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Öğe Adrenoleukodystrophy: Magnetic Resonance and diffusion weighted imaging findings(2018) Atalar, Mehmet HaydarAdrenoleukodystrophy (ALD) is a rare genetic disorder characterized by adrenal failure affecting adrenal cortex andcentral nervous system and demyelination-related neurological signs. The basic histopathological properties of thisdisorder are white matter demyelination and axonal loss. In patients diagnosed with a leukodystrophy such as ALD,magnetic resonance imaging (MRI) is the primary imaging modality for characterization, localization, and differentialdiagnosis of underlying white matter abnormalities. Herein, we aimed to report the contribution of MRI and diffusionweightedimaging (DWI) findings to clinical findings of the disorder in a 9-year-old boy diagnosed withadrenoleukodystrophy.Öğe Aggressive Angiomyxoma of the Pelvis and Perineum: A Case Report with Radiologic-Pathologic Correlation(2022) Yılmaz, Gökhan; Atalar, Mehmet Haydar; Başpınar, Nisa; Yeldir, Nese; Yildirir, Ali CihanAggressive angiomyxoma is a rare mesenchymal tumor mostly observed in women of childbearing age. Although it is often lo- cated in the vulva, it can also be observed in the paravaginal, perirectal areas, perineum and pelvis. It appears as a locally aggressive, large, in- filtrative mass. Complete surgical excision is often difficult and has high recurrence rates. Magnetic resonance imaging (MRI) plays an important role in preoperative diagnosis of aggressive angiomyxoma. The typical swirling appearance on T2-weighted and post-contrast T1-weighted MRI series is diagnostic for aggressive angiomyxoma. Here, we present a 51-year-old female patient with pelvic-perineal aggressive angiomyxoma, accompanied by radiological and pathological findings.Öğe Assessment of sphenoid sinus related anatomic variations with computed tomography(AFRICAN FIELD EPIDEMIOLOGY NETWORK-AFENET, 2017) Turkdogan, Figen Tunali; Turkdogan, Kenan Ahmet; Dogan, Murat; Atalar, Mehmet HaydarIntroduction: Frequent and broad application of endoscopic sinus surgery (ESS) in parallel with experience makes it imperative to know the anatomy and the existing pathology very well before surgery. This study examines the association between anomalies in the sphenoid sinus area in paranasal sinuses computed tomography (PNS-CT) and pathological findings and determines variations of sphenoid sinus. Methods: A total of 200 cases (100 women, 100 men) who had PNS-CT in the emergency and radiology polyclinics within the period of one year were included in this study. Bone tissue anomalies and soft tissue pathologies were assessed in the CT. Results: Pterygoid process was found in 36.75% of our cases, anterior clinoid pneumatization was found in 21.25%; vidian canal in 34.25%, foramen rotundum in 17.5% and ICA in 12.75% had protrusion into the sphenoid sinus; 8.25% were found to have onodi cell, 11.25% were found to have multiple septation, 16.75% were found to have mucosal thickening and 2.5% were found to have retention cyst. Conclusion: The importance of PNS-CT in terms of determining anatomic variations before ESC and predicting possible complications during surgery has been emphasized once more. In our study, as sphenoid sinus pneumatization increased, the projection of neighbouring vein and nerve structures into the sinus was found to increase as well.Öğe Association of plasma homocysteine level and carotid intima-media thickness in rheumatoid arthritis patients receiving methotrexate(Turkish League Against Rheumatism (TLAR), 2015) Hayta, Emrullah; Hizmetli, Sami; Atalar, Mehmet Haydar; Çinar, ZiynetObjectives: This study aims to evaluate the relationship between serum homocysteine levels and atherosclerotic plaques in carotid arteries in female patients with rheumatoid arthritis (RA). Patients and methods: Fifty-eight females with RA (mean age 45.50±11.69 years; range 42 to 60 years) and 22 female controls (mean age 47.3±8.9 years; range 38 to 62 years) with mechanical low back pain were included in the