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https://www.readbyqxmd.com/read/29928449/primary-cauda-equina-lymphoma-diagnosed-by-nerve-biopsy-a-case-report-and-literature-review
#1
Kayo Suzuki, Taketoshi Yasuda, Toshihito Hiraiwa, Masahiko Kanamori, Tomoatsu Kimura, Yoshiharu Kawaguchi
Primary cauda equina lymphoma (CEL) is a rare malignant tumor among various neoplasms that affects the cauda equina nerve roots. The present case report described the case of a 65-year-old man who presented with cauda equina syndrome with progressive motor palsy in the legs and gait disturbance over the last 5 months. Magnetic resonance (MR) images showed enlargement of the cauda equina occupying the dural sac from the L1-S1 level with isointensity to the spinal cord signal on both T1- and T2-weighted imaging...
July 2018: Oncology Letters
https://www.readbyqxmd.com/read/29927634/detection-of-recurrent-hepatocellular-carcinoma-after-surgical-resection-non-contrast-liver-mr-imaging-with-diffusion-weighted-imaging-versus-gadoxetic-acid-enhanced-mr-imaging
#2
Ji Hye Min, Young Kon Kim, Seo-Youn Choi, Tae Wook Kang, Woo Kyoung Jeong, Kyunga Kim, Ho-Jeong Won
OBJECTIVES: To compare the diagnostic performance of non-contrast liver magnetic resonance (MR) imaging to whole MR imaging using gadoxetic acid for detection of recurrent hepatocellular carcinoma (HCC) after hepatectomy. METHODS: This retrospective study analyzed 483 patients who underwent surveillance with liver MR imaging after hepatectomy for HCC (median time interval, 7.7 months). Non-contrast MR imaging set (T1-and T2 -weighted and diffusion-weighted images [DWI]) and whole MR imaging set (gadoxetic acid-enhanced and non-contrast MR imaging) were analyzed independently by two observers...
June 21, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29924802/reference-values-of-vessel-diameters-stenosis-prevalence-and-arterial-variations-of-the-lower-limb-arteries-in-a-male-population-sample-using-contrast-enhanced-mr-angiography
#3
Roberto Lorbeer, Andreas Grotz, Marcus Dörr, Henry Völzke, Wolfgang Lieb, Jens-Peter Kühn, Birger Mensel
INTRODUCTION: Morphological characterization of leg arteries is of significant importance to detect vascular remodeling triggered by atherosclerotic changes. We determined reference values of vessel diameters and assessed prevalence of stenosis and arterial variations of the lower limb arteries in a healthy male population sample. METHODS: Gadolinium-enhanced magnetic resonance angiography at 1.5 Tesla was performed in 756 male participants (median age = 52 years, range = 21-82 years) of the population-based Study of Health in Pomerania...
2018: PloS One
https://www.readbyqxmd.com/read/29924716/tumor-surface-regularity-at-mr-imaging-predicts-survival-and-response-to-surgery-in-patients-with-glioblastoma
#4
Julián Pérez-Beteta, David Molina-García, José A Ortiz-Alhambra, Antonio Fernández-Romero, Belén Luque, Elena Arregui, Manuel Calvo, José M Borrás, Bárbara Meléndez, Ángel Rodríguez de Lope, Raquel Moreno de la Presa, Lidia Iglesias Bayo, Juan A Barcia, Juan Martino, Carlos Velásquez, Beatriz Asenjo, Manuel Benavides, Ismael Herruzo, Antonio Revert, Estanislao Arana, Víctor M Pérez-García
Purpose To evaluate the prognostic and predictive value of surface-derived imaging biomarkers obtained from contrast material-enhanced volumetric T1-weighted pretreatment magnetic resonance (MR) imaging sequences in patients with glioblastoma multiforme. Materials and Methods A discovery cohort from five local institutions (165 patients; mean age, 62 years ± 12 [standard deviation]; 43% women and 57% men) and an independent validation cohort (51 patients; mean age, 60 years ± 12; 39% women and 61% men) from The Cancer Imaging Archive with volumetric T1-weighted pretreatment contrast-enhanced MR imaging sequences were included in the study...
