Person: BUĞDAYCI, ONUR
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
BUĞDAYCI
First Name
ONUR
Name
11 results
Search Results
Now showing 1 - 10 of 11
Publication Metadata only Venous thrombosis in a pseudohypoparathyroidism patient with a novel GNAS frameshift mutation and complete resolution of vascular calcifications with acetazolamide treatment(2023-01-01) TRUE, ÖMER; BUĞDAYCI, ONUR; GÜRAN, TÜLAY; BEREKET, ABDULLAH; Menevse T. S., Iwasaki Y., Abali Z. Y., Tosun B. G., Helvacioglu D., DOĞRU Ö., BUĞDAYCI O., Cyr S. M., GÜRAN T., BEREKET A., et al.Introduction: Pseudohypoparathyroidism type IA (PHP1A) is characterized by end-organ resistance to multiple hormones and Albright’s hereditary osteodystrophy (AHO). PHP1A is caused by inactivating mutations of the GNAS gene encoding the α-subunit of the stimulatory G protein (Gsα). In line with the underlying genetic defect, impaired inhibition of platelet aggregation has been demonstrated in some patients. However, no PHP1A case with thrombotic events has been described. Also, PHP1A cases typically have subcutaneous ossifications, but soft tissue calcifications are another common finding. Treatment options for those and other nonhormonal features of PHP1A are limited. Case Presentation: A female patient presented with short stature, fatigue, and exercise-induced carpopedal spasms at age 117/12 years. Diagnosis of PHP1A was made based on hypocalcemia, hyperphosphatemia, elevated serum parathyroid hormone, and AHO features, including short stature and brachydactyly. A novel frameshift variant was detected in the last exon of GNAS (c.1065_1068delGCGT, p.R356Tfs*47), showing complete loss of baseline and receptor-stimulated activity in transfected cells. The patient developed venous thrombosis and vascular and subcutaneous calcifications on both forearms after venous puncture on the right and extravasation of calcium gluconate during treatment on the left. The thrombosis and calcifications completely resolved following treatment with low-molecular-weight heparin and acetazolamide for 5 and 8 months, respectively. Conclusions: This case represents the first PHP1A patient displaying thrombosis and the first successful use of acetazolamide for PHP1A-associated soft tissue calcifications, thus providing new insights into the treatment of non-endocrinological features in this disease.Publication Metadata only Oyun Değiştiren Güç: Yapay Zekâ.(Beta Basım Yayım Dağıtım, 2020-06-01) AKYURT, NURAN; OKTAR, FAİK NÜZHET; ACAR BÜYÜKPEHLİVAN, GÜLHAN; BUĞDAYCI, ONUR; Akyurt N., Oktar F. N. , Acar Büyükpehlivan G., Buğdaycı O.Publication Metadata only Breast ultrasonography: How useful in the diagnosis of precocious puberty?(2022-09-01) BIYIKLI, ERHAN; BUĞDAYCI, ONUR; DEMİRCİOĞLU, SERAP; GÜRAN, TÜLAY; BEREKET, ABDULLAH; Helvacioglu D., BIYIKLI E., BUĞDAYCI O., DEMİRCİOĞLU S., GÜRAN T., BEREKET A.Publication Open Access Effect of denosumab treatment on bone mineral density and bone turnover markers in osteoporotic patients: real-life experience 2-year follow-up(2022-12-01) DİNÇER YAZAN, CEYDA; BUĞDAYCI, ONUR; ILGIN, CAN; YAVUZ, DİLEK; DİNÇER YAZAN C., BUĞDAYCI O., ILGIN C., YAVUZ D.Summary Denosumab leads to improvements in BMD levels and is a well-tolerated agent according to results of randomized controlled studies but results in real-life setting are important to evaluate drug adherence and real-life efciency. In this study, we present the results of 305 patients that were treated with denosumab in our clinic. Introduction The long-term efcacy of anti-osteoclastic drugs in treatment of osteoporosis is well known. Denosumab, a novel human monoclonal antibody, is an anti-osteoclastic agent that has been shown to lead to reductions in vertebral, nonvertebral, and hip fracture risk in randomized and observational studies. Real-life data of this agent is increasing. In this study, we presented our real-life data about the 2-year follow-up of patients under denosumab treatment. Methods Osteoporotic