study. RA patients were divided into two groups: patients who were under methotrexate (MTX) therapy at least for two years (MTX group, n=32), and patients who did not receive MTX at least for past two years (non-MTX-disease-modifying antirheumatic drug group, n=26). RA patients’ disease activity scores in 28 joints were calculated. Carotid intima-media thickness and presence of atherosclerotic plaque were evaluated by high-resolution B-mode ultrasonography. Results: Plasma homocysteine levels were higher in MTX and non-MTX-disease-modifying antirheumatic drug groups compared to controls (16.88±6.84 and 10.37±2.54 ?mol/L, respectively) and the difference was statistically significant (p=0.001). In MTX, non-MTX-disease-modifying antirheumatic drug and control groups, atherosclerotic plaque was detected in 11 (34.5%) and four (15.4%) patients, and one patient (4.5%), respectively. Carotid intima-media thickness was significantly higher in MTX group compared to other two groups and the difference was statistically significant (p=0.002). Pearson correlation analysis revealed a significant correlation between intima-media thickness and homocysteine levels in MTX group (r=0.49, p=0.006). Conclusion: According to our study results, methotrexate treatment in female patients with RA increases plasma homocysteine levels and prevalence of atherosclerotic plaque. High homocysteine levels in these patients may be a cause of atherosclerosis. © 2015 Turkish League Against Rheumatism. All rights reserved.Öğe Beaver tail liver(SPRINGER, 2018) Atalar, Mehmet Haydar; Karakus, KayhanAlso known as the sliver of liver, beaver tail liver is an anatomic variation of the liver where its left lobe extends laterally to contact and enclose the spleen. Hepatic parenchyma is normal. It may be difficult to distinguish the two organs from each other when both have equal echogenicity or density in ultrasonography and computed tomography. Therefore, it may mimic a splenic trauma or a perisplenic hemorrhage or subcapsular hematoma within the splenic parenchyma.Öğe Canavan Disease as a Rare Cause of Leukodystrophy: MRI and MRS Findings(Turkish Neurological Soc, 2021) Atalar, Mehmet Haydar; Gul, Enes; Atik, Irfan; Yildiz, Ozlem Kayim[Abstract Not Available]Öğe Carotid artery Doppler ultrasonography in patients with chronic kidney disease(INT SCIENTIFIC LITERATURE, INC, 2014) Salk, Ismail; Yildiz, Gursel; Egilmez, Hulusi; Atalar, Mehmet Haydar; Candan, Ferhan; Cetin, AliBackground: We investigated the changes in the values of carotid intima-media thickness (IMT) and Doppler index measurements in the autosomal dominant polycystic kidney disease (ADPKD), peritoneal dialysis (PD), and hemodialysis (HD) patients. Material/Methods: Twenty outpatients on HD (mean age 46.1 +/- 16.4), 27 outpatients on PD (mean age 45 +/- 12.4), and 26 normotensive outpatients with ADPKD (mean age 52.4 +/- 16.7) as the case groups and 21 healthy subjects (mean age 48.4 +/- 7.2), as the control group, were included. The participants underwent ultrasonography of the common, right, and left carotid arteries for the IMT and Doppler flow measurements. Results: Overall, compared to the normal group, in the study groups, the IMT and peak systolic velocity (PSV), end-diastolic velocity (EDV), resistive index (RI), and pulsatility index (PI) were significantly higher in common carotid arteries; however, their differences were not meaningful in internal carotid arteries (p<0.05). Conclusions: Overall, ADPKD, PD, and HD increase the IMT, PSV, EDV, RI, and PI values of CCA; however, their effect considerable less on the study parameters of ICA. There is no considerable difference among the effects of ADPKD, HD, and PD on the study parameters. Of CKD patients during the first diagnostic and follow-up workups, the measurements of carotid IMT and Doppler indices may provide valuable data for improving success of the clinical management.