Mehmet Bülent Onal

Hacettepe University, Ankara, Ankara, Turkey

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Publications (11)11.93 Total impact

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    ABSTRACT: Acute epidural hematomas resulting from traumatic brain injury remain among the most common causes of mortality and disability. In the literature, there are cases about the resolution and recurrence of spinal epidural hematomas. This case is characterized by the rapid disappearance and re-formation of an acute cranial epidural hematoma (EDH) associated with no overlying skull fracture. Various authors have reported resolution of EDHs managed conservatively, but rapid resolution and recurrence of cranial EDH was not reported before.
    Ulusal travma ve acil cerrahi dergisi = Turkish journal of trauma & emergency surgery: TJTES 11/2012; 18(6):524-6. · 0.34 Impact Factor
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    ABSTRACT: Bilateral traumatic hemorrhage of the basal ganglia is an extremely rare neuropathologic entity. Bilateral basal ganglia hemorrhage secondary to blast injury has not described before. We report a case with bilateral basal ganglia hemorrhage secondary to explotion.
    Ulusal travma ve acil cerrahi dergisi = Turkish journal of trauma & emergency surgery: TJTES 09/2012; 18(5):461-2. · 0.34 Impact Factor
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    ABSTRACT: We present here a case of primary choroid plexus T-cell lymphoma with no evidence of immunodeficiency or immunological disease. As ventricular T-cell lymphoma is extremely rare, there is only limited information on the radiological findings of ventricular T-cell lymphoma. In this report, we also include some unusual MRI findings in this case that have never been described before.
    Journal of Neuroradiology 06/2011; 39(2):116-8. · 1.24 Impact Factor
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    ABSTRACT: despite the years of study on it, cerebral vasospasm following subarachnoid hemorrhage is still an important cause of mortality and morbidity. The presented study was undertaken to show whether phosphodiesterase inhibitor tadalafil can attenuate the vasospasm process following subarachnoid bleeding. in this study, 20 male New Zealand White rabbits weighing 2,500-3,000 g were randomly assigned to four groups. Animals in group 1 were controls. In group 2, animals were given oral tadalafil at 12, 24 and 36 h and SAH was not induced. SAH induced animals in group 3 did not receive any medication. In group 4, animals received tadalafil at 12, 24 and 36 h after SAH induction. All animals were sacrificed via exsanguination at 48 h after induction of SAH. Brains and brainstems with overlying basilar arteries were removed and stored in fixative at +4°C overnight. Basilar arteries were sectioned from four separate zones, and four sections were obtained from each rabbit. Basilar artery luminal section areas were measured by using SPOT for Windows version 4.1. Statistical comparisons were performed using Kruskal Wallis and ANOVA tests. the SAH induced group which had been treated with tadalafil had significantly greater basilar artery luminal area than the untreated group (p < 0.05). There was no significant difference between control group and non-SAH induced group in terms of luminal areas. tadalafil has a potentially preventive effect in treatment of cerebral vasospasm following subarachnoid bleeding.
    Acta neurochirurgica. Supplement 01/2011; 110(Pt 2):13-6.
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    ABSTRACT: Non-neoplastic intramedullary spinal lesion cases are rarely seen in the literature. We would like to present this case for differential diagnosis of intramedullary spinal tumors. The aim of this case report is to attract attention on the MRI findings with lack of contrast enhancement and long syrinx formation which differs these types of lesions from the intramedullary spinal tumors. Intraoperative, pathological and immunohistochemical findings of non-neoplastic intramedullary spinal lesion were discussed.
    European Spine Journal 07/2010; 19 Suppl 2:S169-73. · 2.47 Impact Factor
