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Öğe Bilateral elastofibroma dorsi: Role of MR imaging in diagnosis(2005) Yilmaz, Sevda; Kendi, Ayşe Tuba K.Elastofibroma dorsi is slow growing, solid but ill defined, uncommon soft tissue lesion that appears in elderly individuals as a mass in the chest soft tissues, most commonly found in the periscapular region. The tumor is typically unilateral, although bilateral involvement has been reported. It is a benign chest wall lesion that is not well known to radiologists. This diagnosis is often missed prospectively. To our knowledge, there is a limited number of papers of CT and MRI findings of elastofibroma dorsi in the literature. If the radiologist is aware of this uncommon benign fibrous pseudotumor, radical or unnecessary surgery may possibly be prevent. CT and MRI appearances in a 56-year-old woman with bilateral elastofibroma dorsi are presented to alert physicians to this entity in this paper. © 2005 Elsevier Ireland Ltd. All rights reserved.Öğe Changes of normal appearing optic nerve head on diffusion-weighted imaging in patients with diabetic retinopathy(Elsevier Science Inc, 2017) Yilmaz, Sevda; Yumusak, Erhan; Burulday, VeyselPurpose: To investigate whether there is any change by measuring ADC values particularly of the optic nerve head (ONH) in patients with diabetic retinopathy (DR). Material and methods: ADC values at the ONHs was measured in 56 patients and 68 controls. Results: ADC values of ONHs were significantly higher in patients with DR compared to controls (p = 0.011). ADC values in patients with macular edema were higher than those without macular edema (p = 0.017). Conclusion: DWI of ONHs can be useful in cases where it is difficult to assess macular edema during fundus examination, especially in diabetic patients with cataract. (C) 2016 Elsevier Inc. All rights reserved.Öğe Comparing 1470-and 980-nm diode lasers for endovenous ablation treatments(Springer London Ltd, 2015) Aktas, Aykut Recep; Celik, Orhan; Ozkan, Ugur; Cetin, Mustafa; Koroglu, Mert; Yilmaz, Sevda; Oguzkurt, LeventThe purpose of this study was to compare the effectiveness of 1470- and 980-nm lasers with regard to power output, complications, recanalization rates, and treatment response. We prospectively evaluated the effectiveness of endovenous laser ablation (EVLA) in a total of 152 great and small saphenous veins from 96 patients. Lasers were randomly used based on the availability of the units. Patients were clinically evaluated for Clinical Etiologic Anatomic Pathophysiologic (CEAP) stage and examined with Doppler ultrasound. Treatment response was determined anatomically by occlusion of the vein and clinically by the change in the venous clinical severity score (VCSS). Seventy-eight of the saphenous veins underwent EVLA with a 980-nm laser and 74 underwent EVLA with a 1470-nm laser. Treatment response was (68) 87.2 % in the 980-nm group and (74) 100 % in the 1470-nm group (p = 0.004). The median VCSS decreased from 4 to 2 in the 980-nm group (p < 0.001) and from 8 to 2 (p < 0.001) in the 1470-nm group. At 1-year follow-up, seven veins treated with 980 nm and two veins treated with 1470 nm were recanalized (p = 0.16); the average linear endovenous energy density (LEED) was 83.9 (r, 55-100) J/cm and 58.5 (r, 45-115) J/cm, respectively (p < 0.001). Postoperative minor complications occurred in 23 (29.4 %) limbs in the 980-nm group and in 19 (25.6 %) limbs of the 1470-nm group (p = 0.73). EVLA with the 1470-nm laser have less energy deposition for occlusion and better treatment response.Öğe Do cerebral blood flow velocities change in iron deficiency anemia?(Lippincott Williams & Wilkins, 2007) Aliefendioglu, Didem; Yilmaz, Sevda; Misirlioglu, Emine Dibek; Saygi, Semra; Özdoğan, Selver; Koçak, ÜlkerInfants with iron deficiency had lower scores when tested for mental and motor development than their peers with better iron status. The aim of this study was to examine cerebral blood flow velocity in infants with iron deficiency anemia. Thirty-six infants (27 male, 9 female) with iron deficiency anemia, aged 6 to 36 months were divided into 2 groups according to the hemoglobin (Hb) values [group 1 (n = 23) Hb < 10 g/dL and group 2 (n = 13) 11 > Hb >= 10g/dL]. In anterior and middle cerebral arteries only end-diastolic velocity (EDV) was increased in group 1 as compared with group 2 (P = 0.05 and P = 0.016, respectively), whereas in posterior cerebral artery both EDV and peak-systolic velocity were different between the groups (P = 0.024 and P = 0.004). Both peak-systolic velocity and EDV showed significant correlation with Hb level in the posterior cerebral artery (r = -0.38, P = 0.023 and r = - 0.35, P = 0.037) but not in the anterior and middle cerebral arteries. Increased cerebral blood flow velocities in children with lower Hb values may be due to increased cardiac output, decreased vascular resistivity caused by anemia.