ossificans in the lumbar spine.(2014-10-01T00:00:00Z) Abdallah, ANAS ABDELRAHIM SA; GOKCEDAG, A; OFLUOGLU, AE; EMEL, E; ABDALLAH, ANAS ABDELRAHıM SAPublication Metadata only Long-term Surgical Outcomes of Spinal Schwannomas: Retrospective Analysis of 49 Consecutive Cases.(2017-01-01T00:00:00Z) EMEL, E; Abdallah, ANAS ABDELRAHIM SA; SOFUOGLU, OE; OFLUOGLU, AE; GUNES, M; GULER, B; BILGIC, B; ABDALLAH, ANAS ABDELRAHıM SAPublication Unknown Clinical outcomes of multiple aneurysms microsurgical clipping: Evaluation of 90 patients.(2018-01-01) ASILTÜRK, M; Abdallah, ANAS ABDELRAHIM SA; ABDALLAH, ANAS ABDELRAHıM SA