The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jeong-min Hwang - One of the best experts on this subject based on the ideXlab platform.
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teaching neuroimages pupil sparing Oculomotor Nerve palsy with posterior communicating artery aneurysm
Neurology, 2020Co-Authors: Hee Kyung Yang, Jae Hyoung Kim, Jeong-min HwangAbstract:A 66-year-old woman presented with ptosis and diplopia 2 weeks prior. She showed ptosis and limited adduction, elevation, and depression in the left eye (figure, A). Her pupils were isocoric and reactive (figure, B). Transfemoral left internal carotid angiography (figure, C) revealed a 5-mm elongated aneurysm with inferior projection (arrows) at the posterior communicating artery origin. Contrast-enhanced thin-section T1-weighted coronal image (figure, D) showed the aneurysm (short arrows) compressing the left Oculomotor Nerve at the cavernous sinus. The right Oculomotor Nerve traversing in the cavernous sinus was normally well identified as a round low signal (long arrow). This case violates the “rule of the pupil” proven with pupillography.1,2
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morphometry of the Oculomotor Nerve in duane s retraction syndrome
Journal of Clinical Medicine, 2020Co-Authors: Min Seok Kang, Jae Hyoung Kim, Hee Kyung Yang, Jounghan Kim, Jeong-min HwangAbstract:Objective: To investigate the morphometric characteristics of the Oculomotor Nerve and its association with horizontal rectus muscle volume in patients with Duane’s retraction syndrome (DRS) according to the presence of the abducens Nerve. Methods: Fifty patients diagnosed with unilateral DRS were divided into two groups according to high-resolution magnetic resonance imaging (MRI) findings; DRS without an abducens Nerve on the affected side (absent group, n = 41), and DRS with symmetric abducens Nerves on both sides (present group, n = 9). Oculomotor Nerve diameter was measured on high-resolution MRI in the middle of the cisternal space. The medial rectus muscle (MR) and lateral rectus muscle (LR) volumes were measured on T2-weighted coronal MRI of the orbit. Associations of Oculomotor Nerve diameter and horizontal rectus muscle volumes were performed according to the presence and absence of the abducens Nerve. Results: Oculomotor Nerve diameter on the affected side was thicker than that of the non-affected side in the absent group (p < 0.001), but not in the present group (p = 0.623). In the absent group, there was a positive correlation between Oculomotor Nerve diameter and MR volume (r = 0.779, p < 0.001), as well as the LR volume (r = 668, p = 0.023) of the affected eye. Conclusions: In DRS patients with an absent abducens Nerve, the Oculomotor Nerve diameter was thicker in the affected eye compared to the non-affected eye. Oculomotor Nerve diameter was associated with MR and LR volumes in the absent group. This study provides structural correlates of aberrant innervation of the Oculomotor Nerve in DRS patients.
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Oculomotor Nerve tumors masquerading as recurrent painful ophthalmoplegic neuropathy report of two cases and review of the literature
Cephalalgia, 2015Co-Authors: Ryul Kim, Jeong-min Hwang, Jae Hyoung Kim, Hee Kyung Yang, Eunhee Kim, Ji Soo KimAbstract:BackgroundIn recurrent painful ophthalmoplegic neuropathy (RPON) that was previously termed as ophthalmoplegic migraine, enhancement of the ocular motor cranial Nerves could be seen in the cisternal segment during the acute phase. However, various tumors involving the Oculomotor Nerve may mimic RPON.MethodsWe report two patients with MRI findings of Oculomotor Nerve schwannoma who initially presented with RPON, and found through the literature review five more patients with Oculomotor Nerve tumors that masqueraded as RPON.ResultsAll patients showed an involvement of the Oculomotor Nerve. The radiological or pathological diagnosis included schwannoma in five, venous angioma in one, and neuromuscular harmatoma in another one. MRIs with gadolinium documented an enhancing nodule involving the cisternal portion of the Oculomotor Nerve in six of them, which was also observed on follow-up MRIs without an interval change.ConclusionsIt should be recognized that an incomplete recovery may occur during future attack...