July 2018: Radiology
https://www.readbyqxmd.com/read/29924022/management-of-testicular-leydig-cell-tumor-a-case-report
#5
Jianguo Zhu, Yun Luan, Haige Li
RATIONALE: Testicular Leydig cell tumor (LCT) is a rare neoplasm. It commonly presents as a painless testicular mass with or without endocrine changes. Histological and immunohistochemical examination play important roles in differentiating LCT from testicular germ cell tumors. PATIENT CONCERNS: We highlight the imaging phenotype, as well as the pathological findings of a case of LCT in a 62-year-old male. DIAGNOSES: Preoperative noncontrast CT scan of the abdomen revealed a 7...
June 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29922927/improved-display-of-cervical-intervertebral-discs-on-water-iodine-images-incidental-findings-from-single-source-dual-energy-ct-angiography-of-head-and-neck-arteries
#6
Qingxia Wu, Dapeng Shi, Tianming Cheng, Hongming Liu, Niuniu Hu, Xiaowan Chang, Ying Guo, Meiyun Wang
OBJECTIVE: To (a) assess the diagnostic performance of material decomposition (MD) water (iodine) images for the evaluation of cervical intervertebral discs (IVDs) in patients who underwent dual-energy head and neck CT angiography (HNCTA) compared with 70-keV images and (b) to explore the correlation of water concentration with the T2 relaxation time of IVDs. MATERIALS AND METHODS: Twenty-four consecutive patients who underwent dual-energy HNCTA and cervical spine MRI were studied...
June 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29922503/the-effect-of-axial-loading-on-ulnar-variance
#7
Kagan Ozer, Andy F Zhu, Breana Siljander, Jeffrey N Lawton, Jennifer F Waljee
Background  Forearm rotation results in change in ulnar variance. Axial loading of the wrist is required to maintain daily activities. Change in ulnar variance during axial loading has not been investigated previously. Purpose  To measure the change in ulnar variance on axially loaded wrists. Patients and Methods  We examined 21 asymptomatic individuals and 24 patients with unilateral ulnar-sided wrist pain. All patients underwent standard neutral posteroanterior wrist radiographs without load and under axial loading on bilateral wrists...
July 2018: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/29911203/automated-voxel-placement-a-linux-based-suite-of-tools-for-accurate-and-reliable-single-voxel-coregistration
#8
Eric A Woodcock, Muzamil Arshad, Dalal Khatib, Jeffrey A Stanley
Background: Single-voxel proton magnetic resonance spectroscopy (1 H MRS) is a powerful technique for studying in vivo neurochemistry, but has an often-overlooked source of error variance: inconsistent voxel placement between scans. We developed and evaluated an Automated Voxel Placement (AVP) procedure for accurate and reliable 1 H MRS voxel prescription. AVP is a suite of Linux-based programs that facilitate automated template-driven single-voxel coregistration. Methods: Three studies were conducted to evaluate AVP for prescription of one voxel: left dorsolateral prefrontal cortex...
2018: Journal of Neuroimaging in Psychiatry & Neurology
https://www.readbyqxmd.com/read/29910162/corpus-callosum-and-cerebellar-vermis-size-in-very-preterm-infants-relationship-to-long-term-neurodevelopmental-outcome
#9
Po-Ming Wu, Hsin-I Shih, Wen-Hao Yu, Li-Wen Chen, Lie-Chuan Wang, Chao-Ching Huang, Yi-Fang Tu
BACKGROUND: The neonatal changes of corpus callosum or cerebellar volume in preterm infants have been shown to link with abnormal mentality and motor disability in early childhood. This study aims to predict the long-term neurological outcomes by measuring these changes on neonatal brain ultrasound in preterm infants. METHODS: Our cohort consisted of infants aged below 32 weeks' gestation with very low birth body weights who completed neuro-assessments at 5 years of age...
June 1, 2018: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/29908637/dce-mri-reveals-early-decreased-and-later-increased-placenta-perfusion-after-a-stress-challenge-during-pregnancy-in-a-mouse-model
#10
Chressen Catharina Remus, Fabian Kording, Petra Arck, Emilia Solano, Jan Sedlacik, Gerhard Adam, Kurt Hecher, Nils Daniel Forkert
OBJECTIVES: Stress during pregnancy is known to have negative effects on fetal outcome. The purpose of this exploratory study was to examine placental perfusion alterations after stress challenge during pregnancy in a mouse model. MATERIAL AND METHODS: Seven Tesla MRI was performed on pregnant mice at embrionic day (ED) 14.5 and 16.5. Twenty dams were exposed to an established acoustic stress challenge model while twenty non-exposed dams served as controls. Placental perfusion was analyzed in dynamic contrast-enhanced (DCE) MRI using the steepest slope model...