patients who were treated with at least one denosumab injection between 2014 and 2020 years were included. Clinical and demographic data, bone turnover markers, and radiological reports (bone mineral densitometry (BMD), vertebral x-ray) were obtained from patient fles retrospectively. Results A total of 305 patients (f/m: 275/30, 68.1±11.05 years) were included. The median injection number was 4 (1–10). Two hundred seventy-three patients (89.8%) were persistent on treatment at the 12th month; 175 patients (57.3%) were persistent at 24th month. Sixty-eight patients (22%) were not using denosumab anymore, 55 of the patients were not continuing by doctor desicion and 13 were not continuing due to patient-related causes. Median BMD levels signifcantly increased from 0.809 (0.2–1.601, IQR: 0.136) to 0.861 (0.517–1.607, IQR: 0.14) in L1–L4 and from 0.702 (0.349–0.997, IQR: 0.125) to 0.745 (0.508–1.008, IQR: 0.137) in femur area at the 24th month of treatment. An improvement of 8.04% in L1–L4 BMD and 4.5% in femur neck BMD levels at the 24th month of treatment was observed. There was a signifcant decrease in bone turnover markers at the 24th month of treatment. Conclusion In our group of patients under denosumab treatment, 53% of persistence was found at 24 months and associated with improvement in BMD levels without any signifcant side efects except one case with urticarial reaction. Denosumab leads to improvements in BMD levels and is a well-tolerated agent in a real-life setting comparable to results of randomized controlled studies in patients with diferent comorbidities.Publication Metadata only Pediatrik optik gliom olgularının görme keskinlikleri ile elektofizyolojik ve radyolojik bulgularının değerlendirilmesi(2022-04-23) DERİCİOĞLU, VOLKAN; EKER, NURŞAH; BUĞDAYCI, ONUR; YARGI, BERRU; KURŞUN, MELTEM; SEVİK, MEHMET ORKUN; TOKUÇ, AYŞE GÜLNUR; ŞAHİN, ÖZLEM; Dericioğlu V., Eker N., Buğdayci O., Yargi B., Kurşun M., Sevik M. O. , Tokuç A. G. , Şahin Ö.Amaç:Optik gliom nedeniyle takip edilen pediatrik hastaların en iyi düzeltilmiş görme keskinliği (EİDGK, logMAR), flaş görsel uyarılmış potansiyeller (fVEP) ve manyetik rezonans görüntüleme (MRG) sonuçlarının karşılaştırılması.Yöntem:Marmara Üniversitesi Göz Hastalıkları, Pediatrik Onkoloji ve Radyoloji bölümlerince takip edilen 22 pediatrik optik gliom hastasının 38 gözü çalışmaya dahil edildi. Hastaların başlangıç ve son takipteki EİDGK’leri, MRG’deki optik sinir kalınlıkları (OSK), kontrast tutulumları, sinyal değişimleri ve fVEP’te P2 dalgasının amplitüd ve latansları değerlendirildi.Bulgular:Hastaların yaş ortalamaları 12±5.7 yıl ve kız/erkek oranı 13/9 idi. Ortalama takip süresi 63.95±24.5 ay olarak bulundu. Gözlerin ilk ve son EİDGK’leri sırasıyla, ortanca (1.ve 3. çeyrekler aralığı) 0.2 (0-2.18) ve 0.2 (0-2.3) logMAR (p=0.586); MRG’de ölçülen ortalama OSK’leri sırasıyla, 6.51±6.03 ve 6.31±7.84 mm (p=0.650); fVEP P2 dalga ortalama amplitüdleri sırasıyla, 16.68±14.21 ve 17.93±11.96 mV (p=0.577) ve ortalama latansları sırasıyla, 149.38±50.30 ve 133.39±29.78 ms (p=0.009) olarak saptandı. Son logMAR EİDGK ile OSK (r=0.434, p=0.015), P2 amplitüdü (r=-0.432, p=0.014)) ve P2 latansı (r=0.614, p<0.001) arasında anlamlı orta düzeyde korelasyon olduğu görüldü. fVEP P2 dalga parametreleri ile OSK arasında korelasyon saptanmadı (p>0.05). P2 latansı ile MRG’de görülen sinyal (r=0.426, p=0.013) ve kontrast tutulumu (r=0.386, p=0.027) değişiklikleri arasında anlamlı korelasyon olduğu görüldü.Sonuç:Optik gliom hastalarında fVEP P2 dalga amplitüdleri ve latansları EİDGK ile ilişkili gözükmektedir. Ayrıca, P2 dalga latansının MRG’de görülen sinyal ve kontast tutulumu değişiklikleri ile de ilişkili olduğu görülmektedir. Bu bulgular, özellikle preverbal yaştaki optik gliom hastalarının değerlendirilmesinde ve hastalık ilerlemesinin takibinde fVEP’in kulanılabileceğini göstermektedir.Publication Open Access Morphometric analysis of middle and posterior cranial fossae foramina in 3d reconstructions