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    ABSTRACT: Radial nerve is the most frequently injured major nerve in the upper extremity. Proximal part of the radial nerve involvement can result from a humerus fracture, direct nerve trauma, compression and rarely from tumors. The aim of the study is to determine the clinical characteristics and electrodiagnostic findings in patients with proximal radial nerve injuries, and also the outcome of surgical treatment. The study subjects included 46 patients with radial nerve injuries seen between June 2000 and June 2008 at our hospital. The analysis included demographics, clinical features, etiology, pre-and postoperative EMNG (Electromyoneurography) findings. Surgical decompression resulted in neurological improvement in patients with radial entrapment neuropathies. Good neurological recovery was observed from decompression of callus of old humeral fracture. The worst results were observed in the direct missile injuries of the radial nerve. A detailed clinical and electrodiagnostic evaluation is of importance in patients with radial nerve injury to ensure an appropriate treatment. The choice of treatment, conservative or surgical, depends on the clinical presentation and the type of injury.
    Neurology India 01/2010; 58(2):230-4. · 1.04 Impact Factor
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    ABSTRACT: We report a case of pituitary apoplexy occurring in a 74-year-old patient 6 hours after cardiac surgery. The patient presented with confusion, unilateral ptosis and ophthalmoplegia. Neurological examination revealed right oculomotor nerve palsy and decreased level of consciousness. Magnetic resonance imaging showed a hemorrhagic and necrotic pituitary macroadenoma. After prompt endocrinological replacement therapy with hydrocortisone and levothyroxine, the confusion of the patient resolved. Removal of a non-functional macroadenoma with large necrotic areas resulted in full recovery. The physician should be aware of pituitary adenoma infarction after open cardiac surgery and should remember that it can be fatal or cause permanent neurological or endocrine damage without proper treatment. Surgical and endocrine treatment can be life-saving procedures.
    Neurologia i neurochirurgia polska 01/2010; 44(5):520-5. · 0.49 Impact Factor
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    ABSTRACT: The retrosigmoid approach is a common route to the cerebellopontine angle and lateral clivus. Patient's head positioning just before the operation is crucial to perform the procedure effectively and safely. The aim of the study is to determine the positional angle of the head on preoperative axial sequences of the cranial magnetic resonance imaging (MRI). The angle between the line drawn along the petrous bone ventral to the internal auditory canal and the line drawn parallel to the dorsal face of the clivus on the axial view of MRI sequences was measured. This method of patient positioning has resulted in minimal cerebellar retraction, less time in the preoperative preparation period and less postoperative headache and neck pain. This method can provide quick and better exposure of the cerebellopontine angle. Preoperative measurement of positional angle on axial MRI sequences is a very simple and sufficient way to determine the angle of the head that is turned to the contralateral side.
    Neurology India 01/2009; 57(6):777-9. · 1.04 Impact Factor
  • Burçak Bilginer, Mehmet Bülent Onal, Kader K Oguz, Nejat Akalan
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    ABSTRACT: Arachnoid cysts are usually found incidentally and are generally asymptomatic. They are thought to be developmental anomalies, and their etiology is unknown. Some complications such as subdural hematoma, subdural hygroma, and intracystic bleeding can occur after minor traumas. Here, we report three cases. Case 1 has subdural hematoma associated with subdural hygroma, case 2 has subdural hematoma after a birth delivery, and case 3 has intracystic bleeding associated with subdural hematoma. We suggest to treat the complicating event in our patients and have chosen burr-hole evacuation for treatment.
    Child s Nervous System 11/2008; 25(1):119-24. · 1.24 Impact Factor
  • Journal of Neurosurgery 08/2008; 109(1):166. · 3.15 Impact Factor
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    ABSTRACT: A 1-day-old boy with the characteristics of Adams-Oliver syndrome was presented. Adams-Oliver syndrome has a wide spectrum of anomalies ranging from aplasia cutis congenita, cutis marmorata telangiectatica congenita and transverse limb defects to lethal anomalies. Our patient had aplasia cutis congenita with scalp, skull and dura defect. He had also a large dura defect with herniation of brain tissue. Besides these he had bilateral clubfoot, cortical fissure and nail hypoplasia in the hands, scrotal hyperpigmentation and generalized cutis marmorata telangiectatica congenita. He was operated on the 3rd day of life. The herniated brain tissue was resected and the dura was repaired with a synthetic dural graft.
    Turkish neurosurgery 02/2008; 18(2):191-3. · 0.58 Impact Factor