Öğe Case Report: Isolated Renal Hydatid Cyst in a Boy(Galenos Publishing House, 2019) Cankorkmaz, Levent; Korğalı, Esat; Atalar, Mehmet Haydar; Köylüoğlu, GökhanHydatic cyst is a crucial and prevalent parasitic disease in the developing countries in the Mediterranean region. Its diagnosis is sometimes problematic because of non-specific complaints and unavailability of any positive results in a routine laboratory analysis. Isolated renal hydatid cysts are very rare. In this study, a primary left renal hydatid cyst which was found in a 12-year-old boy was presented. He was referred by another hospital to our department with a flank pain and cystic mass in left kidney. Indirect haemagglutination test (IHA) for Echinococcus was negative. Nephrectomy was performed with the diagnosis of renal cyst hydatic. Renal cyst hydatid may present with various clinical findings ranging from asymptomatic clinical course to total loss in renal function. It will be beneficial to consider a renal hydatid cyst in patients with blurred flank pain, even if IHA is negative. © Telif hakkı 2019 Türkiye Parazitoloji Derneği-Makale.Öğe Comparison of Different Slice Thicknesses on Chest Computed Tomography for Evaluation of COVID-19-Associated Pneumonia(Aves, 2022) Atasoy, Dilara; Cetinkaya, Nazim; Caylak, Halil; Sariismailoglu, Ragip; Atalar, Mehmet HaydarOBJECTIVE: To compare the value of chest computed tomography at 1-mm and 5-mm slice thickness in terms of computed tomography severity score and computed tomography evaluation time in the diagnosis of COVID-19. MATERIAL AND METHODS: Sixty-five patients were included in the study group who are reverse-transcription polymerase chain reaction-positive for COVID-19 and had chest computed tomography. The 1 mm and 5 mm reconstructed images were evaluated in 2 different sessions with 4-week intervals by 2 certificated general radiologists. The presence of COVID-19-related findings, COVID-19 final category, and evaluation time were recorded. Thin and thick slices were compared for these variables and inter-reader reliability calculated with the Statistical Package for the Social Sciences (SPSS) for Windows. RESULTS: There was no significant difference between the COVID-19-related findings on thorax computed tomography between 1-mm and 5-mm slices except crazy paving appearance, microvascular enlargement, and septa! thickening. The frequency of the final categories of computed tomography results was consistent between the thick and thin slices. The computed tomography assessment time was significantly lower in 5 mm slices. The inter-reader reproducibility analysis results demonstrated good and excellent reproducibility of measurements between readers for both slice thicknesses. CONCLUSION: It was found that 5-mm reconstruction thickness of chest computed tomography can be employed for the initial detec- tion of COVID-19-related findings and the final diagnostic category-related COVID-19 rather than 1-mm slices with a faster availability of results which can be beneficial on pandemic hospitals.Öğe Confirming the brain death diagnosis using brain CT angiography: experience in Tokat State Hospital(E-CENTURY PUBLISHING CORP, 2014) Karakus, Kayhan; Demirci, Seden; Cengiz, Aysun Yakut; Atalar, Mehmet HaydarObjective: Fourteen brain death cases diagnosed in Mart 2012-May 2013 period in Tokat State Hospital were studied retrospectively. CT angiography experience about those cases was shared, and use of CT angiography in confirmation of brain death was discussed. Material and Methods: All 14 cases were patients on mechanical ventilator, who did not respond to medical and surgical treatments at intensive care unit and were diagnosed clinically with brain death. All of these patients had CT angiography as a confirmatory test using a 4-slice CT scanner in Radiology department in Tokat State Hospital. Findings: Six of the patients were female and eight were male. All of them were referred from intensive care unit and had clinical brain death diagnosis before CT angiography. In the evaluation of CTA, four-point scoring involving opacification loss in both ICVs and cortical segments of MCA was used. CTA examinations confirmed brain death diagnoses in all patients who had clinical brain death diagnoses, and no confliction between CTA findings and clinical diagnoses was observed. Conclusion: Demonstrating the lack of cerebral circulation is a necessity for confirmation of brain death diagnosis. While conventional angiography remains the standard method, CTA emerged as an alternative method. In parallel to increase in prevalence of organ implants, CTA, a fast and efficient method, has been increasingly used in confirmation of brain death diagnoses.