of ct images: A midline asymmetry evaluation(2022-01-01) VERİMLİ, URAL; BUĞDAYCI, ONUR; BEKİROĞLU, GÜLNAZ NURAL; VERİMLİ U., BUĞDAYCI O., Yildiz S. D., Ozkilic E., BEKİROĞLU G. N., ÖZDOĞMUŞ N. Ö.Objective: The cranial base harbours numerous foramina, and the anatomical properties of the foramina are crucial in clinical interventions. The purpose of the current study is to evaluate possible asymmetries regarding the middle and posterior cranial fossae foramina using 3D reconstructions of high-resolution computed tomography (CT) images. Patients and Methods: High-resolution cranial CT images of 253 female and 287 male adult patients were used in the study. The patients were 18 to 40 years of age without any apparent cranial pathology. The distances from the foramen rotundum, foramen ovale, foramen spinosum, internal acoustic meatus, hypoglossal canal to the midline were measured bilaterally to compare both sides. Results: The foramen spinosum and the mid-clival line measurements demonstrated statistically significant results favoring the right side (p=0.03, right mean 3.052 ± 0.253 cm, left mean 2.982 ± 0.193 cm). In males, the right foramen spinosum to mid-clival line measurements were significantly longer than the left side (p=0.027, right mean 3.150 ± 0.250 cm, left mean 3.070 ± 0.180 cm). Conclusion: As predicted, the male measurements were significantly longer than the female measurements regardless of sides in all measurements. The measurements of cranial asymmetries may help describe anomalies and may contribute to the clinical approachesPublication Open Access Prediction of nipple involvement in breast cancer after neoadjuvant chemotherapy: Should we rely on breast MRI to preserve the nipple(2023-01-01) UĞURLU, MUSTAFA ÜMİT; BUĞDAYCI, ONUR; AKMERCAN, AHMET; KAYA, HANDAN; AKOĞLU, HALDUN; GÜLLÜOĞLU, MAHMUT BAHADIR; UĞURLU M. Ü., BUĞDAYCI O., AKMERCAN A., KAYA H., AKIN TELLİ T., AKOĞLU H., GÜLLÜOĞLU M. B.Background: Indications for nipple sparing mastectomy (NSM) is extending to post-neoadjuvant chemotherapy (NAC) setting. Eligibility for NSM with an optimum tumor-nipple distance (TND) after NAC is unclear. We examined predictive factors for nipple tumor involvement in patients undergoing total mastectomy following NAC. Methods: Clinical and pathological data from prospectively collected medical records of women with invasive breast carcinoma, who were undergone NAC and total mastectomy with sentinel lymph node biopsy and/or axillary lymph node dissection were analyzed. PreNAC and postNAC magnetic resonance imaging (MRI) views were examined and a cut-off TND value for predicting the negative nipple tumor status was determined. Results: Among 180 women, the final mastectomy specimen analysis revealed that 12 (7%) had nipple involvement as invasive carcinoma. Patients with nipple involvement had more postNAC multifocal/multicentric tumors (p: 0.03), larger tumors on preNAC and postNAC images (p: 0.002 and p 2mm) on preNAC and postNAC images (p < 0.001 and p: 0.01). The best likelihood ratios (LR) belonged to the postNAC positivity of the < 20 mm TND, with a + LR of 3.40, and − LR of 0.11 for nipple involvement. PreNAC positivity of the < 20 mm TND also had a similar − LR of 0.14. Conclusion: A TND-cut-off ≥ 2 cm on preNAC and postNAC MRI was shown to be highly predictive of negative nipple tumor involvement.Publication Open Access Adenoid cystic carcinoma of the breast: multimodality imaging findings and review of the literature(2022-01-01) BUĞDAYCI, ONUR; Guldogan N., ICTEN S. G. , KAYADİBİ Y., TAŞKIN F., Alfatli A. O. , Boy F. N. S. , BALCI P., BUĞDAYCI O., TOKAT F., ÖZTÜRK T., et al.