scholarly journals The Left Superior Longitudinal Fasciculus within the Primary Sensory Area of Inferior Parietal Lobe Plays a Role in Dysgraphia of Kana Omission within Sentences

2012 ◽  
Vol 25 (4) ◽  
pp. 363-368 ◽  
Author(s):  
Nobusada Shinoura ◽  
Akira Midorikawa ◽  
Toshiyuki Onodera ◽  
Ryozi Yamada ◽  
Yusuke Tabei ◽  
...  
Keyword(s):  
Brain Tumor ◽  
Parietal Lobe ◽  
Diffusion Tensor ◽  
Superior Longitudinal Fasciculus ◽  
Inferior Parietal Lobe ◽  
Sensory Area ◽  
Anatomical Localization ◽  
Dti Tractography ◽  
The Brain ◽  
Diffusion Tensor Imaging Dti

Functional neurological changes after surgery combined with diffusion tensor imaging (DTI) tractography can directly provide evidence of anatomical localization of brain function. Using these techniques, a patient with dysgraphia before surgery was analyzed at our hospital in 2011. The patient showed omission of kana within sentences before surgery, which improved after surgery. The brain tumor was relatively small and was located within the primary sensory area (S1) of the inferior parietal lobe (IPL). DTI tractography before surgery revealed compression of the branch of the superior longitudinal fasciculus (SLF) by the brain tumor. These results suggest that the left SLF within the S1 of IPL plays a role in the development of dysgraphia of kana omission within sentences.

Microsurgical Anatomy of the Vertical Rami of the Superior Longitudinal Fasciculus: An Intraparietal Sulcus Dissection Study

2018 ◽  
Vol 16 (2) ◽  
pp. 226-238 ◽  
Author(s):  
Alejandro Monroy-Sosa ◽  
Jonathan Jennings ◽  
Srikant Chakravarthi ◽  
Melanie B Fukui ◽  
Juanita Celix ◽  
...  
Keyword(s):  
Parietal Lobe ◽  
Diffusion Tensor ◽  
Dorsal Stream ◽  
Microsurgical Anatomy ◽  
Superior Longitudinal Fasciculus ◽  
Human Connectome Project ◽  
Lateral Extent ◽  
Dti Tractography ◽  
Tractography Data ◽  
Diffusion Tensor Imaging Dti

Abstract BACKGROUND A number of vertical prolongations of the superior longitudinal fasciculus, which we refer to as the vertical rami (Vr), arise at the level of the supramarginal gyrus, directed vertically toward the parietal lobe. OBJECTIVE To provide the first published complete description of the white matter tracts (WMT) of the Vr, their relationship to the intraparietal and parieto-occipital sulci (IPS-POS complex), and their importance in neurosurgical approaches to the parietal lobe. METHODS Subcortical dissections of the Vr and WMT of the IPS were performed. Findings were correlated with a virtual dissection using high-resolution diffusion tensor imaging (DTI) tractography data derived from the Human Connectome Project. Example planning of a transparietal, transsulcal operative corridor is demonstrated using an integrated neuronavigation and optical platform. RESULTS The Vr were shown to contain component fibers of the superior longitudinal fasciculus (SLF)-II and SLF-III, with contributions from the middle longitudinal fasciculus merging into the medial bank of the IPS. The anatomic findings correlated well with DTI tractography. The line extending from the lateral extent of the POS to the IPS marks an ideal sulcal entry point that we have termed the IPS-POS Kassam-Monroy (KM) Point, which can be used to permit a safe parafascicular surgical trajectory to the trigone. CONCLUSION The Vr are a newly conceptualized group of tracts merging along the banks of the IPS, mediating connectivity between the parietal lobe and dorsal stream/SLF. We suggest a refined surgical trajectory to the ventricular atrium utilizing the posterior third of the IPS, at or posterior to the IPS-POS Point, in order to mitigate risk to the Vr and its considerable potential for postsurgical morbidity.

