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https://www.readbyqxmd.com/read/29650780/differentiating-atypical-hemangiomas-and-metastatic-vertebral-lesions-the-role-of-t1-weighted-dynamic-contrast-enhanced-mri
#1
K A Morales, J Arevalo-Perez, K K Peck, A I Holodny, E Lis, S Karimi
BACKGROUND AND PURPOSE: Vertebral hemangiomas are benign vascular lesions that are almost always incidentally found in the spine. Their classic typical hyperintense appearance on T1- and T2-weighted MR images is diagnostic. Unfortunately, not all hemangiomas have the typical appearance, and they can mimic metastases on routine MR imaging. These are generally referred to as atypical hemangiomas and can result in misdiagnosis and ultimately additional imaging, biopsy, and unnecessary costs...
April 12, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29650766/association-of-genetic-instrumental-variables-for-lung-function-on-coronary-artery-disease-risk-a-2-sample-mendelian-randomization-study
#2
Shiu Lun Au Yeung, Maria-Carolina Borges, Debbie A Lawlor
BACKGROUND: Lung function, assessed by forced expiratory volume in 1 second (FEV1 ) and forced vital capacity (FVC), is inversely associated with coronary artery disease (CAD), but these associations could be because of confounding or reversed causality. We conducted a 2-sample Mendelian randomization study, using publicly available data from relevant genome-wide association studies, to examine the role of FEV1 or FVC on CAD. METHODS: We used the most recent genome-wide association studies on lung function to extract genetic instruments related to FEV1 and FVC (n=92 749)...
April 2018: Circulation. Genomic and precision medicine
https://www.readbyqxmd.com/read/29644896/pai-1-is-a-novel-component-of-the-mir-17-92-signaling-that-regulates-pulmonary-artery-smooth-muscle-cell-phenotypes
#3
Tianji Chen, Jason B Huang, Jingbo Dai, Qiyuan Zhou, J Usha Raj, Guofei Zhou
We have previously reported that miR-17~92 is critically involved in the pathogenesis of pulmonary hypertension (PH). We also identified two novel mR-17/20a direct targets PDLIM5 and PHD2 and elucidated the signaling pathways by which PDLIM5 and PHD2 regulate functions of pulmonary artery smooth muscle cells (PASMC). In addition, we have shown that plasminogen activator inhibitor-1 (PAI-1) is also downregulated in PASMC that overexpress miR-17~92. However, it is unclear whether PAI-1 is a direct target of miR-17~92 and whether it plays a role in regulating PASMC phenotype...
April 12, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29622078/update-of-mr-imaging-for-evaluation-of-lung-cancer
#4
REVIEW
Mario Ciliberto, Yuji Kishida, Shinichiro Seki, Takeshi Yoshikawa, Yoshiharu Ohno
Since MR imaging was introduced for the assessment of thoracic and lung diseases, various limitations have hindered its widespread adoption in clinical practice. Since 2000, various techniques have been developed that have demonstrated the usefulness of MR imaging for lung cancer evaluation, and it is now reimbursed by health insurance companies in many countries. This article reviews recent advances in lung MR imaging, focusing on its use for lung cancer evaluation, especially with regard to pulmonary nodule detection, pulmonary nodule and mass assessment, lung cancer staging and detection of recurrence, postoperative lung function prediction, and therapeutic response evaluation and prediction...
May 2018: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/29613961/mr-imaging-of-thymic-epithelial-neoplasms
#5
Brett W Carter, John P Lichtenberger, Marcelo F Benveniste
Thymic epithelial neoplasms are malignant lesions that originate from the thymus and include thymoma, thymic carcinoma, and thymic neuroendocrine tumors. Although computed tomography (CT) is typically considered the imaging modality of choice for identifying thymic tumors, characterizing the primary neoplasm, and staging of disease, the role of magnetic resonance (MR) imaging continues to expand. MR imaging is effective in distinguishing thymic epithelial neoplasms and other malignant tumors from benign lesions in the prevascular mediastinum, can be used to characterize and stage thymic tumors in those patients with contraindications to contrast-enhanced CT, and can reveal morphologic features of thymic tumors...
