Person: HAKYEMEZ, BAHATTİN
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HAKYEMEZ
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BAHATTİN
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Publication Direct aspiration thrombectomy experience with the SOFIA 6F catheter in acute ischemic stroke(Springer, 2021-01-19) Bilgin, Cem; Durmuş, Yavuz; Haki, Cemile; Nas, Ömer Fatih; Hakyemez, Bahattin; NAS, ÖMER FATİH; HAKYEMEZ, BAHATTİN; Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı; 0000-0002-3425-0740; AAG-8561-2021; AAI-2318-2021Introduction As the SOFIA (Soft torqueable catheter Optimized For Intracranial Access) 6F catheter has a large luminal diameter, it can be used as an aspiration catheter. Furthermore, it may function as an intermediate catheter when a stent retriever is required. Purpose We aimed to evaluate the usefulness of the SOFIA 6F catheter in mechanical thrombectomy with the direct aspiration first pass technique.Method Patients who had undergone mechanical thrombectomy (September 2017-January 2019) using the SOFIA 6F catheter in two centers were retrospectively analyzed. We used the thrombolysis in cerebral infarction (TICI) scale to evaluate the success of recanalization. National Institutes of Health Stroke Scale scores on admission and discharge were used together with the modified Rankin Scale (mRS) scores at 90 days.Results In 132 (89.1%) of the 148 cases, the thrombus was in the anterior system. The SOFIA 6F catheter reached the thrombus site in 130 (87.8%) cases. The rate of successful recanalization (TICI >= 2b) was 89.1%. The targeted clinical outcome (mRS score <= 2 at 90th days) was achieved in 49.3% of cases. Symptomatic intracranial hemorrhage occurred in 5.4%. The rate of emboli to new vascular territories was 5.4%. Mortality was 14.1%.Conclusion In the majority of our cases, the SOFIA 6F catheter provided effective and rapid recanalization with aspiration thrombectomy.Publication Castleman's disease: Unilateral cervical involvement and imaging findings a case report(Sage Publications Inc, 2007-06-01) Atahan, S.; Hakyemez, B.; Doğan, Nurullah; HAKYEMEZ, BAHATTİN; Topal, N. B.; BOLCA TOPAL, NAİLE; Parlak, M.; PARLAK, MÜFİT; Bursa Uludağ Üniversitesi/Tıp Fakültesi; 0000-0003-1455-6918; AAI-2327-2021; AAI-2318-2021; AAG-8521-2021Castleman's disease is an idiopathic lymphoproliferative disorder characterized by massive enlargement of lymph nodes. It may have a unifocal or multifocal presentation; the mediastinum is the most common site (70%). Patients with cervical disease usually have unifocal involvement (90%). The main problem posed by cervical Castleman's disease is that it should be considered in the differential diagnosis of cervical tumors. This report describes a patient who had unifocal Castleman's disease on the left side of the neck, and discusses the differential diagnosis with findings on magnetic resonance imaging, computed tomography and ultrasonography.Publication Non-contrast magnetic resonance venography with inhance 3D Velocity: Diagnostic performance for intracranial venous thrombosis(Springer, 2021-04-06) Özpar, Rifat; Tonkaz, Mehmet; Erkal, Duygu; Öngen, Gökhan; Hakyemez, Bahattin; ÖZPAR, RİFAT; TONKAZ, MEHMET; ERKAL TONKAZ, DUYGU; ÖNGEN, GÖKHAN; HAKYEMEZ, BAHATTİN; 0000-0001-6649-9287; 0000-0002-8201-1568; 0000-0002-3425-0740; AAH-5062-2021; DZJ-5260-2022; EUK-9600-2022; FQR-8472-2022; AAI-2318-2021Purpose The aim of this study was to evaluate the diagnostic performance of Inhance 3D Velocity (I3DV) in intracranial venous thrombosis and investigate the possible impact of venous sinus hypoplasia/aplasia on false thrombosis diagnosis made with I3DV. Methods This study included 540 patients. Contrast-enhanced magnetic resonance venography combined with conventional sequences was considered the gold standard test (GST), while I3DV was considered as diagnostic test. We accessed the diagnostic success of I3DV for intracranial venous thrombosis detection, thrombosed vessel identification, and total/partial thrombus distinction. The possible relationship between false-positive thrombus diagnosed by I3DV and venous sinus hypoplasia or aplasia diagnosed by GST was investigated. Results The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of I3DV in the detection of intracranial