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magnetic resonance imaging in three patients with congenital Oculomotor Nerve palsy
British Journal of Ophthalmology, 2009Co-Authors: Jae Hyoung Kim, Jeong-min HwangAbstract:The underlying pathology of congenital Oculomotor Nerve palsy has not been determined. A previous MRI study reported that only one out of three patients showed bilateral Oculomotor Nerve hypoplasia; the two remaining patients had subarachnoid Oculomotor Nerves of normal size.1 This variability suggests heterogeneity in the pathogenesis of congenital Oculomotor Nerve palsy. This report describes the use of MRI to verify the pathology of the extraocular muscles as well as the cranial Nerves in three patients with congenital Oculomotor Nerve palsy. This study was undertaken following the tenets of the Declaration of Helsinki and received an approval from Institutional Review Board of Seoul National University Bundang Hospital. A 6-month-old girl presented with an inability to elevate the right eye. There was an intermittent exotropia of 20 dioptres (PD). Ductions and versions showed underaction of elevation, depression and adduction OD (fig 1A). MRI showed normal right and left Oculomotor Nerves and slightly atrophic right inferior rectus (fig …
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hypoplastic Oculomotor Nerve and absent abducens Nerve in congenital fibrosis syndrome and synergistic divergence with magnetic resonance imaging
Ophthalmology, 2005Co-Authors: Jae Hyoung Kim, Jeong-min HwangAbstract:Objective There is only one neuropathologic report of congenital fibrosis of the extraocular muscles (CFEOM), and none of synergistic divergence. The aim of this report was to study the Oculomotor Nerve and the abducens Nerve in 2 such patients with magnetic resonance imaging. Design Observational case reports. Methods Ophthalmologic examination and thin-sectioned magnetic resonance imaging across the brainstem level were performed in 2 patients with CFEOM and synergistic divergence. To confirm the accuracy of the procedure, we compared the results obtained with those of a control group of 40 individuals using the same technique. Main Outcome Measures The Oculomotor Nerve and the abducens Nerve on magnetic resonance imaging. Results Magnetic resonance imaging disclosed bilateral hypoplasia of the Oculomotor Nerve in both patients, and absence of the abducens Nerve on the affected side of synergistic divergence. The Oculomotor and abducens Nerves were observed in 80 of 80 eyes (100%) screened as controls. Conclusions In both patients with CFEOM and synergistic divergence, the Oculomotor Nerve was hypoplastic bilaterally, and the abducens Nerve was absent on the side exhibiting synergistic divergence.
Jae Hyoung Kim - One of the best experts on this subject based on the ideXlab platform.
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teaching neuroimages pupil sparing Oculomotor Nerve palsy with posterior communicating artery aneurysm
Neurology, 2020Co-Authors: Hee Kyung Yang, Jae Hyoung Kim, Jeong-min HwangAbstract:A 66-year-old woman presented with ptosis and diplopia 2 weeks prior. She showed ptosis and limited adduction, elevation, and depression in the left eye (figure, A). Her pupils were isocoric and reactive (figure, B). Transfemoral left internal carotid angiography (figure, C) revealed a 5-mm elongated aneurysm with inferior projection (arrows) at the posterior communicating artery origin. Contrast-enhanced thin-section T1-weighted coronal image (figure, D) showed the aneurysm (short arrows) compressing the left Oculomotor Nerve at the cavernous sinus. The right Oculomotor Nerve traversing in the cavernous sinus was normally well identified as a round low signal (long arrow). This case violates the “rule of the pupil” proven with pupillography.1,2
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morphometry of the Oculomotor Nerve in duane s retraction syndrome
Journal of Clinical Medicine, 2020Co-Authors: Min Seok Kang, Jae Hyoung Kim, Hee Kyung Yang, Jounghan Kim, Jeong-min HwangAbstract:Objective: To investigate the morphometric characteristics of the Oculomotor Nerve and its association with horizontal rectus muscle volume in patients with Duane’s retraction syndrome (DRS) according to the presence of the abducens Nerve. Methods: Fifty patients diagnosed with unilateral DRS were divided into two groups according to high-resolution magnetic resonance imaging (MRI) findings; DRS without an abducens Nerve on the affected side (absent group, n = 41), and DRS with symmetric abducens Nerves on both sides (present group, n = 9). Oculomotor Nerve diameter was measured on high-resolution MRI in the middle of the cisternal space. The medial rectus muscle (MR) and lateral rectus muscle (LR) volumes were measured on T2-weighted coronal MRI of the orbit. Associations of Oculomotor Nerve diameter and horizontal rectus muscle volumes were performed according to the presence and absence of the abducens Nerve. Results: Oculomotor Nerve diameter on the affected side was thicker than that of the non-affected side in the absent group (p < 0.001), but not in the present group (p = 0.623). In the absent group, there was a positive correlation between Oculomotor Nerve diameter and MR volume (r = 0.779, p < 0.001), as well as the LR volume (r = 668, p = 0.023) of the affected eye. Conclusions: In DRS patients with an absent abducens Nerve, the Oculomotor Nerve diameter was thicker in the affected eye compared to the non-affected eye. Oculomotor Nerve diameter was associated with MR and LR volumes in the absent group. This study provides structural correlates of aberrant innervation of the Oculomotor Nerve in DRS patients.
