NEUROIMAGING FOR THE DIAGNOSIS OF DEMENTIA

2021 ◽  
pp. 1088-1094
Author(s):  
Л. Р. Ахмадеева ◽  
Д. Э. Байков ◽  
Р. Р. Валитова ◽  
Е. В. Екушева ◽  
В. Б. Войтенков ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Structural Changes ◽  
Lewy Body Dementia ◽  
Laboratory Diagnosis ◽  
Diagnostic Value ◽  
Amyloid Angiopathy ◽  
Diagnosis Of Dementia ◽  
Magnetic Resonance Imaging Mri ◽  
In Vivo Diagnosis

В результате совершенствования методов лабораторной диагностики и нейровизуализации стало возможным определение ряда биомаркеров, которые позволили улучшить прижизненную диагностику наиболее распространенных вариантов деменции (болезни Альцгеймера, деменции с тельцами Леви, сосудистой деменции). Структурные изменения, которые выявляются при МРТ головного мозга, являются значимыми для прогноза изменений в когнитивной сфере. Дополнительным доступным маркером, который повышает диагностическую значимость лейкоареоза и свидетельствует в пользу гипертонической микроангиопатии или церебральной амилоидной ангиопатии, является церебральное микрокровоизлияние, особенно в случаях тяжелого когнитивного дефицита и смешанной патологии. Приводится собственное наблюдение и данные цифровой гиппокампометрии как пример эффективного использования нейровизуализационных методов в дифференциальной диагностике деменции. Development of laboratory diagnosis and neuroimaging revealed some biomarkers for in vivo diagnosis of the most common forms of dementia (Alzheimer’s disease, Lewy body dementia and vascular dementia) for their differential diagnosis. Structural changes found using magnetic resonance imaging (MRI) are significant for the prognosis of the cognitive decline. Cerebral microbleeds are an available adjuvant diagnostic marker, which increases the diagnostic value of leukoaraiosis that suggests the development of cerebral amyloid angiopathy or hypertensive microangiopathy, especially in cases of mixed causes of dementia and severe cognitive deficits. We describe our own clinical case and the results of digital voxel hippocampometry as an example of effective usage of neuroimaging for the differential diagnosis of dementia.

scholarly journals Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

2019 ◽  
Vol 22 (3) ◽  
pp. 425-431
Author(s):  
Neiandro Santos Galvão ◽  
Antonione Santos Bezerra Pinto ◽  
Alan Leandro Carvalho Farias ◽  
André Luiz Ferreira Costa ◽  
Sérgio Lúcio Pereira de Castro Lopes ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Additional Information ◽  
Imaging Characteristics ◽  
Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

scholarly journals Body mass index, time of day, and genetics affect perivascular spaces in the white matter

2020 ◽  
Author(s):  
Giuseppe Barisano ◽  
Farshid Sepehrband ◽  
Nasim Sheikh-Bahaei ◽  
Meng Law ◽  
Arthur W. Toga
Keyword(s):  
Body Mass Index ◽  
White Matter ◽  
Body Mass ◽  
Structural Changes ◽  
Large Population ◽  
Time Of Day ◽  
Perivascular Spaces ◽  
Healthy Human ◽  
Magnetic Resonance Imaging Mri

AbstractThe analysis of cerebral perivascular spaces (PVS) using magnetic resonance imaging (MRI) allows to explore in vivo their contributions to neurological disorders. To date the normal amount and distribution of PVS in healthy human brains are not known, thus hampering our ability to define with confidence pathogenic alterations. Furthermore, it is unclear which biological factors can influence the presence and size of PVS on MRI. We performed exploratory data analysis of PVS volume and distribution in a large population of healthy individuals (n = 897, age = 28.8 ± 3.7). Here we describe the global and regional amount of PVS in the white matter, which can be used as a reference for clinicians and researchers investigating PVS and may help the interpretation of the structural changes affecting PVS in pathological states. We found a relatively high inter-subject variability in the PVS amount in this population of healthy adults (range: 1.31-14.49 cm3). We then identified body mass index, time of day, and genetics as new elements significantly affecting PVS in vivo under physiological conditions, offering a valuable foundation to future studies aimed at understanding the physiology of perivascular flow.