Öğe Erratum: MR spectroscopy of cervical spinal cord in patients with multiple sclerosis (Neuroradiology (2004) (s0023400412707) (10.1007/s00234-004-1231-1)(2004) Kendi, Ayşe Tuba K.; Tan, Funda U.; Kendi, Mustafa; Yilmaz, Sevda; Huvaj, Sinef; Tellioğlu, Serdar[No abstract available]Öğe Erratum: Surface landmarks of brachial plexus: Ultrasound and magnetic resonance imaging for supraclavicular approach with anatomical correlation (European Journal of Ultrasound 13 (3) (2001) (191-196)(2002) Apan, Alparslan; Baydar, Şenol; Yilmaz, Sevda; Uz, Aysun; Tekdemir, İbrahim; Güney, Şefik; Elhan, Alaittin[No abstract available]Öğe Evaluation of Changes in Cerebral Structures in Migraine Patients with Diffusion and Perfusion MRI(Turkish Neurological Soc, 2013) Erdemoglu, Ali Kemal; Ocaklilar, Ebru Kocacikli; Yilmaz, SevdaObjective: The purpose of this study is to determine ischemic lesions throughout the brain parenchyma in patients diagnosed with migraine with magnetic resonance (MR) diffusion technique, evaluate vascular architecture and possible abnormalities with MR perfusion technique and to compare these values with healthy individuals within a similar age group. Material and Method: A total of 45 migraine patients in interictal period (19 patients were diagnosed with migraine with aura) with ages between 19 and 70 (mean age 37.89 +/- 12.138) and 21 healthy volunteers with ages between 24 and 62 (mean age 36.95 +/- 13.77) were included in the study. Conventional MRI, diffusion and perfusion MRI scans were obtained. Results: Hyperintense ischemic foci were found in 35.6% of the patients. These lesions were scattered throughout the whole brain parenchyma, with more intensity at corona radiata and the frontal lobe. No pathologic findings were found in diffusion- weighted images and there were no significant differences in ADC values between the patients and the control group (p> 0.05). MR perfusion studies in migraineurs demonstrated a decrease in Cerebral Blood Flow (rCBF), prolonged Mean Transit Time (MTT) and Time to Peak (TTP) at occipital cortex, prolonged TTP at occipital white matter, centrum semiovale, cerebellum, bilateral pons, bitemporal white matter and thalamus, decreased rCBF and prolonged MTT at bilateral corona radiata, prolonged MTT at right frontal white matter, prolonged MTT and decreased rCBF and Cerebral Blood Volume (rCBV) at cerebellar cortex. Discussion: In migraine patients, changes in cerebral vascular structures that occur as a consequence of physiopathological events during interictal periods can be evaluated with MR perfusion and MR diffusion. Further studies comparing both ictal and interictal periods are required to confirm these findings.Öğe High-resolution computed tomography findings in elderly patients with asthma(Elsevier Ireland Ltd, 2006) Yilmaz, Sevda; Ekici, Aydanur; Ekici, Mehmet; Keleş, HaticeObjective: Based on the hypothesis that airway remodelling is related to the duration of asthma, HRCT scanning should show greater abnormalities in the early-onset than the late-onset asthmatics. It was, therefore, intended to assess the presence and the frequency of airway and parenchymal abnormalities with high-resolution computed tomography (HRCT) in elderly asthmatic patients, and to determine whether these abnormalities are related to the duration of asthma. Patients and methods: Sixty-eight clinically stable asthmatic patients aged >= 60 yr were included in this prospective study. The patients were separated into two groups according to the duration of symptoms as late-onset asthma (n = 3 1) with disease duration of < 5 yr, and early-onset asthma (n = 37) with disease duration of >= 5 yr. All patients were lifelong non-smoker and had been using inhaled beta agonists and inhaled steroids. HRCT-scanning and histamine inhalation test were performed on all patients. Results: In comparison with late-onset asthmatic patients, those with early-onset asthma had significantly higher frequency of emphysema (21.6% versus 0.0%, p=0.006), bronchial dilatation (13.9% versus 0.0%, p=0.03) and bronchial wall thickness (41.7% versus 12.9%, p=0.01). Multiple logistic regression analysis identified that early-onset of disease was an independent risk factor for the presence of irreversible HRCT-scan abnormalities in elderly asthmatics [odds ratio (OR): 9.4 (2.7-32.7),p=0.00001]. Conclusion: Present data suggest that HRCT abnormalities in early-onset elderly asthmatics reflect parenchymal and airway changes that become irreversible throughout the long course of the disease. (c) 2006 Elsevier Ireland Ltd. All rights reserved.