• Korean Journal of Biological Psychiatry
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• v.12 no.1
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• pp.32-41
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• 2005

Objective:Impaired processing of working memory is one of the cognitive deficits seen in patients with schizophrenia. This aimed at corroborating the differences in the brain activities involved in the process of working memory between patients with schizophrenia and the control subjects. Method:Fourteen patients with schizophrenia and 12 healthy volunteers were recruited in this study. Functional magnetic resonance imaging(fMRI) was used to assess cortical activities during the performance of a 2-back visual working memory paradigm using the Korean alphabet as mnemonic content. Results:Group analysis revealed that left lateral prefrontal cortex and right parietal lobule showed decreased cortical activities in the patient group. On the other hand, an increased activation in left superior and middle frontal gyrus, left middle temporal gyrus, right cuneus, both occipital lobes, right fusiform gyrus and right cingulate gyrus. The activation in left anterior lobe and both declive of cerebellum was also increased. Conclusions:This study showed a decreased activation in left lateral prefrontal and right parietal neural networks from the patient group and confirmed the earlier findings on the impaired working memory of patients with schizophrenia using fMRI investigation. The regions implicated in our study suggest an abnormal functioning of the fronto-parietal cortical areas that are critical to the information processing stream, which might be correspondent to common pathophysiology rather than a common etiology in schizophrenia.

• Journal of Korean Neurosurgical Society
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• v.46 no.1
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• pp.74-76
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• 2009

We present an extremely rare case of the atypical choroid plexus papilloma in an adult which developed at the trigone of right lateral ventricle. A 62-year-old woman presented with the history of intermittent and gradually progressive headache and left side hemiparesis for 6 months. The brain magnetic resonance image showed highly enhanced and well demarcated mass at the trigone of lateral ventricle attached to the choroid plexus. Gross total resection was performed by transcortical approach via the middle temporal gyrus. The tumor was diagnosed as an atypical choroid plexus papilloma. She had no neurologic deficit after the surgery. We report a case of atypical choroid plexus papilloma in adult and introduce newly classified pathologic characteristics of this tumor.

• Journal of Korean Neurosurgical Society
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• v.59 no.2
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• pp.168-171
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• 2016

Choroidal fissure cysts are often incidentally discovered. They are usually asymptomatic. The authors report a case of growing and hemorrhagic choroidal fissure cyst which was treated surgically. A 22-year-old female presented with headache. Cranial MRI showed a left-sided choroidal fissure cyst. Follow-up MRI showed that the size of the cyst had increased gradually. Twenty months later, the patient was admitted to our emergency department with severe headache. MRI and CT showed an intracystic hematoma. Although such cysts usually have a benign course without symptoms and progression, they may rarely present with intracystic hemorrhage, enlargement of the cyst and increasing symptomatology.

• Journal of Korean Neurosurgical Society
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• v.49 no.4
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• pp.226-228
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• 2011

We report a case of spontaneous right carotid-cavernous fistula (CCF) in a proximal segment of persistent primitive trigeminal artery (PPTA) and combined vascular anomalies such as left duplicated hypoplastic proximal posterior cerebral arteries and a variation of anterior choroidal artery supplying temporal and occipital lobe. A 45-year-old male presented with progressive right exophthalmos, diplopia, and ocular pain. With manual compression of the internal carotid artery, a cerebral angiography revealed a right CCF from a PPTA. Treatment involved the placement of detachable non-fibered and fibered coils, and use of a hyperglide balloon to protect against coil herniation into the internal carotid artery. A final angiograph revealed complete occlusion of PPTA resulted in no contrast filling of CCF.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.11a
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• pp.81-83
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• 2003

The present study attempted to observe what changes the supply of highly concentrated(30％) oxygen cause to people's ability and cerebrum lateralization of verbal cognition, compared to air of normal oxygen concentration(21％). The experiment consisted of two runs, one for verbal cognition test with normal air(21％ of oxygen) and for verbal cognition test with more oxygen in the air(30％ of oxygen). Functional brain images were taken form 3T MRI using the single-shot EPI method. There were more activations observed at the occipital, parietal, temporal, and frontal lobes, but there were no changes in cerebrum lateralization with 30％ oxygen administration. The result of task performance showed the accuracy increased at 30％'s concentration of oxygen rather than 21％'s. It is concluded that the positive effect on the verbal cognitive performance level by the highly concentrated oxygen administration was due to changeless increase of left and right cerebrum activation.