scholarly journals Body mass index, time of day, and genetics affect perivascular spaces in the white matter

2020 ◽  
pp. 0271678X2097285
Author(s):  
Giuseppe Barisano ◽  
Nasim Sheikh-Bahaei ◽  
Meng Law ◽  
Arthur W Toga ◽  
Farshid Sepehrband
Keyword(s):  
Body Mass Index ◽  
White Matter ◽  
Body Mass ◽  
Structural Changes ◽  
Large Population ◽  
Time Of Day ◽  
Perivascular Spaces ◽  
Healthy Human ◽  
Magnetic Resonance Imaging Mri

The analysis of cerebral perivascular spaces (PVS) using magnetic resonance imaging (MRI) allows to explore in vivo their contributions to neurological disorders. To date the normal amount and distribution of PVS in healthy human brains are not known, thus hampering our ability to define with confidence pathogenic alterations. Furthermore, it is unclear which biological factors can influence the presence and size of PVS on MRI. We performed exploratory data analysis of PVS volume and distribution in a large population of healthy individuals (n = 897, age = 28.8 ± 3.7). Here we describe the global and regional amount of PVS in the white matter, which can be used as a reference for clinicians and researchers investigating PVS and may help the interpretation of the structural changes affecting PVS in pathological states. We found a relatively high inter-subject variability in the PVS amount in this population of healthy adults (range: 1.31–14.49 cm3). The PVS volume was higher in older and male individuals. Moreover, we identified body mass index, time of day, and genetics as new elements significantly affecting PVS in vivo under physiological conditions, offering a valuable foundation to future studies aimed at understanding the physiology of perivascular flow.

Structural MRI

2011 ◽  
Vol 23 (S2) ◽  
pp. S13-S24 ◽  
Author(s):  
Mike P. Wattjes
Keyword(s):  
Rating Scales ◽  
Structural Mri ◽  
Vascular Damage ◽  
Cortical Atrophy ◽  
Amyloid Angiopathy ◽  
Memory Clinic ◽  
Visual Rating ◽  
Diagnosis Of Dementia ◽  
Magnetic Resonance Imaging Mri ◽  
Diagnostic Work

ABSTRACTClinical neuroimaging is increasingly being used in the diagnosis of neurodegenerative diseases and has become one of the most important paraclinical tools in the diagnosis of dementia. According to current guidelines, neuroimaging, preferably magnetic resonance imaging (MRI), should be performed at least once during the diagnostic work-up of patients with suspected or definite dementia. MRI is helpful in identifying or excluding potentially treatable causes of dementia; however, these account only for a small proportion of dementias. In addition, MRI is able to support the clinical diagnosis in a memory clinic setting by identifying certain patterns of atrophy and vascular damage. Visual rating scales are well-established methods in the clinical routine for the assessment and quantification of regional/global cortical atrophy, hippocampal atrophy and vascular damage. In addition, MRI is able to detect certain aspects of pathology associated with dementia, such as cerebral microbleeds which are related to cerebral amyloid angiopathy and Alzheimer pathology. This review paper aims to give an overview of the application of structural MRI in the diagnostic procedure for memory clinic patients in terms of excluding and supporting the diagnosis of various diseases associated with dementia.

scholarly journals Diagnostic value of "cuticular index" measuring in dogs with liver and kidney pathology

2021 ◽  
pp. 78-84
Author(s):  
O. P. Timoshenko ◽  
◽  
O. S. Snopenko ◽  
D. V. Kibkalo ◽  
M. I. Korenev ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Structural Changes ◽  
Root Zone ◽  
Diagnostic Value ◽  
Hair Shaft ◽  
Laboratory Studies ◽  
Hair Samples ◽  
Liver And Kidney ◽  
Biochemical Research ◽  
Definition Of

