Dong Seok Yang

Ulsan University Hospital, Urusan, Ulsan, South Korea

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Publications (6)17.93 Total impact

  • Dong Seok Yang · Hyeok Gyu Kwon · Sung Ho Jang
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    ABSTRACT: The thalamocingulate tract between the anterior thalamic nuclei and the cingulate gyrus is a part of the Papez circuit. Using diffusion tensor tractography, injury of the thalamocingulate tract was investigated in patients with mild traumatic brain injury. Two patients (patient 1: a 58-yr-old woman and patient 2: a 49-yr-old man) with head trauma resulting from a car accident were enrolled. They were classified as mild traumatic brain injury and no specific lesion was observed on brain magnetic resonance imaging. These patients complained of memory impairment after head trauma. The entire Papez circuits, including thalamocingulate tract, fornix, mammillothalamic tract, and cingulum, were reconstructed in both hemispheres except for the left thalamocingulate tract: patient 1, it was thinner and discontinued compared with the right thalamocingulate tract; and patient 2, it was not reconstructed. The injury of the left thalamocingulate tract appeared to be related to the memory impairment in these patients.
    No preview · Article · Nov 2015 · American journal of physical medicine & rehabilitation / Association of Academic Physiatrists
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    ABSTRACT: The anatomical location and somatotopic organization of the corticospinal tract (CST) in the corona radiata (CR) of the normal human brain have not been studied using diffusion tensor tractography so far. In this study, the anatomical location and somatotopic organization of the CST in the CR were evaluated by determining the highest probabilistic locations and distances between the upper and lower extremities in the slices of upper and lower CR in the brain. In the mediolateral direction, the average of the highest probabilistic locations for the upper and lower extremities were 40.27 and 37.16% at the upper CR level and 38.19 and 37.14% at the lower CR level, respectively. In the anteroposterior direction, the average of the highest probabilistic locations for the upper and lower extremities were 62.52 and 75.65% at the upper CR level and 60.19 and 68.12% at the lower CR level, respectively. The average distances between upper and lower extremities for the mediolateral direction were 2.41 mm at the upper CR level and 1.21 mm at the lower CR level. The average distances between upper and lower extremities for the anteroposterior direction were 5.23 mm at the upper CR level and 4.47 mm at the lower CR level, respectively. Our findings suggest that the anatomical location and somatotopic organization for the upper extremity are located anterolaterally to the lower extremity in the CR of a normal human brain and distances between the upper and lower extremities become decreased as the CST descends from the upper to the lower CR level.
    No preview · Article · Jun 2014 · Neuroreport
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    ABSTRACT: To investigate the predictive index of functional recovery after primary pontine hemorrhage (PPH) using the combined motor evoked potential (MEP) and somatosensory evoked potential (SEP) in comparison to the hematoma volume and transverse diameter measured with computerized tomography. Patients (n=14) with PPH were divided into good- and poor-outcome groups according to the modified Rankin Score (mRS). We evaluated clinical manifestations, radiological characteristics, and the combined MEP and SEP responses. The summed MEP and SEP (EP sum) was compared to the hematoma volume and transverse diameter predictive index of global disability, gait ability, and trunk stability in sitting posture. All measures of functional status and radiological parameters of the good-outcome group were significantly better than those of the poor-outcome group. The EP sum showed the highest value for the mRS and functional ambulatory category, and transverse diameter showed the highest value for "sitting-unsupported" of Berg Balance Scale. The combined MEP and SEP is a reliable and useful tool for functional recovery after PPH.
    Preview · Article · Feb 2014 · Annals of Rehabilitation Medicine
  • Hong Bo Sim · Young Cheol Weon · Jun Bum Park · Dong Seok Yang
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    ABSTRACT: Spinal epidural hematoma (SEH) can lead to progressive neurological deficits that are the result of spinal cord compression. Most of the reported cases of SEH had nontraumatic origins, and they were mainly in the acute stage. Traumatic SEH in a child is rare, and it is also difficult to diagnose because of the nonspecific pain and irritability of the child. We present here the first reported case of chronic traumatic SEH in a 3-yr-old boy. He was admitted with axillary pain and slowly progressive weakness after a fall that had occurred 4 wks before. On admission, he could not stand or hold a spoon. Magnetic resonance imaging revealed epidural hematomas from C5 to C7; these hematomas showed high signal intensity on the T1-weighted images and heterogeneous high-iso signal intensity on the T2-weighted images. After the surgical decompression, the patient showed a complete resolution of symptoms without any neurological sequelae. Our study suggests that a child with unexplained pain and motor weakness should undergo magnetic resonance imaging for making an early diagnosis. Chronic traumatic SEH in a child can be successfully treated by a surgical operation.
    No preview · Article · Nov 2010 · American journal of physical medicine & rehabilitation / Association of Academic Physiatrists
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    ABSTRACT: The medial lemniscus (ML) plays a critical role in sensory function and skillful movement. Using combined functional MRI (fMRI) and diffusion tensor tractography (DTT), we attempted to identify the ML pathway and quantify the characteristics of the ML compared to the corticospinal tract (CST). Eleven young healthy subjects without any history of neurological disorder were recruited for this study. For tracking of the ML, a seed region of interest (ROI) was determined using the fMRI activation in the primary sensorimotor cortex (SM1) following proprioceptive input, and a target ROI was given in the ML area of the pons. We were able to locate the ML in 9 out of 11 subjects. All ML started from the ML area just posterior to the transpontine fiber in the pons, and ascended to the SM1 posterolaterally to the cerebral peduncle of the midbrain, the posterior limb of the internal capsule (PLIC), and the corona radiata along with the CST. The fractional anisotropy (FA) value of the ML was similar to that of the CST. We could identify the ML pathway in the human brain using the combined fMRI/DTT method. These results and technique will be helpful for research about the ML in the human brain.
    No preview · Article · Jun 2009 · Neuroscience Letters
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    ABSTRACT: We investigated whether the integrity of the corticospinal tract classified by diffusion tensor tractography (DTT) can predict the motor outcome in 25 patients with pontine infarct. DTTs were obtained in the early stage of stroke (5-30 days) and were classified into two groups (type A: the integrity of corticospinal tract was preserved around the infarct; type B: corticospinal tract was interrupted). DTT type A patients showed better motor function than the type B patients at 6 months after onset. DTT obtained at the early stage of pontine infarct appears to have predictive value for motor outcome in patients with pontine infarct.
    Full-text · Article · Oct 2008 · Annals of Neurology

Publication Stats

75 Citations
17.93 Total Impact Points

Institutions

  • 2014
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
  • 2008-2014
    • University of Ulsan
      • • Department of Occupational and Environmental Medicine
      • • Department of Medicine
      Ulsan, Ulsan, South Korea