Browsing by Author "Arslan, Serdar"

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Can Strain Elastography Combined with Ultrasound Breast Imaging Reporting and Data System Be A More Effective Method in The Differentiation of Benign and Malignant Breast Lesions?
(2017) Arslan, Serdar; Uslu, Nihal; Ozturk, Funda Ulu; Akcay, Eda Yilmaz; Tezcaner, Tugan; Agildere, Ahmet Muhtesem; https://orcid.org/0000-0001-7984-4326; https://orcid.org/0000-0002-6733-8669; https://orcid.org/0000-0001-6831-9585; https://orcid.org/0000-0002-3641-8674; https://orcid.org/0000-0003-4223-7017; 28154989; AAH-9796-2019; ABC-5258-2020; AAK-1960-2021; AAD-9865-2021; AAB-5802-2020
To investigate whether a novel method that combines breast imaging reporting and data system (BI-RADS) with strain elastography contributes to diagnostic performance in differentiation of malignant and benign breast lesions. In 81 patients, 81 breast lesions were prospectively investigated. Breast lesions were separately evaluated with ultrasonography and strain elastography. While evaluations with ultrasonography were based on 2003 BI-RADS-US, strain elastography evaluations were based on a 5-point scale and strain ratio. Diagnostic performances of ultrasonography, strain elastography, and the combined method were compared. Among 81 lesions, 43 (53.1%) were benign and 38 (46.9%) were malignant. When a cutoff point of category 3 was used, sensitivity, specificity, positive and negative predictive values, and accuracy for BI-RADS were 100, 11.6, 50, 100, and 53%, respectively. When BI-RADS and strain ratio were combined, sensitivity, specificity, positive and negative predictive values, and accuracy were 89.5, 93, 91.9, 90.9, and 91.3%, respectively. When BI-RADS and elastography scores were combined, sensitivity, specificity, positive and negative predictive values, and accuracy were 86.8, 97.7, 97.1, 89.4, and 92.5%, respectively. The combination of strain elastography and BI-RADS was found to have better diagnostic performances to diagnose breast lesions than BI-RADS alone.
The Efficacy of Flow Diverter Stents in the Treatment of Wide-Necked Intracranial Aneurysms
(2017) Duman, Enes; Yildirim, Erkan; Ozdemir, Adnan; Arslan, Serdar; Aytekin, Cuneyt; Bovyat, Fatih; 0000-0002-9057-722X; F-4230-2011; ABI-3856-2020
Background: To present our findings obtained from the treatment of wide-necked intracranial neurysms with flow diverter stents. Patients and Methods: Intracranial aneurysms were determined in 19 patients (14 females, 5 males; mean age, 56.6 years) between May 2011 and June 2014, and the patients were treated using flow diverter stents. A total of 28 flow diverter stents, including 9 Silk and 19 Pipeline stents were used. Occlusion rates evaluated with computed tomography at the end of month 6 and digital subtraction angiography after one year, intraoperative success, morbidity and mortality rates were determined. Results: A total of 20 endovascular interventions, including two interventions in two different aneurysms in one patient were performed in 19 patients. Flow diverter stents were successfully implemented for wide-necked aneurysms at a success rate of 100%. Coil treatment had previously been performed in four patients. Aneurysm occlusion rates were 77.2% at month 6 and 90.9% at the end of month 12. Conclusion: The use of flow diverter stents is a reliable and effective method in the treatment of wide-necked intracranial aneurysms with high aneurysm occlusion, and low morbidity and mortality rates.
