Publications by authors named "Bahattin Hakyemez"

The postpartum period is a well-defined risk factor for cerebral venous sinus thrombosis (CVST). However, it is unclear which patients are at risk for CVST in the postpartum period. Thus, determining some CVST risk factors in postpartum patients may be useful for preventing the disorder in this population.

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Objectives: Basilar artery atherosclerotic plaque is the predominant cause of stroke in the posterior circulation. İscheamic stroke caused basilar artery atherosclerosis faces a high risk of recurrence despite optimal medical treatment, which might lie in the less than ideal recognition of underlying stroke mechanism and lack of individualized treatment for strokes of different mechanisms. We aim in this study to investigate the effect on stroke mechanism, stroke recurrence and clinical outcome in stroke patients with basilar artery atherosclerosis.

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Objectives: There is evidence that the inflammatory demyelinating disorder in Multiple Sclerosis (MS) is associated with acute seizures and epilepsy. Additionally, the likelihood of developing epilepsy increases with neurodegeneration. This study aims to reveal the clinical and radiological features of MS-epilepsy/seizure coexistence.

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Article Synopsis
  • Flow diverter (FD) stents are used to treat giant aneurysms by minimizing blood flow, but they can complicate the treatment when nearby arteries, like the ophthalmic artery (OA), get occluded.
  • This study examined two types of FD stents, FRED4017 and FRED4518, focusing on how their differing effective metal surface area (EMSA) values influence occlusion in the OA.
  • Results showed that FRED4017, with higher EMSA at the aneurysm neck, caused more occlusion in the OA compared to FRED4518, suggesting that choosing stents with lower EMSA values at the OA inlet may reduce risks for patients with nearby jailed arteries.
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Background: Many different pathologies may underlie tumefactive demyelinating lesions. Identifying clinical and radiologic distinguishing features before pathologic examination is essential for diagnosis and treatment. In this study, we aimed to determine the clinical and radiologic features affecting the etiology and disease course of patients with tumefactive lesions (TDL).

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Objectives: Cerebral venous sinus thrombosis (CVST) is a cerebrovascular disease characterized by thrombosis of the cerebral venous or dural sinuses. Autoimmune diseases (AD) are important causes of CVST. This study aims to reveal the differences between CVST associated with autoimmune diseases compared with other causes (OCs) and Behcet's syndrome (BS) compared with other ADs.

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Background: Percutaneous biliary drainage is a frequently used method to provide biliary decompression in patients with biliary obstruction.

Purpose: To investigate the between drainage type and infection risk in patients treated with internal-external and external biliary drainage catheterization for malignant biliary obstruction.

Material And Methods: A total of 410 patients with malignant biliary obstruction who underwent internal-external or external biliary drainage catheterization between January 2012 and October 2016 were retrospectively evaluated.

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Aim: To evaluate the safety and efficacy of flow diverter stents (FDSs) for treating remnant or recurrent intracranial aneurysms that were treated surgically.

Material And Methods: The patients who were treated with FDSs due to remnant or recurrent intracranial aneurysms after microsurgery were included in the study. The patients' demographics, treatment histories, aneurysm features, complications associated with flow diversion, and neurological and angiographic follow-up findings were evaluated.

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Background: Cerebral venous sinus thrombosis (CVST) is not as well understood as an ischemic stroke of arterial origin. Although the prognosis of CVST is usually good, parenchymal lesions may occur in some patients, and the development of intracranial herniation may result in death. For this reason, recognizing the risk factors for intracranial herniation and accurately determining those patients who should undergo decompressive craniectomy is important.

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Coronavirus disease 2019 (COVID-19) is a procoagulant disease that increases the risk of clinically evident thrombotic complications. Herein we present 3 cases with different retinal artery occlusions that emerged soon after the diagnosis of COVID-19. The first patient had central retinal artery occlusion (CRAO) that resulted in visual loss in one eye.

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Background: Flow diverter stents (FDSs) are widely used to treat aneurysms in the clinic. However, even the same flow diverter (FD) use on different patients' aneurysm sites can cause unexpected hemodynamics at the aneurysm region yielding low success rates for the overall treatment. Therefore, the present study aims to unfold why FDs do not work as they are supposed to for some patients and propose empirical correlation along with a contingency table analysis to estimate the flow stasis zones in the aneurysm sacs.

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The reported experience with preoperative embolization of solid orbital tumors is scarce. Herein, we present a case of a large and hypervascular orbital solitary fibrous tumor (SFT) in which 500-700 µm tris-acryl gelatin microspheres (TAGM) were used for preoperative embolization. A 41-year-old man presented with severe proptosis, palpable mass, restrictive myopathy, exposure keratopathy, and compressive optic neuropathy in the right orbit.

