Browsing by Author "Yilmaz Ovali G."

Now showing 1 - 13 of 13
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    Pituitary abscess simulating macroadenoma
    (2004) Yilmaz Ovali G.; Tarhan S.; Şentürk H.; Bayindir P.; Pabuşçu Y.
    [No abstract available]
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    Hemangioma of the rib
    (2006) Yilmaz Ovali G.; Göktan C.; Tarhan S.; Örgüç Ş.; Ayhan S.; Saribülbül O.; Zeybek R.
    [No abstract available]
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    Incidental extrabiliary system lesions detected by an open magnetic resonance imaging system during magnetic resonance cholangiopancreaticography examinations
    (Turkiye Klinikleri, 2006) Örgüc Ş.; Pekindil G.; Yilmaz Ovali G.; Serter S.; Ünlü M.
    Objective: The purpose of this article is to determine the spectrum and the incidence of incidental extrabiliary lesions detected during magnetic resonance cholangiopancreaticography (MRCP) performed with an open magnetic resonance imaging (MRI) system. Material and Methods: Incidental lesions were retrospectively evaluated in 242 patients who were referred to our department for MRCP examination with suspected pathologies of gallbladder and bile ducts. Results: A total of 124 incidental lesions in 89 patients were detected. The incidence of incidental extrabiliary system lesions was 36.8% (89/242). Seventeen hepatic cysts, 5 hepatic hemangiomas, 3 hepatic metastasis, 4 chirrotic livers, 1 subcapsular hematoma of the liver, 3 hepatomegalies, 3 splenomegalies, 8 vertebral hemangiomas, 3 vertebral metastases, 1 discitis, 1 pseudomeningocele, 27 renal cysts, 2 renal atrophies, 2 hydronephrosis, 1 horseshoe kidney, 13 intraabdominal free fluid, 2 pleural effusions, 9 acute and 1 chronic pancreatitis, 2 pancreatic pseudocysts, 1 carcinoma of pancreatic corpus, 2 surrenal adenomas, 6 intraabdominal lymphaderomegalies (LAMs) 2 gastric carcinomas, 4 hydatic cysts (3 hepatic, 1 at the lung base) were determined. Conclusion: Many incidental pathologies of the adjacent organs are detected during MRCP examinations of the gallbladder and bile ducts. Lesion detection and characterization is improved when MIP images are evaluated together with TSE axial slices and source images. Since clinically significant extrabiliary lesion detection may improve the management of several cases, the radiologist must also focus on the incidental findings during the interpretation of MRCP examinations. Copyright © 2006 by Türkiye Klinikleri.
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    Radiologic features of lumbar spine in ochronosis in late stages
    (2006) Bayindir P.; Yilmaz Ovali G.; Pabuşçu Y.; Temiz C.; Duruoz T.
    Ochronosis is a rare hereditary disorder of tyrosine metabolism. Severe degenerative arthritis and spondylosis occur in the later stages of this disease. Radiologic examinations may reveal changes considered almost pathognomonic for ochronosis. We present the radiologic features of the lumbar spine in two ochronotic patients who were diagnosed after radiologic examinations in the late stages of the disease. © Clinical Rheumatology 2005.
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    Unusual long bone and metacarpo-carpal abnormalities in a case of pseudo-pseudohypoparathyroidism
    (2007) Unlu Z.; Orguc S.; Yilmaz Ovali G.; Bayindir P.
    A case of pseudo-pseudohypoparathyroidism (PPH) with shortening of the left femur and tibia and coalition of the base of the fourth metacarpals with capitatum and hamatum in bilateral wrist joints was presented. Involvement of the fourth digits both in hands and feet were more prominent on the left side, with shortening of the left leg. © Clinical Rheumatology 2006.
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    Identification of unknown bodies by using CT images of frontal sinus
    (Elsevier Ireland Ltd, 2007) Tatlisumak E.; Yilmaz Ovali G.; Aslan A.; Asirdizer M.; Zeyfeoglu Y.; Tarhan S.
