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| 1 | Radiological imaging findings of scheuermann disease显示文摘AIM To find accompanying anomalies of typical and atypical Scheuermann's disease(SD) is reported in the present study. METHODS Study included 20 patients(16 men and 4 women) who had radiological imaging radiography, magnetic resonance imaging(MRI) and computed tomography, if available, due to back pain, curved back and low back pain in November 2011-February 2016 period. Patients were categorized into typical and atypical patterns based on the region involved. Thoracic kyphosis values were measured using real Cobb angle. Accompanying disc degeneration, herniations and spinal cord pathologies were studied using MRI.RESULTS Age of the patients ranged from 11.0 to 23.0(mean 17.2 ± 3.0). Typical pattern of SD were detected in 15 patients while atypical pattern were detected in 5 patients. Cobb angle range was 40.2-67.2(mean 55.5 ± 8.7) in typical Scheuermann's patients and 24.7-49.9(mean 36.7 ± 10.8) in atypical ones. Intervertebral level was affected and had the measures of 3-8(mean 5.3 ± 1.6) and 7-9(mean 8.2 ± 0.8) in typical and atypical Scheuermann's patients, respectively. Level of degenerative disc disease in MRI was 1-7 discs(mean 4.1 ± 1.7) in typical patients and 5-10 discs(mean 7.6 ± 1.9) in atypical patients.CONCLUSION SD can be seen in typical and atypical patterns, typical being more frequent. Because degenerative disc diseases,herniations and cord pathologies such as syringomyelia can accompany SD(albeit more common in atypical pattern), it is necessary to evaluate these patients with plain radiography and MRI together. | Erkan Gokce Murat Beyhan | 2016 | World Journal of Radiology2016，8，11： | 2 |
| 2 | Advanced magnetic resonance imaging findings in salivary gland tumors显示文摘Salivary gland tumors(SGTs)make up a small portion(approximately 5%)of all head and neck tumors.Most of them are located in the parotid glands,while they are less frequently located in the submandibular glands,minor salivary glands or sublingual gland.The incidence of malignant or benign tumors(BTs)in the salivary glands varies according to the salivary gland from which they originate.While most of those detected in the parotid gland tend to be benign,the incidence of malignancy increases in other glands.The use of magnetic resonance imaging(MRI)in the diagnosis of SGTs is increasing every day.While conventional sequences provide sufficient data on the presence,localization,extent and number of the tumor,they are insufficient for tumor specification.With the widespread use of advanced techniques such as diffusion-weighted imaging,semiquantitative and quantitative perfusion MRI,studies and data have been published on the differentiation of malignant or BTs and the specificity of their subtypes.With diffusion MRI,differentiation can be made by utilizing the cellularity and microstructural properties of tumors.For example,SGTs such as high cellular Warthin’s tumor(WT)or lymphoma on diffusion MRI have been reported to have significantly lower apparent diffusion values than other tumors.Contrast agent uptake and wash-out levels of tumors can be detected with semiquantitative perfusion MRI.For example,it is reported that almost all of the pleomorphic adenomas show an increasing enhancement time intensity curve and do not wash-out.On quantitative perfusion MRI studies using perfusion parameters such as Ktrans,Kep,and Ve,it is reported that WTs can show higher Kep and lower Ve values than other tumors.In this study,the contribution of advanced MRI to the diagnosis and differential diagnosis of SGTs will be reviewed. | Erkan Gökçe Murat Beyhan | 2022 | World Journal of Radiology2022，14，8： | 2 |
| 3 | Magnetic resonance imaging findings of redundant nerve roots of the cauda equina显示文摘BACKGROUND Redundant nerve roots(RNRs)of the cauda equina are often a natural evolutionary part of lumbar spinal canal stenosis secondary to degenerative processes characterized by elongated,enlarged,and tortuous nerve roots in the superior and/or inferior of the stenotic segment.Although magnetic resonance imaging(MRI)findings have been defined more frequently in recent years,this condition has been relatively under-recognized in radiological practice.In this study,lumbar MRI findings of RNRs of the cauda equina were evaluated in spinal stenosis patients.AIM To evaluate RNRs of the cauda equina in spinal stenosis patients.METHODS One-hundred and thirty-one patients who underwent lumbar MRI and were found to have spinal stenosis between March 2010 and February 2019 were included in the study.On axial T2-weighted images(T2WI),the cross-sectional area(CSA)of the dural sac was measured at L2-3,L3-4,L4-5,and L5-S1 levels in the axial plane.CSA levels below 100 mm^2 were considered stenosis.Elongation,expansion,and tortuosity in cauda equina fibers in the superior and/or inferior of the stenotic segment were evaluated as RNRs.The patients were divided into two groups:Those with RNRs and those without RNRs.The CSA cut-off