Interobserver and Intermethod Variability in Data Interpretation of Breast Strain Elastography in Suspicious Breast Lesions
(2021) Turnaoglu, Hale; Haberal, Kemal Murat; Arslan, Serdar; Yavuz Colak, Meric; Ulu Ozturk, Funda; Uslu, Nihal; https://orcid.org/0000-0002-0781-0036; https://orcid.org/0000-0002-8211-4065; https://orcid.org/0000-0001-7984-4326; https://orcid.org/0000-0002-0294-6874; https://orcid.org/0000-0003-2782-2824; 32950046; AAK-8242-2021; R-9398-2019; AAA-4360-2021; JCP-5266-2023
Background/aim: Strain elastography has the disadvantage of being operator-dependent. Interobserver variability is observed during image acquisition and interpretation. This study aimed to analyze the interobserver and intermethod variability of strain elastography in image interpretation and evaluate the diagnostic performance combining elasticity score and strain ratio with ultrasonography. Materials and methods: A retrospective study was conducted on 70 breast lesions evaluated with B-mode ultrasonography and strain elastography. B-mode ultrasonography findings, elasticity scores, and strain ratio values were evaluated using static images by two radiologists. BI-RADS assessment of the lesions and the decision of both observers as to whether the biopsy was required using B-mode ultrasonography, and the combined ultrasonography+elasticity score, and the combined ultrasonography+elasticity score+strain ratio were compared with the histopathological results. Also, the interobserver agreement was analyzed for all the combinations. Results: There was very good agreement (weighted kappa = 0.865) between the observers for the elasticity scores. Very good agreement was observed between the observers for BI-RADS assessments using the combined ultrasonography+elasticity score and the combined ultrasonography+elasticity score+strain ratio (weighted kappa = 0.848, and 0.902, respectively). Area under the curve of B-mode ultrasonography, the combined B-mode ultrasonography+elasticity score, and the combined B-mode ultrasonography+elasticity score+strain ratio, were calculated as 0.859, 0.866, and 0.916 for observer 1, and 0.851, 0.829, and 0.916 for observer 2, respectively. There were no statistically significant differences between the observers' diagnostic performances in any of the combinations (P = 0.703, 0.067, and 0.972, respectively). Conclusion: In the evaluation and further assessment of breast lesions, semiquantitative strain ratio calculation may help improve diagnostic accuracy by reducing interpretational variety, when used together with B-mode ultrasonography and elasticity scoring, especially for inexperienced individuals.
Malign ve benign meme lezyonlarının ayırımında sonoelastografinin tanıya katkısı
(Başkent Üniversitesi Tıp Fakültesi, 2015) Arslan, Serdar; Uslu, Nihal
Meme kanserinde tarama ve tanıda altın standart olarak mamografi ve ultrasonografi tetkikleri kullanılmaktadır. Bununla birlikte meme lezyonlarında istenilen duyarlılık ve özgüllük verilerine henüz ulaşılamamıştır ve gereksiz girişimler sorun olmaya devam etmektedir. Bu çalışmada B-mod ultrasonografide tespit edilen meme lezyonların malign ve benign ayırımında ultrasonografik elastografinin etkinliğinin araştırılması amaçlanmıştır. Bu çalışmaya B-mod ultrasonografi ile memesinde lezyon saptanan 81 hasta dahil edildi. Elastografi yöntemi ile elde edilen renkli kodlanmış haritalar değerlendirildi. Kompresyondan önce ve sonra elde edilen sinyaller sonucunda oluşan renk skalası Tsukuba skorlamasına göre değerlendirilerek 5 skora ayrıldı. Tüm lezyonların strain ratio değerleri hesap edildi. Strain ratio değeri incelenen dokunun çevresindeki esneklik değerlerinin incelenen lezyonun esneklik değerlerine oranı olarak kabul edildi. Elastisite skorları ve strain ratio ölçümleri histopatoloji sonuçları ile karşılaştırıldı. Hastaların yaş ortalaması 51,3±13,1 yıl ve lezyonun ortalama boyutu 16,3±11,9 mm idi. 38 hastanın histopatolojik tanısı malign iken 43 tanesi benign özellikte idi. Benign ve malign meme hastalığı olanlar arasında strain ratio değerleri bakımından istatistiksel olarak anlamlı fark vardı (p<0.05). Strain