1.Is Corticospinal Tract Degeneration Caused by Sjögren Syndrome?.
Tai Seung NAM ; Michael LEVY ; Sang Hoon KIM ; Kyung Wook KANG ; Byoung Joon KIM ; Seung Han LEE
Journal of Clinical Neurology 2018;14(2):259-260
No abstract available.
Pyramidal Tracts*
2.A Study on the Fiber Tracking Using a Vector Correlation Function in DT-MRI.
Sung Won JO ; Bong Su HAN ; In Sung PARK ; Sung Hee KIM ; Dong Youn KIM
Korean Journal of Medical Physics 2007;18(4):214-220
Diffusion tensor tractorgraphy which is based on line propagation method with brute force approach is implemented and the vector correlation function is proposed in addition to the conventional fractional anisotrophy value as a criterion to select seed points. For the whole tractography, the proposed method used 41% less seed points than the conventional brute force approach for FA > or =0.3 and most of the fiber tracks in the outer region of white matter were removed. For the corticospinal tract passing through region of interest, the proposed method has produced similar results with 50% less seed points than conventional one.
Diffusion
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Pyramidal Tracts
3.Two Cases of Central Facial Palsy due to Medullary Infarction.
Chang Yun PARK ; Kyu Yong LEE ; Seung Hyun KIM
Journal of the Korean Neurological Association 2005;23(4):531-533
According to the anatomical pathways of the corticobulbar tract, it is known that the responsible lesion site of central facial palsy is at the level of the midpons or the more rostral portion. In rare cases, central facial palsy is found in medullary lesions. We report two cases of medullary infarctions which presented as central facial palsy. These cases suggested that the hypothesis that part of the pathway of the facial corticobulbar fibers descend ipsilaterally to the lower medulla before decussating and ascending contralaterally to the facial nucleus.
Facial Paralysis*
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Infarction*
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Pyramidal Tracts
4.Spastic Paraparesis With Bilateral Corticospinal Tract High Signal Intensities in the Brain MRI.
Journal of the Korean Neurological Association 2010;28(3):247-248
No abstract available.
Brain
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Muscle Spasticity
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Paraparesis, Spastic
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Pyramidal Tracts
5.Mini-Review of Studies Reporting the Repeatability and Reproducibility of Diffusion Tensor Imaging
Jeong Pyo SEO ; Young Hyeon KWON ; Sung Ho JANG
Investigative Magnetic Resonance Imaging 2019;23(1):26-33
PURPOSE: Diffusion tensor imaging (DTI) data must be analyzed by an analyzer after data processing. Hence, the analyzed data of DTI might depend on the analyzer, making it a major limitation. This paper reviewed previous DTI studies reporting the repeatability and reproducibility of data from the corticospinal tract (CST), one of the most actively researched neural tracts on this topic. MATERIALS AND METHODS: Relevant studies published between January 1990 and December 2018 were identified by searching PubMed, Google Scholar, and MEDLINE electronic databases using the following keywords: DTI, diffusion tensor tractography, reliability, repeatability, reproducibility, and CST. As a result, 15 studies were selected. RESULTS: Measurements of the CSTs using region of interest methods on 2-dimensional DTI images generally showed excellent repeatability and reproducibility of more than 0.8 but high variability (0.29 to 1.00) between studies. In contrast, measurements of the CST using the 3-dimensional DTT method not only revealed excellent repeatability and reproducibility of more than 0.9 but also low variability (repeatability, 0.88 to 1.00; reproducibility, 0.82 to 0.99) between studies. CONCLUSION: Both 2-dimensional DTI and 3-dimensional DTT methods appeared to be reliable for measuring the CST but the 3-dimensional DTT method appeared to be more reliable.
Diffusion Tensor Imaging
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Diffusion
;
Methods
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Pyramidal Tracts
6.Clinical Usefulness of Diffusion Tensor Image Tractography in Stroke Patients: Report of two cases.