Öğe Interobserver Agreement in the Analysis of Different Radiological Classifications of COVID-19 on Computed Tomography(Galenos Publ House, 2021) Ozdemir, Adnan; Yilmaz, Sevda; Erol, Ozlem Ozluk; Kaygusuz, Sedat; Goncuoglu, Alper; Erkmen, Selmin Perihan Komurcu; Karahan, IrfanIntroduction: Computed tomography (CT) has approximately 98% sensitivity for Coronavirus disease-2019 (COVID-19). Various algorithms were designed using CT images. However, the interobserver agreement of different radiological classifications of COVID-19 is not yet known. Thus, this study aimed to investigate the interobserver agreement of different radiological classifications of COVID-19. Materials and Methods: This study included 212 patients who were positive on the polymerase chain reaction test and eligible for CT. Four radiologists examined all CT images simultaneously. They reached a consensus that CT images can provide definite findings of COVID-19. The Radiological Society of North America (RSNA) consensus statement, the British Society of Thoracic Imaging (BSTI) structured reporting statement, and COVID-19 Reporting and Data System (CO-RADS) were used. Fleiss' Kappa was used to detect interobserver agreement. Kappa values of 0.000.20 were considered as slight, 0.21-0.40 as fair, 0.41-0.60 as moderate, 0.61-0.80 as substantial, and 0.81-1.00 as near-perfect agreement, and p<0.05 was accepted as significant. Results: A total of 137 patients did not have any pathological CT findings. The most prevalent radiological findings were ground-glass opacities and consolidations. The agreements on all classifications were at near-perfect levels: RSNA, 0.86 (0.82-0.90); BSTI, 0.83 (0.79-0.87), and CO-RADS, 0.82 (0.79-0.86). The RSNA classification has the highest consistency rate, followed by BSTI and CO-RADS. However, substantial and moderate agreements were found in the subcategories of each classification. Conclusion: In this study, some subcategories had a lower agreement, despite the high consistency rates for COVID-19 radiological classification systems in the literature. Therefore, improving the items without consensus can lead to the development of better radiological diagnostic approaches.Öğe Klinefelter Syndrome with Portal Vein Aneurysm: Case Report(Gazi Univ, Fac Med, 2018) Sari, Isilay Kalan; Cosar, Ramazan; Yilmaz, Sevda; Demirci, HuseyinKlinefelter syndrome (KS) is the most common chromosomal disorder in men characterized by clinical features of hypogonadism and infertility. About 90% of cases have classically 47, XXY karyotype and the remaining have additional X or Y chromosomes, high grade aneuploidies or X chromosome structural abnormalities. Portal vein aneurysms are very rare. Reported cases are increasing due to use of modern imaging techniques in clinic practise. Here we report a 19-year-old man with KS who was admitted with complaints of abdominal pain, nausea and vomiting. Further investigations revealed 23 mm anechoic, saccular expansion in the left branch of the portal vein. It is well known that KS is associated with venous thromboembolic diseases including portal venous thrombosis, but association with portal vein aneurysm has not been previously reported.Öğe Pulmonary Embolism: Cardiovascular And Parenchymal Changes(Derman Medical Publ, 2017) Aktas, Aykut Recep; Senocak, Eda; Cetin, Meltem; Yilmaz, Sevda; Celik, Ahmet Orhan; Demirtas, Hakan; Callioglu, MehmetAim: To investigate the effects and the severity of pulmonary embolism on the cardiovascular system and lung parenchyma. Material and Method: Pulmonary artery (PA) obstruction index ratios were calculated, and cardiovascular and pleuroparenchymal changes were retrospectively assessed in 180 patients with a prediagnosis of PE using computerized tomography pulmonary angiography (CTPA). Results: Main PA, right PA, and mean superior vena cava (VCS) diameters, right (RV) and left ventricle (LV) short diameters, and RV/LV ratios in patients with PE were increased (p<0.001, p=0.004, p=0.007, p=0.01, p=0.001, respectively) and correlated with the obstruction index ratio (OIR). Also, the convexity of the interventricular septum, VCI, and vena azygos reflux frequency were increased with PE (p<0.001, p=0.001, p=0.001) and with massive PE (p<0.001, p=0.003, p<0.001). It was determined that the frequency of the presence of wedge-shaped opacities and vein mark findings was increased in patients with PE (p<0.001, p<0.001); however, it was found less frequently in patients with massive PE when compared to the submassive patients (p=0.002, p=0.014). The presence of atelectasis was not different between patients with and without PE; consolidation, ground glass appearance, oligemia frequency, and the average scores were increased in the patients with PE (p=0.02, p<0.001, p=0.001), and there was a positive correlation between the oligemia score and OIR (r=0.202, p=0.027). Pleural effusion was infrequent with PE. Discussion: CTPA is a rapid and reliable method for the determination of the severity of PE, affected vascular structures and lung regions, and for the assessment of right heart function.