value resulting in RNRs of cauda equina was calculated.Relative length(RL)of RNRs was calculated by dividing the length of RNRs at mid-sagittal T2WI by the height of the vertebral body superior to the stenosis level.The associations of CSA leading to RNRs with RL,disc herniation type,and spondylolisthesis were evaluated.RESULTS Fifty-five patients(42%)with spinal stenosis had RNRs of the cauda equina.The average CSA was 40.99±12.76 mm^2 in patients with RNRs of the cauda equina and 66.83±19.32 mm^2 in patients without RNRs.A significant difference was found between the two groups for CSA values(P<0.001).Using a cut-off value of 55.22 mm^2 for RNRs of the cauda equina,sensitivity,specificity,positive predictive value(PPV),and negative predictive value(NPV)values of 96.4%,96.1%,89.4%,and 98.7%were obtained,respectively.RL was 3.39±1.31(range:0.93-6.01).When the extension of RNRs into the superior and/or inferior of the spinal canal stenosis level was evaluated,it was superior in 54.5%,both superior and inferior in 32.8%,and inferior in 12.7%.At stenosis levels leading to RNRs of the cauda equina,29 disc herniations with soft margins and 26 with sharp margins were detected.Disc herniation type and spondylolisthesis had no significant relationship with RL or CSA of the dural sac with stenotic levels(P>0.05).As the CSA of the dural sac decreased,the incidence of RNRs observed at the superior of the stenosis level increased(P<0.001).CONCLUSION RNRs of the cauda equina are frequently observed in patients with spinal stenosis.When the CSA of the dural sac is<55 mm^2,lumbar MRIs should be carefully examined for this condition. | Erkan Gökçe Murat Beyhan | 2021 | World Journal of Radiology2021，13，1： | 2 |
| 4 | Stable Modeling Based Control Methods Using A New RBF Network 显示文摘 | Selami Beyhan Musa Ale | 2010 | ISA Transactions (S0019-0578)2010，49，4： | 1 |
| 5 | Total phenolic compounds and antioxidant capacity of leaf, dry fruit and fresh fruit of feijoa (Accasellowiana, Myrtaceae)显示文摘 | Beyhan O Elmasta- M Gedikli F | 1990 | J Med Plants Res1990，4，10： | 1 |
| 6 | Cyclic-diGMP signal transduction systems in Vibrio cholerae: modulation of rugosity and biofilm formation 显示文摘 | Lim B Beyhan S Meir J | 2006 | Mol Microbial2006，60，2： | 1 |
| 7 | Identification and characterization of cyclic diguanylate signaling systems controlling rugosity in Vibrio cholerae 显示文摘 | Beyhan S Oden L S Yildiz F H | 2008 | J Bacteriol2008，190，22： | 1 |
| 8 | Fuzzy functions based ARX model and new fuzzy basis function models for nonlinear system identification显示文摘 | Selami Beyhan Musa Alci | 2009 | Applied Soft Computing Journal2009，，2： | 1 |
| 9 | Does instantaneous blood glucose affect vibration perception threshold measurement using biothesiometer 显示文摘 | Damci T Osar Z Beyhan S | 1999 | Diabetes Res Clin Pract1999，46，1： | 1 |
| 10 | Development potential of bovine nuclear transfer embryos produced using different types of adult donor cells 显示文摘 | Beyhan Z Mitalipova M Chang T | 2000 | Theriogenology2000，53，1： | 1 |
| 11 | Giardia muris infection in laboratory rats(Rattus norvegicus)and treatment with metronidazole显示文摘 | Beyhan YE Hokelek M | 2014 | Turkiye Parazitol Derg2014，38，3： | 1 |
| 12 | Developmental potential of bovine nuclear transfer embryos produced using different types of adult donor cells显示文摘 | Beyhan Z Mitalipova M Chang T | 2000 | Theriogenology2000，53，： | 1 |
| 13 | Comparison of sufentanil with sufentanil plus magnesium sulphate for sedation in the intensive care unit using bispectral index 显示文摘 | Dilek M Alparslan T Beyhan K | 2003 | Crit Care2003，7，5： | 1 |
| 14 | Bovine ocyte cytoplasm supports development of embryos produced by nuclear transfer of somatic cell nuclei from various mammalian species显示文摘 | Dominko T Massam M Haley B Beyhan Z Melili E Mckusick B First N L | | 0，，： | 1 |
| 15 | Ghrelin alleviates biliary obstruction-induced chronic he- patic injury in rats 显示文摘 | Sevgin Ozlem Iseri Gksel Sener Beyhan Saglam | 2008 | Regul Peptides2008，146，13： | 1 |
| 16 | Developmental potential of bovine nuclear transfer embryos produced using different types of adult donor cells显示文摘 | Beyhan Z Mitalipova M Chang T | 2000 | Theriogenology2000，53，： | 1 |
| 17 | Chemical and textural controls on phosphorus mobility in drylands of southeastern Utah显示文摘 | Susan E. Buckingham Jason Neff Beyhan Titiz-Maybach Richard L. Reynolds | 2010 | Biogeochemistry2010，，1： | 1 |
| 18 | Pluripotency of bovine embryonic eellline derived from preeompaeting embryos 显示文摘 | Mitalipova M Beyhan Z First NL | 2001 | Cloning2001，3，2： | 1 |
| 19 | Devehpmental potential of bovine nuclear transfer embryos produced using different types of adult donor cells 显示文摘 | Beyhan Z Mitaljpova M Chamy T | 2000 | Theriogenology2000，53，： | 1 |
| 20 | Invasive aspergillosis in solid-organ transplantation: report of eight cases and review of the literature显示文摘 | Funda Ergin Hande Arslan Alpay Azap Beyhan Demirhan Hamdi Karakayal? Mehmet Haberal | 2003 | Transplant International2003，，4： | 1 |
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