May 2018: Placenta
https://www.readbyqxmd.com/read/29908312/detection-of-neural-light-scattering-activity-in-vivo-optical-transmittance-studies-in-the-rat-brain
#11
Wen-Ju Pan, Seung Yup Lee, Jacob Billings, Maysam Nezafati, Waqas Majeed, Erin Buckley, Shella Keilholz
Optical studies of ex vivo brain slices where blood is absent show that neural activity is accompanied by significant intrinsic optical signals (IOS) related to activity-dependent scattering changes in neural tissue. However, the neural scattering signals have been largely ignored in vivo in widely-used IOS methods where absorption contrast from hemoglobin was employed. Changes in scattering were observed on a time scale of seconds in previous brain slice IOS studies, similar to the time scale for the hemodynamic response...
June 13, 2018: NeuroImage
https://www.readbyqxmd.com/read/29906625/computed-tomography-and-magnetic-resonance-imaging-findings-of-pancreatic-hamartoma-a-case-report-and-literature-review
#12
Yeo Eun Han, Beom Jin Park, Deuk Jae Sung, Min Ju Kim, Na Yeon Han, Ki Choon Sim, Sung Bum Cho, Joo Young Kim
Pancreatic hamartoma is a rare benign malformation that resembles a neoplasm and may be mistaken for a malignancy. The imaging findings of pancreatic hamartoma are not well established, as only one radiological case report has been described since 1983. Herein, we discussed a case of pancreatic hamartoma in a 35-year-old woman and conducted a literature review focused on imaging findings and differential diagnosis of pancreatic hamartoma. Increased late enhancement on post-contrast dynamic study and absence of diffusion restriction may be characteristic MR imaging findings of pancreatic hamartoma that may narrow the differential diagnosis of hypervascular pancreatic lesions...
June 6, 2018: Clinical Imaging
https://www.readbyqxmd.com/read/29906202/imaging-of-acute-conditions-of-the-perineum
#13
Jihee Choe, Jeremy R Wortman, Aaron D Sodickson, Bharti Khurana, Jennifer W Uyeda
A wide range of acute conditions can affect the perineum, from self-limited disease to conditions that are potentially life threatening or contribute to substantial patient morbidity if not promptly diagnosed and appropriately treated. Imaging is essential in the clinical management of perineal disease because it allows accurate anatomic localization of the origin and extent of the disease to be determined. Familiarity with complex perineal anatomy, appropriate use of imaging modalities, and the spectrum of imaging findings seen in acute perineal conditions is crucial for radiologists to make a rapid and accurate diagnosis...
June 15, 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29903924/detection-and-characteristics-of-temporal-encephaloceles-in-patients-with-refractory-epilepsy
#14
Z M Campbell, J M Hyer, S Lauzon, L Bonilha, M V Spampinato, M Yazdani
BACKGROUND AND PURPOSE: Temporal encephaloceles are increasingly visualized during neuroimaging assessment of individuals with refractory temporal lobe epilepsy, and their identification could indicate an intracranial abnormality that may be related to a potential seizure focus. Careful review by an experienced neuroradiologist may yield improved detection of TEs, and other clinical, neurophysiologic, and radiologic findings may predict their presence. MATERIALS AND METHODS: Data were reviewed retrospectively in patients at our institution who were presented at a multidisciplinary conference for refractory epilepsy between January 1, 2010, and December 31, 2016...
June 14, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29903923/mr-imaging-features-of-anaplastic-pleomorphic-xanthoastrocytoma-mimicking-high-grade-astrocytoma
#15
D She, J Liu, Z Xing, Y Zhang, D Cao, Z Zhang
BACKGROUND AND PURPOSE: Anaplastic pleomorphic xanthoastrocytoma, which has been recently defined as a distinct entity in the 2016 World Health Organization classification, may exhibit aggressive clinical behavior and relatively worse prognosis than pleomorphic xanthoastrocytoma. This study aimed to investigate whether there were any differences in MR imaging characteristics between these 2 tumors. MATERIALS AND METHODS: This retrospective study included 9 patients with anaplastic pleomorphic xanthoastrocytoma and 10 patients with pleomorphic xanthoastrocytoma who underwent MR imaging before an operation...
