Yelda Ozsunar | Adnan Menderes University (original) (raw)

Papers by Yelda Ozsunar

European Journal of Radiology, Jun 1, 2005

Purpose: We report computed tomography (CT) findings in 13 patients with a primary abdominal desm... more Purpose: We report computed tomography (CT) findings in 13 patients with a primary abdominal desmoplastic small round cell tumor. Materials and methods: Thirteen cases (12 men, 1 woman, mean age = 24.8 years) were found in our hospital database between 1991 and 2003. Clinical, CT, and histopathological features were studied retrospectively. Results: Peritoneal involvement was the most common feature. In 10 cases, several lobulated peritoneal soft tissue masses (with a mean of four masses per patient) were seen. Two patients had diffused irregular peritoneal carcinomatosis without any distinct peritoneal masses. One patient had a solitary mass in the pelvic space. The main sites of peritoneal involvement were the pelvic space (n = 7), omentum (n = 5), retroperitoneal space (n = 4), small bowel mesentery (n = 3), paracolic gutter (n = 2 on the right and n = 1 on the left), transverse colon mesentery (n = 1), perisplenic space (n = 1), and perihepatic space (n = 1). The soft tissue masses were often bulky (mean = 6 cm, range = 1-28 cm), lobulated, and heterogeneous with hypodense areas (in 73% of cases). In six cases, moderate ascites was seen. In one case of pelvic involvement, unilateral hydronephrosis was seen. Adenopathies were present in seven cases at the time of the diagnosis (at intraperitoneal, retroperitoneal, and pelvic sites in six patients and in the groin in one patient). Five patients had liver metastases (four lesions per case excepted one patient with 30 metastases). Associated thoracic metastases were seen in three patients. The diagnosis was confirmed with four CT-guided percutaneous biopsies. Conclusion: Although CT features are nonspecific, the diagnosis of desmoplastic small round cell tumor may be suspected in young men with multiple bulky heterogeneous peritoneal soft tissue masses. Imaging is useful for staging and also to guide biopsies.

American Journal of Roentgenology, Dec 1, 2001

OBJECTIVE. Our aim was to determine the use of advanced technology and archiving and the contribu... more OBJECTIVE. Our aim was to determine the use of advanced technology and archiving and the contribution of countries other than United States in the articles published in the American Journal of Roentgenology (AJR) and Radiology. We analyzed the association of these features with the type of research, the main technical features of the modalities used, and the countries of origin. MATERIALS AND METHODS. We determined the proportion of articles published in 18 randomly selected issues of the AJR and Radiology that required advanced imaging techniques and relied on the analysis of archived data. "Advanced technology" was defined as imaging techniques that serve a purpose other than simple anatomic imaging or that are not widely available because of the high cost of the technology, such as functional imaging and computer programming designed for an individual study or simulation studies. We analyzed the association of these features with the country of origin, the topic, and the methodology used. RESULTS. Sixteen percent of the studies required advanced technology. MR imaging, CT, and sonography were the most frequently used modalities (31%, 27%, and 15% of studies, respectively). Archiving was used in 37% of the studies, and 67% of the original articles were prospective. The articles most commonly originated in North America (67%), Europe (20%), and Asia (12%). CONCLUSION. Only a small percentage of published research studies required advanced technology and approximately one third of the studies used archiving. These results may suggest that other criteria, such as the design of the study, its relevance for daily clinical use, and the originality of the paper, have a major impact on the acceptance of papers in clinically oriented radiology journals.