    The aim of the study was to define a simple system for the identification of unknown bodies by using CT images of frontal sinus and to discuss whether it was worth to add measurements to the system or not. The system was including simple features as F (presence or absence of frontal sinus), S (intersinus and intrasinus septum) and S (scalloping), and named as FSS system. Measurements selected for the study were width, height, anteroposterior length, total width of two sinuses, the distance between the highest points of the two sinuses and the distance of each sinus to its maximum lateral limit. The study was conducted retrospectively on the paranasal CT scans of 100 cases (38 male and 62 female) who had no apparent sinonasal pathology. All the features and measurements were coded according to the system defined by the authors for each case and coded formulas were compared. At least 93% of the formulas could be eliminated for a case by using FSS system. The rate of success was increased to 98% by adding measurements. Contrary to objective criteria of FSS system, measurements were prone to bias. Therefore, in practice success rate would be expected to be lower than calculated. In the study population, instead of making 100 measurements, eliminating the most of the cases with FSS system and later discriminating the rest by pattern matching was seen logical. © 2006 Elsevier Ireland Ltd. All rights reserved.
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    Doppler ultrasonography imaging of hemodynamic alteration of retrobulbar circulation in type 1 diabetic children and adolescents without retinopathy
    (2008) Yilmaz Ovali G.; Ersoy B.; Tuncyurek O.; Urk V.; Ozkol M.; Ozhan B.; Baser E.; Pabuscu Y.
    Aim: We aimed to investigate the retrobulbar blood circulation using Colour Doppler Imaging (CDI) in type 1 diabetic children and adolescents who had no diabetic retinopathy and to compare the results with their healthy peers. Methods: Forty-nine patients with type 1 diabetes mellitus with no retinopathy on fundoscopic examination were included in the study. Forty-nine healthy children were defined as the control group. Central retinal artery (CRA), ophthalmic artery (OA) and posterior ciliary artery (PCA) were examined with Doppler US bilaterally. Peak systolic velocity (PSV), end diastolic velocity (EDV) and resistive indices (RI) for each artery were recorded. Results: Blood flow velocity of the OA was significantly different in diabetic patients (p < 0.05). EDV of the OA was significantly higher (p = 0.011) and RI was significantly lower (p = 0.027) in patients with diabetes duration of longer than 5 years. RI of the CRA was significantly higher in patients who had higher microalbuminuria levels (p = 0.016). Conclusion: EDV of the OA increases and RI of the OA decreases in diabetes duration longer 5 years. Raised AER increases RI of the CRA. These findings may be the initial changes in the arterial circulation before vascular rigidity develops. © 2007 Elsevier Ireland Ltd. All rights reserved.
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    Co-occurrence of internal carotid artery agenesis with multicystic dysplastic kidney
    (2009) Yilmaz Ovali G.; Tarhan S.; Bayindir P.; Polat M.; Akil I.
    Congenital absence of Internal Carotid Artery (ICA) is a rare disorder. This anomaly may be an isolated entity or may be associated with other organ, or system anomalies (1). Multicystic Dysplastic Kidney (MCDK) is a congenital mal-development in which the renal cortex is replaced by numerous cysts of multiple sizes. Urologic and non-urologic anomalies may accompany MCDK (2). In this paper, we detail a case of congenital agenesis of ICA and the existence of MCDK. To our knowledge, this is the first of such a case to be reported regarding the co-occurrence of ICA agenesis and MCDK. © TÜBİTAK.
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    The comparison of MRI findings with severity score of incontinence after pubovaginal sling surgery; [Pubovajinal sling operasyonu sonrası inkontinans şiddet indeksi ile MRG bulgularının karşılaştırılması]
    (Turkiye Klinikleri Journal of Medical Sciences, 2010) Tarhan S.; Gümüş B.; Temeltaş G.; Yilmaz Ovali G.; Serter S.; Göktan C.