April 2018: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/29607606/detection-of-chronic-lung-allograft-dysfunction-using-ventilation-weighted-fourier-decomposition-mri
#6
A Voskrebenzev, M Greer, M Gutberlet, C Schönfeld, J Renne, J Hinrichs, T Kaireit, T Welte, F Wacker, J Gottlieb, J Vogel-Claussen
Chronic lung allograft dysfunction (CLAD) remains the leading cause of morbidity and mortality after lung transplantation. Diagnosis requires spirometric change, that becomes increasingly difficult with advancing CLAD. Fourier decomposition MRI (FD-MRI) permits acquisition of ventilated-weighted images during free-breathing. This study evaluates FD-MRI in detecting CLAD in selected patients after bilateral lung transplantation (DLTx). DLTx recipients demonstrating CLAD at various stages participated. Radiologists remained blinded to clinical status until completion of image analysis...
April 1, 2018: American Journal of Transplantation
https://www.readbyqxmd.com/read/29597193/zika-virus-pathogenesis-in-infant-mice-after-natural-transmission-by-the-bite-of-infected-mosquitoes
#7
Pragya D Yadav, Vimal Kumar, Sandeep Kumar, Chandrashekhar S Mote, Triparna D Majumdar, Mangesh Gokhale, Pravin Kore, Devendra T Mourya
OBJECTIVES: The objective of this study was to understand natural disease progression in infant CD1 mice after the bite of Aedes aegypti mosquitoes infected by the Zika virus (ZIKV, MR-766 strain). METHODS: A. aegypti mosquitoes were experimentally infected with ZIKV MR-766 strain via the oral feeding route. Infected mosquitoes were allowed to feed on infant CD1 mice. Sick mice were euthanized, and their organs were collected and subjected to real-time RT-PCR, histo-pathology, and immunohistochemistry...
March 29, 2018: Intervirology
https://www.readbyqxmd.com/read/29580790/recognition-of-neonatal-lymphatic-flow-disorder-fetal-mr-findings-and-postnatal-mr-lymphangiogram-correlation
#8
David M Biko, Jordan A Johnstone, Yoav Dori, Teresa Victoria, Edward R Oliver, Maxim Itkin
RATIONALE AND OBJECTIVES: This study aimed to describe prenatal and postnatal imaging features and outcomes of neonates with neonatal lymphatic disorders (NLDs). MATERIALS AND METHODS: An institutional review board-approved search of the radiology database for patients with NLD identified five patients. Inclusion criteria include prenatal imaging (fetal magnetic resonance [MR] imaging and ultrasound) and postnatal three-dimensional T2 Sampling Perfection with Application optimized Contrasts using different flip angle Evolution (SPACE) and dynamic contrast-enhanced MR lymphangiography within 6 months of life...
March 23, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29573050/mri-for-solitary-pulmonary-nodule-and-mass-assessment-current-state-of-the-art
#9
Yoshiharu Ohno, Hans-Ulrich Kauczor, Hiroto Hatabu, Joon Beom Seo, Edwin J R van Beek
Since the clinical introduction of magnetic resonance imaging (MRI), the chest has been one of its most challenging applications, and many physicists and radiologists have tried since the 1980s to use MR for assessment of different lung diseases as well as mediastinal and pleural diseases. Since then, however, technical advances in sequencing, scanners, and coils, adaptation of parallel imaging techniques, utilization of contrast media, and development of postprocessing tools have been reported by many basic and clinical researchers...
March 23, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29569463/gradient-echo-based-3d-sub-millisecond-echo-time-pulmonary-mr-imaging-a-preliminary-usability-study-on-clinical-and-preclinical-mr-scanners
#10
Soon Ho Yoon, Chanhee Lee, Jinil Park, Jin Mo Goo, Jang-Yeon Park
OBJECTIVE: To preliminarily investigate a technical feasibility of a sub-millisecond echo-time concurrent-dephasing-and-excitation (CODE) sequence for pulmonary MR imaging on clinical and preclinical MR scanners Methods: CODE imaging (echo time, 0.14~0.18ms) was performed with ACR phantom at 3T, seven healthy volunteers at 1.5T and 3T, ten rabbits at 3T, and two rodents at 9.4T. Signal-to-noise ratio (SNR) was compared in phantom. Image quality of human MRI was visually assessed on a five-point scale for comparison between CODE and conventional lung MRI sequences...