InTech eBooks, Dec 9, 2011

European Spine Journal, Sep 7, 2005

Journal of Clinical Ultrasound, Aug 8, 2003

Sonography and CT are effective tools in early diagnosis of asymptomatic inguinal hernia. Sonogra... more Sonography and CT are effective tools in early diagnosis of asymptomatic inguinal hernia. Sonography can be used not only for the diagnosis of hernia but also for its treatment. Real‐time sonographically guided hernia reduction may avoid tissue damage that can arise from misguided compression. We report a unique case in which an incarcerated omental hernia in a 50‐year‐old woman was diagnosed and subsequently reduced via compression with an ultrasound transducer. © 2003 Wiley Periodicals, Inc. J Clin Ultrasound 31:379–382, 2003

Surgical Neurology, Feb 1, 2008

Background: Involvement of the brain by Aspergillus fumigatus, named as invasive aspergillosis, i... more Background: Involvement of the brain by Aspergillus fumigatus, named as invasive aspergillosis, is extremely rare. Definitive diagnosis needs isolation of the fungus from the tissue specimens and its culture. The disease is very resistant to treatment and quickly becomes fatal despite antifungal chemotherapy with AmB preparations, the drugs of choice for the infection. Case Description: We hereby present a unique case of fungal granuloma of the brain due to A fumigatus, which was cured successfully by intensive antifungal treatment, along with a brief literature review. Conclusions: Although it is rare, we draw the attention to the fact that early diagnostic procedures with rapid confirmation of Aspergillus infection and an early initiation of therapy are pivotal for a benign clinical course in such cases. A complete regression of the disease could be achieved with medical therapy alone with conventional AmB or liposomal AmB combined with oral itraconazole even if a total surgical excision of the lesions could not be performed in complicated cases, as in our patient.

Meandros Medical and Dental Journal, Aug 1, 2002

Soliter osteokondromlarýn komplikasyonlarý; kemik boyun fraktürü, kitle etkisi ve sinir sýkýþmasý... more Soliter osteokondromlarýn komplikasyonlarý; kemik boyun fraktürü, kitle etkisi ve sinir sýkýþmasýdýr. Oldukça nadir görülen diðer komplikasyonlar malign transformasyon ve bursittir. Semptomatik hale gelen osteokondromlu hastalar malign transformasyon açýsýndan araþtýrýlmalýdýr. Sað krurisinde kitle ve aðrý þikayeti ile baþvuran bir hastada yapýlan MR incelemesi sonucunda fibular osteokondrom ve eþlik eden bursit saptandý. Olgumuzda nadir görülen osteokondrom bursitinin klinik ve MR bulgularýný tartýþtýk. Osteokondrom, bursit, MR

The insula which is deeply placed to the temporal lobe of the brain has many important functions,... more The insula which is deeply placed to the temporal lobe of the brain has many important functions, even though it accounts for only 2% of the brain's cortical surfaces. Much of the information we have about the functions of the insula is owed to the developments in magnetic resonance (MR) technology. We can clarify whether the insula is affected by pathological conditions with advanced magnetic resonance imaging (MRI) techniques such as diffusion-weighted MRI, susceptibility-weighted MRI, perfusion MRI, and MR spectroscopy. We can also get important information about the functions of the insula with functional MRI (fMRI), which allows functional evaluation. Another purpose in imaging is to determine the possible risks before operation and contribute to operation planning, by assigning areas of social and vital functions such as speech, motor, and cardiopulmonary functions.

Today, tuberculosis (TB) still constitutes a major problem in developing countries like Turkey. T... more Today, tuberculosis (TB) still constitutes a major problem in developing countries like Turkey. The spread of TB in the society is closely associated with increased prevalence of the immune system deficiencies such as acquired immune deficiency syndrome. The current chapter will focus on tuberculous meningitis and spinal TB. In both entities, the cranial and spinal involvement may occur concurrently. Owing to the fact that the clinical symptoms offer little help for the differential diagnosis, imaging plays a crucial role for this purpose. Intracranial and spinal tuberculomas which act as single space-occupying lesions that are accompanied by midline shifts and increased intracranial pressure and which fail to respond to chemotherapy should be removed surgically.

Adnan Menderes Üniversitesi Tıp Fakültesi dergisi, 2002

... Soliter osteokondrom yaygın olarak görülen ve öncelikle periferal iskeleti tutan, ancak kafa ... more ... Soliter osteokondrom yaygın olarak görülen ve öncelikle periferal iskeleti tutan, ancak kafa kemikleri dahil diğer kemikleri de etkileyebilen benign bir kemik tümörüdür. ... Skeletal Radiol 1999; 28: 540-3. 8. Peh WC, Shek TW, Davies AM, Wong JW, Chien EP. ...