    Aim: To investigate the relationship between postoperative MRI findings and the severity score of incontinence in patients treated with pubovaginal sling surgery. & Materials and methods: Fifty-two female patients treated with pubovaginal slings were included in the study. These patients' severity scores of incontinence were evaluated in the postoperative 6th month. All the patients were examined using MRI on the same day. A T2-weighted sagittal image of the midline structures, including the symphysis, urethra, and coccyx, was obtained at rest and at maximal strain. The mobility of the bladder floor and change in the posterior urethrovesical angle were calculated for each patient. Relationships between the severity score of incontinence and mobility of the bladder floor and change in the posterior urethrovesical angle were analyzed using Spearman's rank correlation coefficients by means of SPSS.& Results: A positive correlation was found between the severity score of incontinence and the mobility of the bladder neck and also between the score and the degree of posterior urethrovesical angle (r = 0.797, P = 0.000; r = 0.62, P = 0.000, respectively). There was also a positive correlation between the severity score of incontinence and the increase in posterior urethrovesical angle during Valsalva's maneuver (r = 0.47, P = 0.02). & Conclusion: MRI is a non-invasive diagnostic method for the evaluation of bladder floor position, mobility of the bladder neck, and posterior urethrovesical angle in patients with stress urinary incontinence. It can play a major role in the postoperative follow up of stress urinary incontinence. MRI can also be used for the assessment of success in pubovaginal sling surgery. © TÜBİTAK.
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    Benign versus malignant vertebral compression, chemical shift MR imaging, is it useful?
    (Kowsar Medical Institute, 2017) Yilmaz Ovali G.; Düzgün F.; Farasat M.; Orguc S.
    Objectives: The aim of this study was to evaluate the diagnostic accuracy of chemical shift imaging in vertebral compression. Patients and Methods: Forty-nine patients with vertebral compression with suspected malignancy or history of trauma were included in this study. MR imaging of the spine with standard conventional MR sequences and additional chemical shift imaging was done with 1.5 Tesla MR Unit. Regions of interest (ROI) were placed on the abnormal marrow of compressed vertebrae both on the opposed phase and on the matching in phase images and signal intensity (SI) ratio values (SI out-phase/SI-in phase) were calculated. Results: Forty-nine patients had 68 spine lesions, consisting of 49 benign and 19 malignant fractures. Student t test, receiver operating characteristic (ROC) analysis and interclass correlation test were used statistically. Mean SI ratio of benign vertebral compression (0. 68 ± 0.29, range 0.13 - 1.53) was significantly lower than malignant SI ratio values (1.06 ± 0.10, range 0.96 - 1.35). With student t-test, there was significant difference between benign compressions compared to malignant compressions (P < 0.001). Receiver operating characteristic (ROC) curve analysis was used to determine the optimal cut off value in malignant and benign lesion definition. The optimal SI ratio cut off value was found to be 0.96 for separating benign and malignant vertebral compression. The area under the curve (AUC) value was observed as 0.92 (95% confidence interval [CI] = 0.86 - 0.99). According to that cutoff value, sensitivity was 100% (95% CI = 82.35% - 100%) and the specificity was 86% (95% CI = 72.76% - 94.06%). Interobserver reliability was studied with intraclass correlation and results were statistically significant with intraclass correlation coefficient (ICC) as 0.85 (P < 0.05). Conclusions: There is significant difference in signal values between benign and malignant compression fractures in chemical shift MR imaging. Chemical shift MR imaging has much additive data to conventional MRI in vertebral compression. © 2016, Tehran University of Medical Sciences and Iranian Society of Radiology.
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    Sonoelastographic features of major salivary gland tumors and pathology correlation
    (Kowsar Medical Institute, 2018) Farasat M.; Yilmaz Ovali G.; Duzgun F.; Eskiizmir G.; Tarhan S.; Tan A.