Brain Structure Alterations in Hemifacial Spasm: A Diffusion Tensor Imaging Study

2020 ◽  
pp. 155005942097925
Author(s):  
Jian Zhang ◽  
Qingyang Yu ◽  
Peng Gu ◽  
Hongtao Sun ◽  
Fei Yuan ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Hemifacial Spasm ◽  
Diffusion Tensor ◽  
Imaging Study ◽  
Poor Sleep ◽  
Poor Sleep Quality ◽  
Superior Longitudinal Fasciculus ◽  
Activity Dependent ◽  
Diffusion Tensor Imaging Study ◽  
Diffusion Tensor Imaging Dti

This study examined white matter integrity in patients with left-sided hemifacial spasm (HFS) using diffusion tensor imaging (DTI). Thirty-six patients with left-sided HFS (mean age 53.24 ± 8.16 years) and 36 healthy volunteers (mean age 53.92 ± 7.73 years) were recruited. Tract-based spatial statistics (TBSS) analysis revealed significantly increased fractional anisotropy (FA) of bilateral superior longitudinal fasciculus in HFS patients ( P < 0.05, family-wise error corrected), with trends for radial diffusivity to decrease. We inferred that the results may be associated with poor sleep quality, impairment in visuospatial construction, and activity-dependent increases in myelination in HFS patients. Furthermore, the FA value of left superior longitudinal fasciculus showed a positive correlation with HFS duration ( r = 0.352, P = .041) and spasm severity ( r = 0.416, P = .014). However, the alteration of medial diffusivity and axial diffusivity were not found in bilateral superior longitudinal fasciculus between groups. These findings suggest FA changes of superior longitudinal fasciculus reflected by TBSS analysis may provide valuable insights into the diagnosis of HFS.

scholarly journals Magnetic resonance diffusion tensor imaging in psychiatry: a narrative review of its potential role in diagnosis

2020 ◽  
Author(s):  
Piotr Podwalski ◽  
Krzysztof Szczygieł ◽  
Ernest Tyburski ◽  
Leszek Sagan ◽  
Błażej Misiak ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
White Matter ◽  
Magnetic Resonance ◽  
Potential Role ◽  
Diffusion Tensor ◽  
Mean Diffusivity ◽  
Water Molecules ◽  
Mental Diseases ◽  
The Brain ◽  
Diffusion Tensor Imaging Dti

Abstract Diffusion tensor imaging (DTI) is an imaging technique that uses magnetic resonance. It measures the diffusion of water molecules in tissues, which can occur either without restriction (i.e., in an isotropic manner) or limited by some obstacles, such as cell membranes (i.e., in an anisotropic manner). Diffusion is most often measured in terms of, inter alia, fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (AD). DTI allows us to reconstruct, visualize, and evaluate certain qualities of white matter. To date, many studies have sought to associate various changes in the distribution of diffusion within the brain with mental diseases and disorders. A better understanding of white matter integrity disorders can help us recognize the causes of diseases, as well as help create objective methods of psychiatric diagnosis, identify biomarkers of mental illness, and improve pharmacotherapy. The aim of this work is to present the characteristics of DTI as well as current research on its use in schizophrenia, affective disorders, and other mental disorders.

White matter microstructural abnormalities in families multiply affected with bipolar I disorder: a diffusion tensor tractography study

2013 ◽  
Vol 44 (10) ◽  
pp. 2139-2150 ◽  
Author(s):  
L. Emsell ◽  
C. Chaddock ◽  
N. Forde ◽  
W. Van Hecke ◽  
G. J. Barker ◽  
...  
Keyword(s):  
White Matter ◽  
Diffusion Tensor ◽  
Internal Capsule ◽  
Type I ◽  
Genetic Liability ◽  
Inferior Longitudinal Fasciculus ◽  
Participant Group ◽  
Dti Tractography ◽  
Magnetic Resonance Imaging Mri ◽  
Diffusion Tensor Imaging Dti