March 23, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29567871/-metastatic-brain-tumor-from-lung-adenocarcinoma-presenting-a-unique-radiographic-pattern-during-afatinib-treatment-a-case-report
#11
Junichi Miyamoto, Toru Nakagawa, Hiroshi Hirayama
Epidermal growth factor receptor-tyrosine kinase inhibitors(EGFR-TKIs)are used as first-line treatment for patients with EGFR-mutated non-small cell lung cancer(NSCLC). Afatinib, a second-generation EGFR-TKI, is also effective against central nervous system(CNS)metastasis of NSCLC. However, patients treated with EGFR-TKI for many months may be at an increased risk of CNS metastasis due to the development of resistance in tumor cells to EGFR-TKI. The average period for development of resistance to EGFR-TKI is 8 to 10 months after the initiation of treatment...
March 2018: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/29550261/anatomical-associations-and-radiological-characteristics-of-scimitar-syndrome-on-ct-and-mr
#12
Abdulrahman Masrani, Sebastian McWilliams, Sanjeev Bhalla, Pamela K Woodard
PURPOSE: To report the anatomical associations and radiological characteristics of Scimitar syndrome on CT and MR. MATERIALS AND METHODS: Retrospective review of the medical records between February 2001 and February 2016 was performed. To identify patients, radiological reports were queried for "Scimitar" or "partial anomalous pulmonary venous return." Patients with radiological findings of Scimitar syndrome were included. Patients without cross-sectional imaging were excluded...
February 3, 2018: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/29549792/considering-low-rank-sparse-and-gas-inflow-effects-constraints-for-accelerated-pulmonary-dynamic-hyperpolarized-129-xe-mri
#13
Sa Xiao, He Deng, Caohui Duan, Junshuai Xie, Huiting Zhang, Xianping Sun, Chaohui Ye, Xin Zhou
Dynamic hyperpolarized (HP)129 Xe MRI is able to visualize the process of lung ventilation, which potentially provides unique information about lung physiology and pathophysiology. However, the longitudinal magnetization of HP129 Xe is nonrenewable, making it difficult to achieve high image quality while maintaining high temporal-spatial resolution in the pulmonary dynamic MRI. In this paper, we propose a new accelerated dynamic HP129 Xe MRI scheme incorporating the low-rank, sparse and gas-inflow effects (L + S + G) constraints...
March 8, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29535901/mri-vessel-wall-imaging-and-treatment-of-an-aneurysm-at-the-atlanto-axial-segment-of-an-aberrant-vertebral-artery
#14
Tsang Chun On Anderson, Yeung Wan Lung Ryo, Mak Ka Fung, Lui Wai Man
We report a case of unique location of an aneurysm at the atlanto-axial extradural segment of a unilateral aberrant vertebral artery. The MRI vessel wall imaging findings and possible mechanism of aneurysm formation were discussed. A 5 mm extracranial vertebral artery aneurysm located at the interlaminar space between C1 and C2 was diagnosed in a woman presenting with occipital headache. The index vertebral artery ran an aberrant course at the V3 segment, where it entered the dura between C1 and C2 instead of the usual atlanto-occipital space...
March 2018: Neurointervention
https://www.readbyqxmd.com/read/29526883/ethyl-pyruvate-improves-pulmonary-function-in-mice-with-bleomycin-induced-lung-injury-as-monitored-with-hyperpolarized-129-xe-mr-imaging
#15
Shota Hodono, Akihiro Shimokawa, Neil J Stewart, Yukiko Yamauchi, Renya Nishimori, Mami Yamane, Hirohiko Imai, Hideaki Fujiwara, Atsuomi Kimura
PURPOSE: High Mobility Group Box1 (HMGB1), which is one of the damage-associated molecular pattern molecules relating to various inflammatory diseases, has gained interest as a therapeutic target because of its involvement in wound healing processes. In the present study, we investigated HMGB1 as a potential therapeutic target in a model of lung fibrosis using a preclinical hyperpolarized129 Xe (HPXe) MRI system. METHODS: Lung injury was induced by intra-peritoneal injection of bleomycin (BLM) in 19 mice...