Öğe Cranial MRI findings in a case with Seckel syndrome(2018) Atalar, Mehmet HaydarSeckel’s syndrome (SS) is a rare, heterogeneous form of primordial dwarfism. The presence of mental retardation andneurologic signs is one of the peculiar features of this syndrome. We herein present the cranial MR findings in a childpatient with Seckel's syndrome.Öğe Crossed Cerebellar Diaschisis(TURKISH NEUROLOGICAL SOC, 2018) Yildiz, Bulent; Kose, Neslihan; Atalar, Mehmet Haydar; Caylak, Halil; Yildiz, Ozlem Kayim…Öğe CT and MR Imaging in a Large Series of Patients with Craniofacial Fibrous Dysplasia(INT SCIENTIFIC INFORMATION INC, 2015) Atalar, Mehmet Haydar; Salk, Ismail; Savas, Recep; Uysal, Ismail Onder; Egilmez, HulusiBackground: In this retrospective review of patients with craniofacial fibrous dysplasia (FD), the clinical and radiological findings of CT and MR scan were analyzed. Material/Methods: The study material included 32 patients, at 9 to 68 years of age that were directed for differential diagnostics of several disorders in the head. We recorded CT and MRI data related to the lesion number, location, sidedness, appearance, and sex of the cases with craniofacial FD. Results: Of 32 patients involved in this study, 17 had monostotic and 15 had polyostotic involvement pattern. Bones most commonly involved by monostotic involvement in females were, in descending order, mandibular, maxillary, and sphenoid bones, while the sphenoid bone was involved the most in males. Leontiasis ossea was observed in 2 patients. Sclerotic and mixed lesion types were more common in both females and males. In T1-and T2-weighted MRI sequences, hypointensity was more common compared to hyperintensity or heterogeneous intensity. The type of enhancement of lesions was found similar after contrast medium administration. Conclusions: In the presence of craniofacial FD during CT or MRI imaging of the head, a detailed description of FD lesions may provide an important clinical benefit by increasing radiological experience during the diagnostics of this rare disorder.Öğe Diagnosis of High Bifurcation of the Abdominal Aorta with Associated Vascular Variations: Case Report with Multidedector Computed Tomography(INT SCIENTIFIC INFORMATION INC, 2015) Atalar, Mehmet Haydar; Salk, Ismail; Bozbiyik, Nisa; Cetin, AliBackground: Variations of the branches and bifurcation of the abdominal aorta and their relations with other abdominal structures and organs are important concerning abdominal and spinal surgery. Case Report: In this report, authors present a high - positioned bifurcation of the abdominal aorta at the level of the L3 vertebral body and its associations with multiple variations of other abdominal arteries during contrast-enhanced multi-detector computed tomography (MDCT) examination of the abdomen. Conclusions: We reported on a unique clinically and surgically significant case of variations of the abdominal aorta as related to the location and type of bifurcation. The awareness of the variations of the abdominal aorta is of great importance for surgeons in order to reduce complications during abdominal and spinal interventions, as well as for radiologists for precise interpretation of angiograms.