BackgroundWhite matter (WM) abnormalities are proposed as potential endophenotypic markers of bipolar disorder (BD). In a diffusion tensor imaging (DTI) voxel-based analysis (VBA) study of families multiply affected with BD, we previously reported that widespread abnormalities of fractional anisotropy (FA) are associated with both BD and genetic liability for illness. In the present study, we further investigated the endophenotypic potential of WM abnormalities by applying DTI tractography to specifically investigate tracts implicated in the pathophysiology of BD.MethodDiffusion magnetic resonance imaging (MRI) data were acquired from 19 patients with BD type I from multiply affected families, 21 of their unaffected first-degree relatives and 18 healthy volunteers. DTI tractography was used to identify the cingulum, uncinate fasciculus (UF), arcuate portion of the superior longitudinal fasciculus (SLF), inferior longitudinal fasciculus (ILF), corpus callosum, and the anterior limb of the internal capsule (ALIC). Regression analyses were conducted to investigate the effect of participant group and genetic liability on FA and radial diffusivity (RD) in each tract.ResultsWe detected a significant effect of group on both FA and RD in the cingulum, SLF, callosal splenium and ILF driven by reduced FA and increased RD in patients compared to controls and relatives. Increasing genetic liability was associated with decreased FA and increased RD in the UF, and decreased FA in the SLF, among patients.ConclusionsWM microstructural abnormalities in limbic, temporal and callosal pathways represent microstructural abnormalities associated with BD whereas alterations in the SLF and UF may represent potential markers of endophenotypic risk.

Reliability and variability of diffusion tensor imaging (DTI) tractography in pediatric epilepsy

2014 ◽  
Vol 37 ◽  
pp. 116-122 ◽  
Author(s):  
Helen L. Carlson ◽  
Christianne Laliberté ◽  
Brian L. Brooks ◽  
Jacquie Hodge ◽  
Adam Kirton ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Pediatric Epilepsy ◽  
Dti Tractography ◽  
Diffusion Tensor Imaging Dti

Damage to the Upper Portion of Area 19 and the Deep White Matter in the Left Inferior Parietal Lobe, Including the Superior Longitudinal Fasciculus, Results in Alexia with Agraphia

2010 ◽  
Vol 64 (4) ◽  
pp. 224-229 ◽  
Author(s):  
Nobusada Shinoura ◽  
Toshiyuki Onodera ◽  
Kotoyo Kurokawa ◽  
Masanobu Tsukada ◽  
Ryozi Yamada ◽  
...  
Keyword(s):  
White Matter ◽  
Parietal Lobe ◽  
Superior Longitudinal Fasciculus ◽  
Deep White Matter ◽  
Inferior Parietal Lobe ◽  
Area 19

ITVT-03. Use of Functional MRI and DTI for Surgical Planning of Maximal Extent of Resection of CNS Tumors - A Single Neurosurgical Center’s Experience

2021 ◽  
Vol 23 (Supplement_6) ◽  
pp. vi228-vi228
Author(s):  
Fred Lam ◽  
Hanan Algethami ◽  
Kasper Ekkehard
Keyword(s):  
Diffusion Tensor ◽  
Functional Neuroimaging ◽  
Case Series ◽  
Extent Of Resection ◽  
Imaging Modalities ◽  
Fiber Tracts ◽  
Pet Ct ◽  
Brainstem Tumors ◽  
The Brain ◽  
Diffusion Tensor Imaging Dti

Abstract Use of functional neuroimaging capabilities such as fMRI, DTI, MRP, MRS, AS-PET-CT, SPECT, and TMS as noninvasive tools to visualize intrinsic brain and spine morphology in relation to function have developed over the past 30 years. Amongst these imaging modalities, functional magnetic resonance imaging (fMRI) is of particular interest since it follows the physiological coupling between neuronal electrical activity and metabolic structural (cellular) activity as it relates to tissue vascularity and perfusion states. As an adjunct to this modality, MRI-based diffusion tensor imaging (DTI) allows further detailed radiographic assessment of fiber tracts in the brain in relationship to the surgical lesion of interest. In addition, combination of other imaging modalities including MR perfusion and intraoperative tools such as neuronavigation and direct cortical stimulation can help guide the extent of maximal safe resection. Herein we present a case series from our neurosurgical institution of primary intra-axial, extra-axial, supratentorial, and brainstem tumors resected using fMRI and DTI for presurgical planning allowing for maximal safe extent of resection and outcomes.

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