    Objectives: To investigate the diagnostic efficiency of elastography in differentiation of malignant and benign tumors by evaluating salivary gland masses in means of their elastography scores and strain ratios. Patients and Methods: Twenty five patients with salivary gland mass lesions were detected through B- mode ultrasonography, Doppler ultrasonography, strain elastography and their strain ratios were calculated. The results were compared with histopathologic results. Results: Twenty five patients had 27 lesions consisting of seven malignant and 20 benign lesions. Mann Whitney U test, ROC analysis, Fisher test and Chi square tests were used statistically. Mean strain rates were calculated as 2.26 ± 0.29 in the benign group and 2.02 ± 0.59 in the malignant group. There was no statistically significant difference between the two groups (P = 0.698). Elastography score was calculated as mean 2.4 ± 0.94 in the benign group and mean 2.28 ± 0.38 in the malignant group. There was no statistically significant difference between the two groups (P = 0.708). Accepting the strain rate as 0.89; sensitivity of elastography in differentiating malignant from benign lesions is 71%, and the specificity is 50%. However, the area under the ROC curve is 0.55, which is not statistically significant (P = 0.699). Conclusion: In conclusion, elastography is a supporting method for B-mode ultrasonography in the differentiation of benign and malignant salivary gland masses. However, the overlap of elastographic findings is evident in benign and malignant masses. Care should be taken to have tissues with similar stiffness under the reference tissue and the lesions in elastographic evaluation of the superficial mass. We have not met a study that has pointed out the importance of stiffness of the tissue located beneath the lesion that may affect the elastography results in the literature. In this respect our study is unique. © 2017, Iranian Journal of Radiology.
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    Pitfalls of diagnosing pituitary hypoplasia in the patients with short stature
    (Springer, 2024) Kiremitci Yilmaz S.; Yilmaz Ovali G.; Ozalp Kizilay D.; Tarhan S.; Ersoy B.
    Purpose: Height age (HA) and bone age (BA) delay is well known in the patients with short stature. Therefore assessing pituitary hypoplasia based on chronological age (CA) might cause overdiagnosis of pituitary hypoplasia. We aimed to investigate the diagnostic and prognostic value of the PH and PV based on CA, HA, or BA in the patients with GHD. Methods: Fifty-seven patients with severe and 40 patients with partial GHD and 39 patients with ISS assigned to the study. For defining the most accurate diagnosis of pituitary hypoplasia, PH and PV were evaluated based on CA, BA and HA. The relationship of each method with clinical features was examined. Results: The mean PV was significantly larger in patients with ISS compared to the GH-deficient patients. PV was more correlated with clinical features including height SDS, stimulated GH concentration, IGF-1 and IGFBP-3 SDS, height velocity before and after rGH therapy. We found BA-based PV could discriminate GHD from ISS (Sensitivity: 17%, specificity: 98%, positive predictive value: 94%, negative predictive value: 39%), compared to the other methods based on PH or PV respect to CA and HA. 3% of patients with ISS, 17% of patients with GHD had pituitary hypoplasia based on PV-BA. Conclusion: PV based on BA, has the most accurate diagnostic value for defining pituitary hypoplasia. But it should be kept in mind that there might be still misdiagnosed patients by this method. PV is also a significant predictor for the rGH response. © The Author(s) 2024.
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    Anaplastic Ependymoma and Atypical Refractory Longitudinal Expansive Transverse Myelitis Due to Immune Reaction After COVID-19-A Case Discussion That Raises Many Unknown Questions About Covid-19; [ COVID-19 Sonrası İmmün Reaksiyona Bağlı Atipik Refrakter Longitudinal Ekspansif Transvers Miyelit ve Anaplastik Ependimom - COVID-19 Hakkında Birçok Bilinmeyen Soruyu Gündeme Getiren Bir Vaka Tartışması]
    (Turkish Neuropsychiatric Society, 2024) İnalkaç Gemici Y.; Çelik F.; Göz Z.Z.; İşisağ A.; Yilmaz Ovali G.; Zileli M.; Barutçuoğlu M.; Mavioğlu H.
    Inflammatory neurologic manifestations, both infectious and non-infectious, have been reported secondary to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2/COVID-19). However, the relationship of spinal tumor and COVID-19 longitudinally extensive transverse myelitis (LETM) coexistence has never been reported in our knowledge. The clinical presentation and response to treatment of a 24-year-old female patient diagnosed with COVID-19 LETM and anaplastic ependymoma are described in this case report. The Patient’s cerebrospinal fluid COVID-19 antibody level was higher than serum and she was resistant to immunosuppressive treatment. The interaction between COVID-19 and spinal tumor was discussed in the light of the literature. It is thought that COVID-19 infection could trigger tumor growth in this patient. Also, this is the first case of anaplastic ependymoma and COVID-19 myelitis coexistence in the literature. © 2023 by Turkish Association of Neuropsychiatry.