Jae Hoon KANG ; Kyung A PARK ; Dong Seok YANG ; Sung Ho JANG ; Sang Ho AHN ; Yun Woo CHO ; Dong Gyu KIM
Journal of the Korean Academy of Rehabilitation Medicine 2008;32(2):222-225
We report the clinical usefulness of elucidating the state of the corticospinal tract (CST) by the use of diffusion tensor image tractography (DTT) in hemiparetic stroke patients. DTT was performed using 1.5 T magnetic resonance imaging. DTT demonstrated that the CST of the affected hemisphere was preserved in the medial portion of the hematoma in patient 1, but was interrupted by a hematoma in patient 2. DTT seems to be useful for elucidating the status of the CST in hemiparetic stroke patients.
Diffusion
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Hematoma
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Humans
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Magnetic Resonance Imaging
;
Pyramidal Tracts
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Stroke
7.Opalski Syndrome Presenting as Sensorimotor Deficits Ipsilateral to Cerebral Infarction
Ha Kyeu AN ; Jong Wook SHIN ; Soo Young KIM ; Hee Jin CHANG ; Hye Seon JEONG
Journal of the Korean Neurological Association 2019;37(2):186-190
Opalski syndrome is a rare lateral medullary infarction variant presenting with ipsilateral motor deficits known to be caused by involvement of the post-decussating pyramidal tract. Here, we report two rare cases of Opalski syndrome presenting as ipsilateral sensorimotor deficits in cerebral infarction.
Cerebral Infarction
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Infarction
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Lateral Medullary Syndrome
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Pyramidal Tracts
8.Sepsis Associated Encephalopathy Accompanied by Bilateral Corticospinal Tract Lesions in Diffusion Weighed Image
Unkyu YUN ; Sang Won HA ; Seung Min KIM ; In Joong KIM
Journal of the Korean Neurological Association 2018;36(2):129-131
No abstract available.
Diffusion
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Leukoencephalopathies
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Pyramidal Tracts
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Sepsis
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Sepsis-Associated Encephalopathy
9.Atlanto-Axial Dislocation with Odontoid Process Fracture Associated with "Cruciate Paralysis".
Mu Yeon CHO ; Jong Ha SHIN ; Chun Sik CHOI ; Mun Bae JU
Journal of Korean Neurosurgical Society 1991;20(7):568-573
Cruciate paralysis, an unusual clinical entity, is "frequently undiagnosed or misunderstood", and can simulate the acute cervical central-cord injury syndrome. This rare injury pattern is characterized by weakness of upper extremities with little or no compromise of lower limb function following trauma to the superior cervical cord. The pattern of injury and clinical findings support selective damage to the corticospinal tract or upper motor neurons subserving upper limb function with the pyramidal decussation. Authors experience a case of curciate paralysis due to type 2 odontoid fracture and atlas dislocation.
Central Cord Syndrome
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Dislocations*
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Lower Extremity
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Motor Neurons
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Odontoid Process*
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Paralysis
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Pyramidal Tracts
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Upper Extremity
10.Motor Recovery in Stroke Patients.
Yeungnam University Journal of Medicine 2005;22(2):119-130
Stroke is a leading cause of chronic physical disability. The recent randomized controlled trials have that motor function of chronic stroke survivors could be improved through physical or pharmacologic intervention in the stroke rehabilitation setting. In addition, several functional neuroimaging techniques have recently developed, it is available to study the functional topography of sensorimotor area of the brain. However, the mechanisms involved in motor recovery after stroke, are still poorly understood. Four motor recovery mechanisms have been suggested, such as reorganization into areas adjacent to the injured primary motor cortex (M1), unmasking of the motor pathway from the unaffected motor cortex to the affected hand, attribution of secondary motor areas, and recovery of the damaged contralateral corticospinal tract. Understanding the motor recovery mechanisms would provide neurorehabilitation specialists with more information to allow for precise prognosis and therapeutic strategies based on the scientific evidence; this may help promote recovery of motor function. This review introduces several methodologies for neuroimaging techniques and discusses theoretical issues that impact interpretation of functional imaging studies of motor recovery after stroke. Perspectives, for future research are presented.
Brain
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Functional Neuroimaging
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Hand
;
Humans
;
Motor Cortex
;
Neuroimaging
;
Prognosis
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Pyramidal Tracts
;
Rehabilitation
;
Specialization
;
Stroke*
;
Survivors