venous thrombosis were 95.7%, 92.1%, 64.1%, 99.3%, and 92.6%, respectively. A significant association was observed between I3DV and GST in terms of thrombosis detection and total/partial thrombus distinction (p < 0.001). A significant relationship was observed between false-positive thrombosis diagnosis in I3DV and hypoplasia in the left transverse sinus (p < 0.001). Conclusion Intracranial venous thrombosis may be diagnosed faster and more accurately than traditional phase contrast magnetic resonance angiography in I3DV. This technique can be used in situations where contrast medium application is contraindicated. As in other non-contrast magnetic resonance venography techniques, left transverse sinus hypoplasia can be diagnosed as a thrombosed vessel in I3DV.Publication Single-stage endovascular treatment in patients with severe extracranial large vessel stenosis and concomitant ipsilateral unruptured intracranial aneurysm(Türk Radyoloji Derneği, 2015-11-01) Kaçar, Emre; Nas, Ömer Fatih; Erdoğan, Cüneyt; Hakyemez, Bahattin; NAS, ÖMER FATİH; Erdoğan, Cüneyt; HAKYEMEZ, BAHATTİN; Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; 0000-0002-3425-0740; COE-1124-2022; AAI-2318-2021; AAG-8561-2021PURPOSEWe aimed to evaluate the safety and effectiveness of single-stage endovascular treatment in patients with severe extracranial large vessel stenosis and concomitant ipsilateral unruptured intracranial aneurysm.METHODSHospital database was screened for patients who underwent single-stage endovascular treatment between February 2008 and June 2013 and seven patients were identified. The procedures included unilateral carotid artery stenting (CAS) (n=4), bilateral CAS (n=2), and proximal left subclavian artery stenting (n=1) along with ipsilateral intracranial aneurysm treatment (n=7). The mean internal carotid artery stenosis was 81.6% (range, 70%-95%), and the subclavian artery stenosis was 90%. All aneurysms were unruptured. The mean aneurysm diameter was 7.7 mm (range, 5-13 mm). The aneurysms were ipsilateral to the internal carotid artery stenosis (internal carotid artery aneurysm) in five patients, and in the anterior communicating artery in one patient. The patient with subclavian artery stenosis had a fenestration aneurysm in the proximal basilar artery. Stenting of the extracranial large vessel stenosis was performed before aneurysm treatment in all patients. In two patients who underwent bilateral CAS, the contralateral carotid artery stenosis, which had no aneurysm distally, was treated initially.RESULTSThere were no procedure-related complications or technical failure. The mean clinical follow-up period was 18 months (range, 9-34 months). One patient who underwent unilateral CAS experienced contralateral transient ischemic attack during the clinical follow-up. There was no restenosis on six-month follow-up angiograms, and all aneurysms were adequately occluded.CONCLUSIONA single-stage procedure appears to be feasible for treatment of patients with severe extracranial large vessel stenosis and concomitant ipsilateral intracranial aneurysm.Publication Dissection of a non-bifurcating cervical carotid artery(Sage Publications Inc, 2016-06-01) NAS, ÖMER FATİH; Nas, Ömer Fatih; Karakullukçuoğlu, Zeynel; Hakyemez, Bahattin; HAKYEMEZ, BAHATTİN; Erdoğan, Cüneyt; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; AAI-2318-2021; AAM-1388-2021; AAG-8561-2021A non-bifurcating cervical carotid artery is a rare anomaly in the population. Radiologic diagnosis of pathologies seen together with this anomaly can be challenging. Despite not being diagnostic all the time, digital subtraction angiography is accepted as the gold standard method for the diagnosis of dissection. We present a case of a non-bifurcating cervical carotid artery and concomitant dissection, which presented to the hospital with trauma and ischemic findings.Publication Dynamic contrast-enhanced T1-weighted perfusion magnetic resonance imaging identifies glioblastoma immunohistochemical biomarkers via tumoral and peritumoral approach: A pilot study(Elsevier Science, 2019-04-09) Öztürk, Kerem; Soylu, Esra; Tolunay, Şahsine; Narter, Selin; Hakyemez, Bahattin; Özturk, Kerem; Soylu, Esra; TOLUNAY, ŞAHSİNE; NARTER, SELİN; HAKYEMEZ, BAHATTİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0001-9664-2347; 