March 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29524235/comparison-of-mems-switches-and-pin-diodes-for-switched-dual-tuned-rf-coils
#16
Adam Maunder, Madhwesha Rao, Fraser Robb, Jim M Wild
PURPOSE: To evaluate the performance of micro-electromechanical systems (MEMS) switches against PIN diodes for switching a dual-tuned RF coil between19 F and1 H resonant frequencies for multi-nuclear lung imaging. METHODS: A four-element fixed-phase and amplitude transmit-receive RF coil was constructed to provide homogeneous excitation across the lungs, and to serve as a test system for various switching methods. The MR imaging and RF performance of the coil when switched between the19 F and1 H frequencies using MEMS switches, PIN diodes and hardwired configurations were compared...
March 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29504181/comparison-of-3-he-and-129-xe-mri-for-evaluation-of-lung-microstructure-and-ventilation-at-1-5t
#17
Neil J Stewart, Ho-Fung Chan, Paul J C Hughes, Felix C Horn, Graham Norquay, Madhwesha Rao, Denise P Yates, Rob H Ireland, Matthew Q Hatton, Bilal A Tahir, Paul Ford, Andrew J Swift, Rod Lawson, Helen Marshall, Guilhem J Collier, Jim M Wild
BACKGROUND: To support translational lung MRI research with hyperpolarized129 Xe gas, comprehensive evaluation of derived quantitative lung function measures against established measures from3 He MRI is required. Few comparative studies have been performed to date, only at 3T, and multisession repeatability of129 Xe functional metrics have not been reported. PURPOSE/HYPOTHESIS: To compare hyperpolarized129 Xe and3 He MRI-derived quantitative metrics of lung ventilation and microstructure, and their repeatability, at 1...
March 5, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29502310/clinical-utility-of-simultaneous-whole-body-18-f-fdg-pet-mri-as-a-single-step-imaging-modality-in-the-staging-of-primary-nasopharyngeal-carcinoma
#18
Sheng-Chieh Chan, Chih-Hua Yeh, Tzu-Chen Yen, Shu-Hang Ng, Joseph Tung-Chieh Chang, Chien-Yu Lin, Tsang Yen-Ming, Kang-Hsing Fan, Bing-Shen Huang, Cheng-Lung Hsu, Kai-Ping Chang, Hung-Ming Wang, Chun-Ta Liao
PURPOSE: Both head and neck magnetic resonance imaging (MRI) and 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/computed tomography (CT) play a crucial role in the staging of primary nasopharyngeal carcinoma (NPC). In this study, we sought to prospectively investigate the clinical utility of simultaneous whole-body 18F-FDG PET/MRI for primary staging of NPC patients. METHODS: We examined 113 patients with histologically confirmed NPC who underwent pretreatment, simultaneous whole-body PET/MRI and PET/CT for primary tumor staging...
March 3, 2018: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29475034/stable-state-mr-proadrenomedullin-is-associated-with-severe-exacerbations-in-copd
#19
Emanuel Citgez, Maaike Zuur-Telgen, Job van der Palen, Paul van der Valk, Daiana Stolz, Marjolein Brusse-Keizer
BACKGROUND: Elevated levels of Midrange-proadrenomedullin (MR-proADM) is associated with worse outcome in different diseases among which COPD. The association of stable state MR-proADM with severe exacerbations of COPD requiring hospitalisation (severe AECOPD), or with community acquired pneumonia (CAP) in COPD patients has not been studied yet. AIMS AND OBJECTIVES: The aim of this study was to evaluate the association of stable state MR-proADM with severe AECOPD and CAP in COPD patients...
February 20, 2018: Chest
https://www.readbyqxmd.com/read/29470939/free-breathing-pulmonary-mr-imaging-to-quantify-regional-ventilation
#20
Dante P I Capaldi, Rachel L Eddy, Sarah Svenningsen, Fumin Guo, John S H Baxter, A Jonathan McLeod, Parameswaran Nair, David G McCormack, Grace Parraga
Purpose To measure regional specific ventilation with free-breathing hydrogen 1 (1 H) magnetic resonance (MR) imaging without exogenous contrast material and to investigate correlations with hyperpolarized helium 3 (3 He) MR imaging and pulmonary function test measurements in healthy volunteers and patients with asthma. Materials and Methods Subjects underwent free-breathing1 H and static breath-hold hyperpolarized3 He MR imaging as well as spirometry and plethysmography; participants were consecutively recruited between January and June 2017...
February 22, 2018: Radiology
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