Öğe Diffusion Tensor Imaging in a Patient with Joubert Syndrome(Turkish Neurological Soc, 2019) Atalar, Mehmet Haydar; Yildiz, Bulent; Yildiz, Ozlem Kayim[Abstract Not Available]Öğe Dystrophic intracranial calcification accompanying varix of the dural sinus and arteriovenous malformation(Turkish Neurosurgical Society, 2018) Atalar, Mehmet Haydar; Şener, Rıfat Nuri; Yıldız, Bülent; Yıldız, Özlem Kayım[No abstract available]Öğe Ender Bir Olgu: Bir Bebekte İki Taraflı Abdominoskrotal Hidrosele Bağlı İki Taraflı Hidronefroz(2020) Cankorkmaz, Levent; Atalar, Mehmet Haydar; Şalk, İsmail; Köylüoğlu, GökhanAbdominoskrotal hidrosel 1834 yılında Dupuytren tarafından tanımlanan ender görülen bir patolojidir. Abdominoskrotal hidroselin etiyolojisi tam olarak aydınlatılamamıştır. Abdominoskrotal hidrosele bağlı ender görülen komplikasyonlardan bazıları, tunika vajinalis malign mezotelyoma, hidroüreter/hidronefroz, testiküler düzleşmedir. Bu makalede, iki taraflı abdominoskrotal hidrosel basısına ikincil, iki taraflı hidronefroz saptanan yedi aylık bir erkek hasta sunulmaktadır. Hastaya iki taraflı hidroselektomi gerçekleştirildi. Postoperatif seyir sorunsuz geçti. Ameliyattan altı ay sonra yapılan renal ultrasonografi normaldi. Bu patoloji çok ender olsa da, çocuklardaki alt karın kitlelerinin ayırıcı tanısı ve hidronefroz nedeni olarak akılda tutulmalıdır. Cerrahi olarak çıkartıldıktan sonra, genellikle hidronefroz gerilemesi de dâhil, iyileşme tamdır.Öğe Evaluation of the contralateral hemisphere with DWI in pediatric patients with Dyke-Davidoff-Masson syndrome(Springer Heidelberg, 2024) Gul, Enes; Atalar, Mehmet Haydar; Atik, IrfanIntroductionDyke-Davidoff-Masson Syndrome (DDMS) is a clinical syndrome that causes different clinical symptoms and is defined by volume decrement in one cerebral hemisphere. In this study, we aimed to evaluate the involvement of the normal-appearing contralateral hemisphere in 16 pediatric patients with DDMS using diffusion-weighted imaging (DWI).Materials and methodsBrain MRIs were retrospectively reviewed between January 2014 and January 2023. Sixteen pediatric patients radiologically compatible with DDMS were included in the study. Sixteen children who had undergone brain MRI, most commonly for headaches and whose MRI findings had been completely normal, were included as the control group. Apparent diffusion coefficient (ADC) values of the deep gray and white matter of the normal-appearing hemisphere in the patient group were calculated and compared with that of the control group.ResultsThe ADC values of the gray and white matters of the patient and control groups were not statistically different. However, in the patient group, the ADC values of the gray and white matters in males were remarkably lower than in females (p = 0.038, p = 0.037, respectively).ConclusionThe difference in the ADC values of the contralateral hemisphere between females and males in the patient group suggests that the normal-appearing hemisphere may have been affected by DDMS. Although, the exact mechanism of this effect is not known. Therefore, in patients with DDMS, contralateral hemisphere involvement in cerebral hemiatrophy and hemispherectomy should be evaluated clinically and radiologically.Öğe Horizontal Gaze Palsy Associated with Progressive Scoliosis: Magnetic Resonance Imaging Findings(Galenos Publ House, 2023) Atalar, Mehmet Haydar; Yildiz, oezlem Kayim; Baspinar, Nisa[Abstract Not Available]Öğe Isolated Gallbladder Perforation As a Result of With a Knitt Ing Needle: a Home Accident(Acıbadem Mehmet Ali Aydınlar Üniversitesi, 2012) Cankorkmaz, Levent; Atalar, Mehmet Haydar; Özer, Hatice; Köylüoğlu, GökhanIsolated gallbladder perforation following penetrating abdominal trauma is rare. We present hereby an isolated gallbladder rupture caused by penetrating abdominal trauma in a boy; since the of gallbladder is rarely affected in this setting. A 5- year-old boy presented with a penetrating inj ury with knitting needles to the abdomen while playing at home. He had abdominal pain, vomiting and was lethargic at admission. On physical examination, there was abdominal tenderness. Ultrasonography and computed tomography of the ab domen revealed pericholecystic free fluid, while there was no free gas in abdominal X-ray. Urgent laparotomy was perfo rmed. Exploration revealed isolated gallbladder perforation for which cholecystectomy was done