• Journal of Korean Neurosurgical Society
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• v.42 no.6
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• pp.478-480
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• 2007

Unruptured non-traumatic dissecting aneurysm in the M4 segment of the middle cerebral artery (MCA) accompanied by complete occlusion of the ipsilateral internal cerebral artery (ICA) has never been reported. A 41-year-old man presented with an infarction manifesting as left-sided weakness and dysarthria. Magnetic resonance angiography revealed a subacute stage infarction in the right MCA territory and complete occlusion of the right ICA. Angiography demonstrated aneurysmal dilatation of the M4 segment of the right MCA. Surgery was performed to prevent hemorrhage from the aneurysm. The aneurysm was proximally clipped guided by Navigation-CT angiography and flow to the distal MCA was restored by superficial temporal artery-middle cerebral artery (STA-MCA) anastornosis. We report this rare case with literature review.

• Journal of Korean Neurosurgical Society
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• v.43 no.4
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• pp.205-208
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• 2008

Astroblastoma is a rarely diagnosed primary brain neoplasm whose histogenesis has been clarified recently. It occurs in children and young adults and presents as a well circumscribed, contrast-enhancing lesion in the cerebral hemisphere. We present a case of 20-year-old woman with an astroblastoma in the left temporal convexity that was treated with total tumor resection alone. We thought the mass was extra-axial neoplasm based on radiological findings of computed tomography and magnetic resonance imaging initially, but later, we obtained angiographic findings suggesting an intra-axial neoplasm. The patient is doing well even two years after surgery. The characteristic radiological and histopathological features of this case are described with a literature review. An astroblastoma should be included in the differential diagnosis of a superficially located tumor presenting with the findings of an extra-axial mass, especially in a young patient.

• Annual Conference on Human and Language Technology
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• 1998.10c
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• pp.186-190
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• 1998

정상 피험자에 있어서 수행 성적의 차이를 보이는 음소적 단어 생성과 의미적 단어생성에 관련한 대뇌 피질의 활동양상의 차이를 밝히기 위해 피험자에게 단어 생성의 과제를 주면서 기능적 자기공명 영상술(functional magnetic resonance imaging, fMRI)을 시행하였다. 모두 7명의 정상인에서 음소 단서에 의한 단어생성은 의미 범주 단어에 의한 단어생성보다 광범위한 피질 영역의 활성화를 보였는데, 특히 bilateral posteroinferior temporal cortices, left premotor cortex, right cerebellum, bilateral superior parietal lobules에서 더 높은 활성화를 보였다. 이에 반하여 의미적 단어생성은 주로 bilateral posterior cingulate gyri에서 더 높은 활성화를 보였다. 이런 결과는 음소적 생성은 가능한 자모를 조합하여 어휘를 생성한 후 작업기억에 일시 저장시켜 놓고 verbal rehearsal 과정을 사용하여 단어 여부를 판별하는 것을 시사하며, 의미적 생성은 mental imagery를 통하여 시각적 인출 단서를 찾은 후, 의미 기억으로부터 단어를 직접 인출하는 것으로 보인다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.40 no.5
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• pp.246-249
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• 2014

Eagle syndrome is a rare condition caused by elongation of the styloid process or calcification of the stylohyoid ligament. Patients with Eagle syndrome typically present with dysphagia, dysphonia, cough, voice changes, otalgia, sore throat, facial pain, foreign body sensation, headache, vertigo, and neck pain. Here we report a case in which the patient initially presented with sore throat, left-sided facial pain, and cough. This case report provides a brief review of the diagnosis and nonsurgical management of this rare syndrome.

• Journal of Korean Physical Therapy Science
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• v.15 no.3
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• pp.9-17
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• 2008

Background : The conventional electroencephalography(EEG) is commonly used as aid in the diagnosis of dementia. Recently developed quantitative electroencephalography(qEEG) provides data that are not achievable by conventional EEG. The aim of this study was to find out the usefulness of quantified-EEG in dementia. Method : Twenty elderly women(10 normal elderly, 10 demented elderly) were participated in this study. EEG power and coherence was computed over 21 channels; right and left frontal, central, parietal, temporal and occipital areas. Result : The activity of ${\alpha}$ wave was more higher than others significantly at frontal and parietal areas in normal elderly, but the activity of ${\theta}$ wave was higher in demented elderly. And the activity of ${\theta}$ wave in demented elderly women was more higher than normal elderly women significantly. Conclusion : In conclusion, we discovered that quantitative EEG was used to diagnose dementia.