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Objective: To evaluate the clinical and radiological results of lumbar accessed catheter-assisted epidural blood patch (LACA-EBP) technique in treatment of spontaneous intracranial hypotension secondary to cervicothoracic cerebrospinal fluid leakage.

Methods: Patients presenting with spontaneous intracranial hypotension where magnetic resonance imaging cisternography confirmed and localized the cerebrospinal fluid leakage at cervicothoracic levels were treated with LACA-EBP. Visual analog scale (VAS) score for headache at baseline, third day after treatment, and during long-term follow-up was used to assess the treatment response.

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Objectives: Central venous sampling (CVS) with corticotropin-releasing hormone (CRH) stimulation is a crucial technique in evaluating adrenocorticotropic hormone (ACTH)-dependent Cushing's syndrome (CS). We evaluated central venous sampling (CVS) and magnetic resonance imaging (MRI) findings in predicting the localization and lateralization of pituitary microadenomas.

Methods: We analyzed 29 patients with CS who underwent CVS with CRH stimulation and examined with MRI retrospectively.

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Purpose: To investigate possible relationships between the presence and location of arterial transit artifacts (ATA) and clinical symptoms, digital subtraction angiography (DSA), and dynamic susceptibility contrast (DSC) perfusion imaging abnormalities in patients with carotid artery stenosis (CAS).

Methods: Forty-seven patients who underwent arterial spin labeling (ASL) and DSC perfusion imaging in the same period diagnosed with > 50% unilateral internal carotid artery (ICA) stenosis by DSA performed 24 h after perfusion imaging were included. The presence of ATA, localization and hypoperfusion were evaluated using ASL interpretation.

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Objective: To examine the clinical outcome of Enterprise stent in patients with severe and symptomatic intracranial atherosclerosis.

Material And Method: Twenty-five patients who underwent Enterprise stenting between January 2012 and March 2019 were included in this study. Exclusion criteria were previous intracranial stenting and inadequate follow-up.

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Anticoagulants are prescribed to the flow diverter treated patients to diminish the risk of embolism in the arteries. In the present study, digital subtraction angiography images of a 49-year-old female patient with a left paraophthalmic aneurysm were used to build a numerical model to investigate the effect of an anticoagulant on hemodynamics at the aneurysm site. The Carreau-Yasuda viscosity model was utilized to define blood viscosity, and the coefficients of the viscosity model were updated based on the usage of warfarin.

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Vertebral artery hypoplasia (VAH) is a frequent anatomical variation of vertebral arteries, with emerging evidence suggesting that it contributes to posterior circulation ischemia. However, the relationship between VAH and ischemic stroke remains unknown. Hence, this study aimed to determine the prevalence of VAH in patients diagnosed with acute ischemic stroke who were followed up in a neurology clinic and to determine if it can potentially be a risk factor for atherosclerotic stenosis in vertebrobasilar circulation.

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Ulegyria results from perinatal hypoxic-ischemic brain injury in term infants. The specific mushroom-shaped configuration of ulegyria results from small atrophic circumvolutions at the bottom of a sulcus underlying an intact gyral apex. Clinically, ulegyria is generally associated with epilepsy.

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Objective: To investigate the shape differences in the putamen of early-onset Parkinson's patients compared with healthy controls and to assess and to assess sub-regional brain abnormalities.

Methods: This study was conducted using the 3-T MRI scans of 23 early-onset Parkinson's patients and age and gender matched control subjects. Landmark coordinate data obtained and Procrustes analysis was used to compare mean shapes.

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In this article, we present a case of leptomeningeal pneumocephalus and pneumorrhachis secondary to pneumothorax that occurred six years after syringopleural shunting.

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Purpose: Giant prolactinomas, which have extremely large sizes and high prolactin (PRL) values, are rarely seen. Although medical therapy is effective, surgical treatment is more frequently applied due to slightly lower response rates and compression symptoms. This study aimed to compare the medical and surgical treatment results in giant prolactinomas.

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Purpose: The main goal is to evaluate the effectiveness of angioseal and starclose vascular closure devices (VCDs) in high-risk patients under intensive anticoagulation who require therapeutic angiographic procedures and to discuss which factors are important in complications associated with VCDs.

Materials And Methods: Medical records of the patients who underwent therapeutic complex interventional vascular procedures were reviewed retrospectively. One hundred sixty-six patients were divided into two groups regarding VCDs used for access-site closure after the procedure: group 1, (angioseal); group 2, (starclose).

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Objective: To assess vascular opacifications, the efficiency, and interobserver agreement (IOA) of five different computed tomography angiography (CTA) brain death (BD) scoring systems in patients with and without cranial interventions, for determining alternative findings correctly supporting BD diagnosis by CTA even in cranial intervention presence.

Methods: 45 patients clinically identified with BD and evaluated with CTA were included. IOA of five different scoring systems used for CTA BD diagnosis, the effect of intracranial interventions on scoring systems, and vascular opacification were evaluated.

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