© 2022 The Association of University RadiologistsRationale and Objectives: Adenoid cystic carcinoma (ACC) of the breast is a rare type of breast cancer with favorable prognosis. There is limited data on the radiological findings of this rare tumor in literature. The aim of this study is to determine the most common imaging features and review the literature. Materials and Methods: Pathological databases of seven institutions from 2009 to 2021 were retrospectively reviewed, and patients with a diagnosis of ACC of the breast were determined. Thirteen patients whose imaging studies could be recalled from the picture archiving systems (PACS) were included in the study. Clinical and pathological findings as well as follow-up data were recorded. Radiological findings were analyzed and categorized based on BI-RADS 5th edition. Results: There were 16 mass lesions in 13 patients (two multifocal cases, one case with recurrence). Mammography demonstrated 14 masses, while ultrasound (US) demonstrated all. MRI was available in only seven cases, with eight masses. The most common findings were round or oval shape on all modalities (78.57%–93.75%). Other frequent findings were parallel orientation (81.25%), isoechoic or hyperechoic echogenicity (62.5%), high T2 signal (87.5%), restricted diffusion (71.43%), and homogeneous enhancement (62.5%). Mammography, US and MRI showed circumscribed margins resembling a benign lesion in 35.71%, 37.5% and 50% of the lesions respectively. Three patients had a cyst-like echogenicty on US. Half of the lesions were avascular on Doppler US (6/12) and half were soft (2/4) on strain elastography. Although there were benign features on all imaging modalities seperately, all lesions could be categorized as BI-RADS 4 or 5 when the findings were combined. However 9/16 masses were BI-RADS 4A, emphasizing the subtlety of the malignant features. Conclusion: ACC of the breast can present with findings resembling a benign lesion on different imaging modalities. Although combination of all imaging findings correctly indicated the suspicious nature of the lesions in all cases, final classification was BI-RADS 4A in most of them. Radiologists should be aware of the more frequent findings of ACC of the breast for early diagnosis. US findings of isoechoic or hyperechoic appearance, and cyst-like echogenicity have not been reported previously in literature.Publication Open Access Impact of skeletal muscle measurements by chest computed tomography on survival and postoperative complications in patients with soft tissue sarcoma(2022-01-01) ARIKAN, RUKİYE; EROL, BÜLENT; KÖSTEK, OSMAN; BAYOĞLU, İBRAHİM VEDAT; DANE, FAYSAL; YUMUK, PERRAN FULDEN; ÖZGEN, ZERRİN; BUĞDAYCI, ONUR; AKIN TELLİ T., BUĞDAYCI O., Alan O., Sariyar N., Isik S., Arikan R., Yasar A., Majidova N., Celebi A., EROL B., et al.© 2022 Taylor & Francis Group, LLC.This study aims to evaluate whether sarcopenia, measured by chest computed tomography (CT), affects survival outcomes and postoperative complications in soft tissue sarcoma (STS) patients undergoing surgery. In this retrospective study, CT scans of 79 patients were reviewed to measure pectoralis and T12 vertebra muscle area. Both were then adjusted for height (cm2/m2) as pectoralis muscle index (PMI) and T12 vertebra muscle index (TMI). Analyses were performed by dichotomizing muscle indices at gender-specific 50th percentile; PMI and TMI < 50th percentile were defined as low, and ≥50th percentile as high. Overall postsurgical complication rate (PCR) was 16%. Median length of hospital stay (LOHS) was 10 days (3–90). PMI and TMI were significantly lower in women (p = 0.02, p = 0.04). Median body mass index was significantly higher in high PMI and TMI groups (p = 0.01 for both). PCR and LOHS were similar between low and high PMI and TMI groups. Median follow-up was 29 months, 37 patients had recurrence and 23 died. No significant difference was noted between low and high PMI and TMI groups, in terms of disease-free or overall survival. PMI and TMI as measured by chest CT had no impact on survival outcomes or postoperative complications in localized STS.Publication Metadata only Radyolojide tıbbi hizmet kaynaklı hata ve malpraktis(Akademisyen Yayınevi Kitabevi, 2022-11-01) BUĞDAYCI, ONUR; TURAN YURTSEVER, NURŞEN; Buğdaycı O., Turan Yurtsever N.