Сondition of hair reflects changes in metabolism in animals and humans in relatively long period of time. Thus, the study of hair of domestic dogs with different variants of pathology, in particular nephropathy and polyorgan pathology of liver and kidney is relevant and appropriate in terms of differential diagnosis and establishment of little-known links in the pathogenesis of diseases of these organs. The aim of this study was to establish the diagnostic meaning of «cuticular index» of sick dogs. The object of the study was 60 dogs with confirmed diagnoses. The animals were examined by general clinical methods (temperature, pulse, and respiratory rate were determined) and blood was taken from the jugular vein for biochemical research. Hair samples were obtained and the «cuticular index» was determined. Examination of the cuticle was performed using prints on a colorless varnish, which was applied to a glass slide, pressing the hair to the varnish layer. Then, when the varnish hardened, the hair was removed by the edge from the peripheral end. The impression was studied under a microscope (in. x 400) and set the value of «cuticular index» in the root zone, in the thickest part of the hair shaft, expressed in μm2. Based on the results obtained during clinical and laboratory studies, we have formed groups of sick dogs, which became the basis for studying the dynamics of the «cuticular index» (CI). It was found that in different variants of nephropathy and in the development of hepatic-renal and renal-hepatic syndromes in dogs, significant structural changes occur in the liver and kidney, which correspond to violations of metabolic processes determined by the results of clinical microscopic and biochemical blood tests, as well as changes in the area of the outer surface of the cells of hair cuticle, which we have defined as the «cuticular index». The method of determining the «cuticular index» can be used in differential diagnosis of kidney and liver pathology in combination with clinical, instrumental and laboratory studies, as well as for dispensary examination of animals. The article provides examples of various variants of pathology with the definition of «cuticular index»

scholarly journals Imaging Studies in Otosclerosis: An Up-to-date Comprehensive Review

2020 ◽  
Author(s):  
Lucas Resende Lucinda Mangia ◽  
Luiz Otávio de Mattos Coelho ◽  
Bettina Carvalho ◽  
Adriana Kosma Pires de Oliveira ◽  
Rogerio Hamerschmidt
Keyword(s):  
Differential Diagnosis ◽  
Diagnostic Value ◽  
Imaging Studies ◽  
Superior Semicircular Canal Dehiscence ◽  
Acquired Hearing Loss ◽  
Potential Benefits ◽  
Surgical Failure ◽  
Magnetic Resonance Imaging Mri ◽  
Prognostic Prediction

Abstract Introduction Otosclerosis is a primary osteodystrophy of the otic capsule, frequently responsible for acquired hearing loss in adults. Although the diagnostic value of imaging investigations in otosclerosis is debatable, they might still be employed with different goals within the context of the disease. Objectives The present paper aims to review the most recent literature on the use of imaging studies in otosclerosis for the most varied purposes, from routine application and differential diagnosis to prognostic prediction and investigation of surgical failure. Data Synthesis The diagnosis of otosclerosis is usually clinical, but computed tomography (CT) is paramount in particular cases for the differential diagnosis. The routine use, however, is not supported by strong evidence. Even so, there is growing evidence of the role of this method in surgical planning and prediction of postoperative prognosis. In specific scenarios, for example when superior semicircular canal dehiscence (SSCD) syndrome is suspected or in surgical failure, CT is crucial indeed. Magnetic resonance imaging (MRI), however, has limited – although important – indications in the management of individuals with otosclerosis, especially in the evaluation of postoperative complications and in the follow-up of medical treatment in active ostosclerosis. Conclusion Imaging studies have a broad range of well-established indications in otosclerosis. Besides, although the routine use of CT remains controversial, the most recent papers have shed light into new potential benefits of imaging prior to surgery.