Poster: "ECR 2015 / A-083 / B. Understanding radiation- and chemotherapy-induced changes aft... more Poster: "ECR 2015 / A-083 / B. Understanding radiation- and chemotherapy-induced changes after treatment of brain tumours " by: " Y. Ozsunar ; Aydin/TR"

Early Human Development, Nov 1, 2008

Clinical and Experimental Obstetrics & Gynecology, Apr 10, 2019

Sonoelastography is an assistant method of conventional ultrasound that measures the elasticity o... more Sonoelastography is an assistant method of conventional ultrasound that measures the elasticity of tissue. Strain elastography (SE) or real time sonoelastography gives the relative tissue hardness by calculating the rate of strain between target and reference tissue texture [1, 2]. SE is widely used in differentiating normal tissue from neoplasia, inflammation and fibrosis in breast, thyroid, prostate, and liver imaging [3, 4]. However, there is a limited number of article that use SE in the placenta. Preeclampsia (PE) is a serious clinical condition that can lead to placental dysfunction, fetal growth retardation, and fetal and maternal loss. PE can be diagnosed clinically with the presence of hypertension and proteinuria. Ultrasonography (US), Doppler ultrasonography (DUS), non-stress test (NST), and biophysics profile constitute the tests help to identify it. Umbilical and uterine artery DUS findings may be an early messenger of PE and intrauterine growth retardation (IUGR) [4, 5]. However, any test that was developed up to now does not have sufficient sensitivity for the diagnosis of PE. The aim of this study is to reveal whether there is any relationship between SE values and Doppler US findings, and to investigate the availability of SE in early diagnosis of PE. Materials and Methods This study was approved by the Ethics Committee of the University. Every patient included in the study was informed about the study and a voluntary consent form was obtained. Fifty-five cases of 21-24 weekly pregnant women joined the study. Only the pregnant women with anterior placements of placentas were included in this study. Gestational weeks (GW) were determined according to the last menstrual period. The cases of the largest vertical amniotic pocket calculated under 2 cm were evaluated as oligohydramnios and were not included in the study. There was no clinical findings of fetal distress in any cases. Cases were evaluated according to maternal age, gestational week, subcutaneous fat thickness, placental thickness, morphology, gravid, parity, and abortion data. All ultrasound examinations were performed with 6-MHz MF convex transducer. US elastography was performed by two radiologist with at least five years' experience. In all cases, B-mode US and US elastography were performed in the supine position. US elastography were performed in the supine position, with 6.1-MHz convex probe as sequential light-level compression and decompression perpendicular to the skin. Simultaneous sinusoidal waves are followed and data was imported. Palpation speed, amplitude, and persistence was important for the optimization. For this purpose, before starting the study, ten healthy pregnant women were exam ined for standardization of the elastog raphy technique. The two radiologist who applied SE were blinded to the US and Doppler imaging findings and patient histories. Placenta strain rate (target tissue strain/ reference tissue strain) were performed as semi-quantitatively. The authors selected the sub

PubMed, Jun 1, 2005

Transient hepatic attenuation difference (THAD) is a perfusion disorder that can sometimes be obs... more Transient hepatic attenuation difference (THAD) is a perfusion disorder that can sometimes be observed in hepatic arterial phase of a biphasic spiral CT examination. The involved site of liver by THAD appears as an area of high attenuation on the hepatic arterial phase image and returns to normal attenuation on portal venous phase image. The knowledge of the shape, distribution and causes of THAD is essential to differentiate the THAD from other pathologies such as neoplasm.