0000-0002-3425-0740; AAI-2318-2021; E-1228-2018; AAI-1612-2021; DSW-1175-2022; FOL-7699-2022OBJECTIVE: We aimed to evaluate the usefulness of dynamic contrast-enhanced T1-weighted perfusion magnetic resonance imaging (DCE-pMRI) to predict certain immunohistochemical (IHC) biomarkers of glioblastoma (GB) in this pilot study.METHODS: We retrospectively reviewed 36 patients (male/female, 25:11; mean age, 53 years; age range, 29-85 years) who had pretreatment DCE-pMRI with IHC analysis of their excised GBs. Regions of interest of the enhancing tumor (ER) and nonenhancing peritumoral region (NER) were used to calculate DCE-pMRI parameters of volume transfer constant, back flux constant, volume of the extravascular extracellular space, initial area under enhancement curve, and maximum slope. IHC biomarkers including Ki-67 labeling index, epidermal growth factor receptor (EGFR), oligodendrocyte transcription factor 2 (OLIG2), isocitrate dehydrogenase 1 (IDH1), and p53 mutation status were determined. The imaging metrics of GB with IHC markers were compared using the Kruskal-Wallis test and Spearman correlation analysis.RESULTS: Among 30 patients with available IDH1 status, 14 patients (46.6%) had IDH1 mutation. EGFR amplification was present in 24/36 (66.6%) patients. Mean Ki-67 labeling index was 29% (range, 1.5%-80%). p53 mutation was present in 20/36 GBs (55%), whereas OLIG2 expression was positive in 29/36 GBs (80.5%). Various DCE-pMRI parameters gathered from the ER and NER were significantly correlated with IDH1 mutation, EGFR amplification, and OLIG2 expression (P < 0.05). Ki-67 labeling index showed a strong positive correlation with initial area under enhancement curve (r = 0.619; P < 0.001).CONCLUSIONS: DCE-pMRI could determine surrogate IHC biomarkers in GB via tumoral and peritumoral approach, potential targets for individualized treatment protocols.Publication Association of brain volume and cognition in the chronic and episodic migraine patients(Sage Publications, 2013-06-01) Zarifoğlu, Mehmet; Şener, D. K.; Karlı, Nejdet; Hakyemez, Bahattin; Taşkapılıoğlu, Özlem; Özbek, Sevda Erer; Bakar, Mustafa; ZARİFOĞLU, MEHMET; Şener, D. K.; KARLI, HAMDİ NECDET; HAKYEMEZ, BAHATTİN; Taşkapılıoğlu, Özlem; ERER ÖZBEK, ÇİĞDEM SEVDA; BAKAR, HACI MUSTAFA; Uludağ Üniversitesi/Tıp Fakültesi/Nöroloji Bölümü; 0000-0003-4436-3797; AAI-2318-2021; AAK-6623-2020; EHN-5825-2022; IOZ-7564-2023; CXD-7623-2022; DLN-1836-2022; EKN-8251-2022Publication A rare cause of hypopituitarism: Pituitary tuberculosis(Aves, 2012-01-01) Gül, Özen Öz; Ertürk, Erdinç; Cander, Soner; Ünal, Oğuz Kaan; Hakyemez, Bahattin; İmamoğlu, Şazi; ÖZ GÜL, ÖZEN; ERTÜRK, ERDİNÇ; CANDER, SONER; Ünal, Oğuz Kaan; HAKYEMEZ, BAHATTİN; İmamoğlu, Şazi; Uludağ Üniversitesi/Tıp Fakültesi/Endokrinoloji ve Metabolizma Anabilim Dalı.; Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; AAI-1005-2021; AAI-2318-2021; AAJ-6536-2021; HUR-0563-2023; GGN-5983-2022; FCO-4676-2022Pituitary tuberculosis is a rare condition that can present with hypopituitarism even without any evidence of systemic tuberculosis and is easily confused with pituitary adenomas. Headache and hypopituitarism are the most common presenting symptoms. We report the case of pituitary tuberculosis in a 39-year-old male patient who presented with panhypopituitarism. Although it is rare and difficult to diagnose, pituitary tuberculosis should be considered in every nonfunctional sellar masses, especially in fairly small ones with unexpected hypopituitarism.Publication Spinal Type II arteriovenous malformation and endovascular treatment(Elsevier Science, 2015-06-01) Nas, Ömer Fatih; Büyükkaya, Ramazan; Erdoğan, Cüneyt; Hakyemez, Bahattin; NAS, ÖMER FATİH; Erdoğan, Cüneyt; HAKYEMEZ, BAHATTİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; 0000-0002-3425-0740; AAG-8561-2021; AAI-2318-2021; COE-1124-2022Publication Evaluation of recurrent vertebral hydatid cyst with computed tomography myelography in a case with spinal instrumentation(Elsevier Science, 2015-11-01) Sanal, Bekir; Nas, Ömer Fatih; Büyükkaya, Ramazan; Hacıkurt, Kadir; Hakyemez, Bahattin; NAS, ÖMER FATİH; Hacıkurt, Kadir; HAKYEMEZ, BAHATTİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Radyoloji Anabilim Dalı.; AAG-8561-2021; AAI-2318-2021; EWW-9360-2022