ratio değeri ortalaması benign lezyonlarda 1,8±0,9, malign lezyonlarda ise 4,3±1,5 idi. Histopatolojisi benign olan 43 hastanın sadece 1 tanesinde elastografi skoru 5 olarak değerlendirildi. Histopatolojisi malign olan 38 hastadan 7 tanesinin elastografi skoru 4, 20 tanesinin elastografi skoru 5 olarak değerlendirildi. Duyarlılık, özgüllük ve eşik değerleri sırasıyla %78,9, %90,7 ve 2.84 olarak bulunmuştur. Strain ratio eşik değerine göre malign olduğu şüphelenilen hastaların %88,2’sinin histopatolojisi malign, benign şüphesi olan hastaların da %82,9’unun histopatolojisi benign idi. Sonuç olarak pratik bir şekilde uygulanabilen strain elastografinin şüpheli meme lezyonlarının benign ve malign ayırımında diğer yöntemleri tamamlayıcı bir teknik olduğunu ve bu lezyonlar için yapılması planlanan biyopsi ihtiyacını azaltabileceğini düşünmekteyiz. Mammography and ultrasonography is the gold standard examination for scanning and diagnosis of breast cancer. However, these examinations have not reached the ideal specificity and sensitivity values and so the redundant invasive procedures are still continued to be problematic. In this study we aimed to evaluate the effectiveness of ultrasonic elastography in differential diagnosis of malign and benign breast lesions. In this study we enrolled 81 patients (80 female, 1 male) breast lesions detected by B-mode ultrasonography. Colored coded maps obtained by elastography. Color scale of signals obtained before and after compressions was divided into 5 scores according to Tsukuba score. Strain ratio values defined as the elasticity ratio between the peripheral and inspected tissue were calculated in all lesions. Both elasticity scores and strain ratio measurements were compared with histopathology results. The mean age of the patients were 51.3±13.1 years and the mean size of the lesions were 16.3±11.9 mm. Of the lesions 38 were malign and 43 were benign. Strain ratio values were statistically significantly different between benign and malign lesions. The mean strain ratio values for benign and malign lesions were 1.8±0.9 and 4.3±1.5, respectively. Only one of 43 histopathologically benign patients had 5 elastrography score while seven had 4 and twenty had 5 elastrography score among 38 histopathologically malign patients). Sensitivity, specificity and cut-off values were 78.9% , 90.7% and 2.84, respectively. According to strain ratio cut-off level, 88.2% of malign suspected patients were confirmed as malign and 82.9% of benign suspected patients were confirmed as benign. In conclusion ultrasonic elastography seems to be a practical and alternative technique to distinguish the benign and malign breast lesions and decrease the number of unnecessary biopsies.
The role of shear wave elastography in the diagnosis of chronic autoimmune thyroiditis
(2015) Hekimoglu, Koray; Donmez, Fuldem Yildirim; Arslan, Serdar; Ozdemir, Adnan; Demir, Canan; Yazici, Canan; 26343080
Aims: The aim of this study is to assess the applicability of shear wave elastography (SWE) in the diagnosis of chronic autoimmun thyroiditis (CAT) patients. Material and methods: The study group consisted of 50 patients with first-diagnosed CAT and 40 control subjects (CS). In all patients with CAT and CS, sonoelastographic measurements were made in both thyroid lobes. Optimal cut-off values were chosen to maximize the sum of sensitivity and specificity. Positive predictive value (PPV), negative predictive value (NPV), and accuracy values were also calculated. Results: Quantitative elastographic analysis evaluated by SWE in CAT patients (2.56 +/- 0.30 m/s) was significantly higher compared with CS (1.63 +/- 0.12 m/s) (p<0.001). The optimal cut-off value was 2.42 m/s. SWE had 77% sensitivity, 71% specificity, 92% PPV, 81% NPV, and 87% accuracy for the presence of CAT. Conclusions: Our data indicate that SWE correctly defines the elasticty of thyroid parenchyma, and this technique may assist in the diagnosis and treatment monitoring of CAT.
Value of diffusion-weighted imaging in hypoglycemic encephalopathy
(2015) Donmez, Fuldem Y.; Arslan, Serdar; Agildere, Ahmed M.; Ecevit, Ayse; 26166602