European Journal of Radiology, Nov 1, 2000

Imaging findings are presented of an unusual pathway of collateral circulation consisting of bila... more Imaging findings are presented of an unusual pathway of collateral circulation consisting of bilateral and diffuse dilated breast veins from a patient with long standing superior vena caval syndrome. The main importance of this case is the extent of the collateral development through the breast veins, serving as the major pathway of collateral circulation. Identification of this unusual collateral development, which resembles breast varices, was performed with contrast-enhanced chest CT scans, digital subtraction venography, color Doppler ultrasonography, and mammographic studies. Collateral development was secondary to a long segment idiopathic venous occlusion involving bilateral subclavian and brachiocephalic veins as well as vena cava superior. We conclude that dilated breast veins when detected on any imaging modality should raise the suspicion of central venous obstruction.

Acta Radiologica, 2000

Purpose: The aim of this study was to evaluate the impact of intraoperative ultrasonography (IOUS... more Purpose: The aim of this study was to evaluate the impact of intraoperative ultrasonography (IOUS) on surgical decision-making in patients with liver tumours. Material and Methods: IOUS of the liver was performed in 116 patients undergoing surgery for liver tumours. The patients were evaluated preoperatively by ultrasonography, CT and in some cases, by ERCP and scintigraphy. IOUS findings were compared with the results of preoperative imaging and surgical findings. Results: The surgical procedures were altered in 50 cases (43%), extended in 19 cases (16%) and reduced in 8 cases (7%). Twenty-three patients (20%) were found inoperable. Intraoperative evaluation caused surgical modification by IOUS in 13 patients (11%), by surgical findings in 14 patients (12%) and by a combination of both in 23 patients (20%). Conclusion: IOUS is a precise diagnostic method for staging the operability of liver tumours. Unnecessary surgical procedures can be avoided. In total, IOUS altered the preoperative plan in one-third of our patients and is therefore recommended as a routine procedure in connection with major liver surgery.

Neuroradiology, Oct 19, 1998

We report a unique case in which a needle was accidentally swallowed and migrated into the verteb... more We report a unique case in which a needle was accidentally swallowed and migrated into the vertebral body. Plain films and CT of the spine revealed fragmented, linear, metallic-density material in the L3 vertebral body. The possible mechanisms of the migration are discussed.

European Journal of Radiology, Sep 1, 2004

Objective: To investigate the effect of ADC heterogeneity on region of interest (ROI) measurement... more Objective: To investigate the effect of ADC heterogeneity on region of interest (ROI) measurement of isotropic and anisotropic water diffusion in acute (<12 h) cerebral infarctions. Methods and materials: Full diffusion tensor images were retrospectively analyzed in 32 patients with acute cerebral infarction. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values were measured in ischemic lesions and in the corresponding contralateral, normal appearing brain by using four ROIs for each patient. The 2 × 2 pixel square ROIs were placed in the center, the lateral rim and the medial rim of the infarction. In addition, the whole volume of the infarction was measured using a free hand method. Each ROI value obtained from the ischemic lesion was normalized using contralateral normal ROI values. Results: The localization of the ROIs in relation to the ischemic lesion significantly affected ADC measurement (P < 0.01, using Friedman test), but not FA measurement (P = 0.25). Significant differences were found between ADC values of the center of the infarction versus whole volume (P < 0.01), and medial rim versus whole volume of infarction (P < 0.001) with variation of relative ADC values up to 11%. The differences of absolute ADC for these groups were 22 and 23%, respectively. The lowest ADC was found in the center, followed by medial rim, lateral rim and whole volume of infarction. Conclusion: ADC quantification may provide variable results depending on ROI method. The ADC and FA values, obtained from the center of infarction tend to be lower compared to the periphery. The researchers who try to compare studies or work on ischemic quantification should be aware of these differences and effects.

Topics in Magnetic Resonance Imaging, Oct 1, 2000

Diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) are recently developed yet ... more Diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) are recently developed yet steadily evolving magnetic resonance techniques. DWI and PWI typically interrogate the microscopic diffusion and microcirculatory perfusion, and they can provide early, highly sensitive, and specific delineation of ischemic tissue. These techniques also can play a role in selecting patients who may benefit from thrombolytic therapy. This article reviews physical, technical, and pathophysiological background material that can be helpful in the acquisition and interpretation of DWI and PWI.