June 14, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29902265/clinical-use-of-submaximal-treadmill-exercise-testing-and-assessments-of-cardiac-biomarkers-nt-probnp-and-ctni-in-dogs-with-presymptomatic-mitral-regurgitation
#16
Leona Wall, Annika Mohr, Florenza Lüder Ripoli, Nayeli Schulze, Camila Duarte Penter, StephanOscar Hungerbuehler, Jan-Peter Bach, Karin Lucas, Ingo Nolte
Exercise intolerance is the first symptom of heart disease. Yet an objective and standardised method in canine cardiology to assess exercise capacity in a clinical setting is lacking. In contrast, exercise testing is a powerful diagnostic tool in humans, providing valuable information on prognosis and impact of therapeutic intervention. To investigate whether an exercise test reveals differences between dogs with early stage mitral regurgitation (MR) and dogs without cardiac disease, 12 healthy beagles (healthy group, HG) and 12 dogs with presymptomatic MR (CHIEF B1 / B2, patient group, PG) underwent a six-stage submaximal exercise test (ET) on a motorised treadmill...
2018: PloS One
https://www.readbyqxmd.com/read/29900085/target-volume-delineation-using-diffusion-weighted-imaging-for-mr-guided-radiotherapy-a-case-series-of-laryngeal-cancer-validated-by-pathology
#17
Hans Ligtenberg, Tim Schakel, Jan Willem Dankbaar, Lilian N Ruiter, Boris Peltenburg, Stefan M Willems, Nicolien Kasperts, Chris H J Terhaard, Cornelis P J Raaijmakers, Marielle E P Philippens
In radiotherapy treatment planning, tumor delineation based on diffusion-weighted imaging (DWI) by magnetic resonance imaging (MRI) is a promising technique. MR-only-based target definition becomes important with the recent development of MRI integrated radiotherapy treatment modalities. In this case series, DWI-based gross tumor volume (GTV) was validated using pathology and compared with a clinical GTV based on computed tomography (CT) imaging and MRI. This case series includes three patients with a laryngeal tumor...
April 11, 2018: Curēus
https://www.readbyqxmd.com/read/29897641/magnetic-resonance-cold-pressor-test-to-investigate-potential-endothelial-dysfunction-in-patients-suffering-from-type-1-diabetes
#18
Andreas M Weng, Stefan Wilimsky, Gwendolyn Bender, Stefanie Hahner, Herbert Köstler, Christian O Ritter
BACKGROUND: In its course, diabetes impairs microvascular function through endothelial dysfunction. As the response of myocardial perfusion to sympathetic stimulation through cold is modulated by endothelium-related factors, an incipient endothelial dysfunction might be observed noninvasively by investigation of myocardial perfusion with a cold pressor test (CPT). This approach has been used in clinical MRI previously. PURPOSE: To assess endothelial function of patients suffering from type 1 diabetes by MR CPT...
June 13, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29896148/wm-in-adolescence-what-is-the-relationship-with-emotional-regulation-and-behavioral-outcomes
#19
Chiara Malagoli, Maria Carmen Usai
Adolescence is a fundamental transition phase, marked by physical, social, cognitive and emotional changes. At this stage in development two contrasting phenomena take place: brain changes cause a sensitivity to emotional aspects (Dahl, 2004); while also control processes register as well impressive improvements (e.g., Hooper et al., 2004; Best and Miller, 2010). The study is aimed to investigate the relationship between a core cognitive feature such as working memory (WM) (Diamond, 2013) and complex abilities such as emotion regulation (ER) and behavioral self-reported outcomes using a structural equation model approach...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29893989/neurovascular-stent-artifacts-in-3d-tof-and-3d-pcmri-influence-of-stent-design-on-flow-measurement
#20
Pierre Bouillot, Olivier Brina, Bénédicte M A Delattre, Rafik Ouared, Alain Pellaton, Hasan Yilmaz, Paolo Machi, Karl-Olof Lovblad, Mohamed Farhat, Vitor Mendes Pereira, Maria Isabel Vargas
PURPOSE: The morphological and hemodynamic evaluations of neurovascular diseases treated with stents would benefit from noninvasive imaging techniques such as 3D time-of-flight MRI (3D-TOF) and 3D phase contrast MRI (3D-PCMRI). For this purpose, a comprehensive evaluation of the stent artifacts and their impact on the flow measurement is critical. METHODS: The artifacts of a representative sample of neurovascular stents were evaluated in vitro with 3D-TOF and 3D-PCMRI sequences...
June 12, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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