Added Value of QEEG for the Differential Diagnosis of Common Forms of Dementia

2020 ◽  
pp. 155005942097112
Author(s):  
Livia Livinț Popa ◽  
Hanna-Maria Dragoș ◽  
Ștefan Strilciuc ◽  
Cristina Pantelemon ◽  
Ioana Mureșanu ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Lewy Body Dementia ◽  
Quantitative Eeg ◽  
Added Value ◽  
Signal Acquisition ◽  
Imaging Features ◽  
Diagnosis Of Dementia ◽  
Quantitative Analyses ◽  
Signal Acquisition And Processing

Introduction Quantitative electroencephalography (QEEG) has been documented as a helpful tool in the differential diagnosis of Alzheimer’s disease (AD) with common forms of dementia. The main objective of the study was to assess the role of QEEG in AD differential diagnosis with other forms of dementia: Lewy body dementia (LBD), Parkinson’s disease dementia (PDD), frontotemporal dementia (FTD), and vascular dementia (VaD). Methods We searched PubMed, Embase, and PsycNET, for articles in English published in peer-reviewed journals from January 1, 1980 to April 23, 2019 using adapted search strategies containing keywords quantitative EEG and Alzheimer. The risk of bias was assessed by applying the QUADAS tool. The systematic review was conducted in line with the PRISMA methodology. Results We identified 10 articles showcasing QEEG features used in diagnosing dementia, EEG slowing phenomena in AD and PDD, coherence changes in AD and VaD, the role of LORETA in dementia, and the controversial QEEG pattern in FTD. Results vary significantly in terms of sociodemographic features of the studied population, neuropsychological assessment, signal acquisition and processing, and methods of analysis. Discussion This article provides a comparative synthesis of existing evidence on the role of QEEG in diagnosing dementia, highlighting some specific features for different types of dementia (eg, the slow-wave activity has been remarked in both AD and PDD, but more pronounced in PDD patients, a diminution in anterior and posterior alpha coherence was noticed in AD, and a lower alpha coherence in the left temporal-parietal-occipital regions was observed in VaD). Conclusion QEEG may be a useful investigation for settling the diagnosis of common forms of dementia. Further research of quantitative analyses is warranted, particularly on the association between QEEG, neuropsychological, and imaging features. In conjunction, these methods may provide superior diagnostic accuracy in the diagnosis of dementia.

scholarly journals Morphometry MRI in the differential diagnosis of parkinsonian syndromes

2010 ◽  
Vol 68 (3) ◽  
pp. 333-338 ◽  
Author(s):  
Rômulo L Gama ◽  
Daniel F.G Távora ◽  
Rodrigo C Bomfim ◽  
Cruiff E Silva ◽  
Veralice M. de Bruin ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Diagnostic Value ◽  
Superior Cerebellar Peduncle ◽  
Good Sensitivity ◽  
Resonance Imaging ◽  
Middle Cerebellar Peduncle ◽  
Parkinsonian Syndromes ◽  
Cerebellar Peduncle ◽  
Magnetic Resonance Imaging Mri ◽  
Sensitivity Specificity

This study evaluates the diagnostic value of morphometric magnetic resonance imaging (MRI) in the differential diagnosis among Parkinson's disease (PD), progressive supranuclear palsy (PSP) and multiple system atrophy (MSA). We studied 21 PD cases, 11 MSA-c, 8 MSA-p and 20 PSP cases. Midbrain area (Ams), pons area (Apn), middle cerebellar peduncle (MCP) and superior cerebellar peduncle (SCP) were measured using MRI. Comparisons were made between PD, MSA-p, MSA-c and PSP. Apn, MCP and SCP morphometry dimensions presented differences among groups. Ams below 105 mm² and SCP smaller than 3 mmwere the most predictive measures of PSP (sensitivity 95.0 and 80.0%, respectively). For the group of MSA-c patients, Apn area below 315 mm² showed good specificity and positive predictive value (93.8% and 72.7%, respectively). In conclusion, dimensions and cut off values obtained from routine MRI can differentiate between PD, PSP and MSA-c with good sensitivity, specificity and accuracy.

MRI for in vivo diagnosis of cerebral amyloid angiopathy: Tailoring artifacts to image hemorrhagic biomarkers

2017 ◽  
Vol 173 (9) ◽  
pp. 554-561
Author(s):  
G. Boulouis ◽  
M. Edjlali-Goujon ◽  
S. Moulin ◽  
W. Ben Hassen ◽  
O. Naggara ◽  
...  
Keyword(s):  
Cerebral Amyloid Angiopathy ◽  
Amyloid Angiopathy ◽  
Cerebral Amyloid ◽  
In Vivo Diagnosis
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