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Oculomotor Nerve tumors masquerading as recurrent painful ophthalmoplegic neuropathy report of two cases and review of the literature
Cephalalgia, 2015Co-Authors: Ryul Kim, Jeong-min Hwang, Jae Hyoung Kim, Hee Kyung Yang, Eunhee Kim, Ji Soo KimAbstract:BackgroundIn recurrent painful ophthalmoplegic neuropathy (RPON) that was previously termed as ophthalmoplegic migraine, enhancement of the ocular motor cranial Nerves could be seen in the cisternal segment during the acute phase. However, various tumors involving the Oculomotor Nerve may mimic RPON.MethodsWe report two patients with MRI findings of Oculomotor Nerve schwannoma who initially presented with RPON, and found through the literature review five more patients with Oculomotor Nerve tumors that masqueraded as RPON.ResultsAll patients showed an involvement of the Oculomotor Nerve. The radiological or pathological diagnosis included schwannoma in five, venous angioma in one, and neuromuscular harmatoma in another one. MRIs with gadolinium documented an enhancing nodule involving the cisternal portion of the Oculomotor Nerve in six of them, which was also observed on follow-up MRIs without an interval change.ConclusionsIt should be recognized that an incomplete recovery may occur during future attack...
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magnetic resonance imaging in three patients with congenital Oculomotor Nerve palsy
British Journal of Ophthalmology, 2009Co-Authors: Jae Hyoung Kim, Jeong-min HwangAbstract:The underlying pathology of congenital Oculomotor Nerve palsy has not been determined. A previous MRI study reported that only one out of three patients showed bilateral Oculomotor Nerve hypoplasia; the two remaining patients had subarachnoid Oculomotor Nerves of normal size.1 This variability suggests heterogeneity in the pathogenesis of congenital Oculomotor Nerve palsy. This report describes the use of MRI to verify the pathology of the extraocular muscles as well as the cranial Nerves in three patients with congenital Oculomotor Nerve palsy. This study was undertaken following the tenets of the Declaration of Helsinki and received an approval from Institutional Review Board of Seoul National University Bundang Hospital. A 6-month-old girl presented with an inability to elevate the right eye. There was an intermittent exotropia of 20 dioptres (PD). Ductions and versions showed underaction of elevation, depression and adduction OD (fig 1A). MRI showed normal right and left Oculomotor Nerves and slightly atrophic right inferior rectus (fig …
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hypoplastic Oculomotor Nerve and absent abducens Nerve in congenital fibrosis syndrome and synergistic divergence with magnetic resonance imaging
Ophthalmology, 2005Co-Authors: Jae Hyoung Kim, Jeong-min HwangAbstract:Objective There is only one neuropathologic report of congenital fibrosis of the extraocular muscles (CFEOM), and none of synergistic divergence. The aim of this report was to study the Oculomotor Nerve and the abducens Nerve in 2 such patients with magnetic resonance imaging. Design Observational case reports. Methods Ophthalmologic examination and thin-sectioned magnetic resonance imaging across the brainstem level were performed in 2 patients with CFEOM and synergistic divergence. To confirm the accuracy of the procedure, we compared the results obtained with those of a control group of 40 individuals using the same technique. Main Outcome Measures The Oculomotor Nerve and the abducens Nerve on magnetic resonance imaging. Results Magnetic resonance imaging disclosed bilateral hypoplasia of the Oculomotor Nerve in both patients, and absence of the abducens Nerve on the affected side of synergistic divergence. The Oculomotor and abducens Nerves were observed in 80 of 80 eyes (100%) screened as controls. Conclusions In both patients with CFEOM and synergistic divergence, the Oculomotor Nerve was hypoplastic bilaterally, and the abducens Nerve was absent on the side exhibiting synergistic divergence.
Timothee Jacquesson - One of the best experts on this subject based on the ideXlab platform.
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diffusion tensor imaging tractography detecting isolated Oculomotor Nerve damage after traumatic brain injury
World Neurosurgery, 2017Co-Authors: Timothee Jacquesson, Carole Frindel, Francois CottonAbstract:A 24-year-old woman was hit by a bus and suffered an isolated complete Oculomotor Nerve palsy. Computed tomography scan did not show a skull base fracture. T2*-weighted magnetic resonance imaging revealed petechial cerebral hemorrhages sparing the brainstem. T2 constructive interference in steady state suggested a partial sectioning of the left Oculomotor Nerve just before entering the superior orbital fissure. Diffusion tensor imaging fiber tractography confirmed a sharp arrest of the left Oculomotor Nerve. This recent imaging technique could be of interest to assess white fiber damage and help make a diagnosis or prognosis.
Cristiano Oliveira - One of the best experts on this subject based on the ideXlab platform.
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teaching neuroimages pupil sparing compression of Oculomotor Nerve by posterior cerebral artery vessel
Neurology, 2020Co-Authors: Anfei Li, Anika Tandon, Apostolos John Tsiouris, Marc Dinkin, Cristiano OliveiraAbstract:A 54-year-old woman presented with a 30-year history of worsening left blepharoptosis. Neuro-ophthalmic examination was significant for blepharoptosis, limited levator function, and supraduction in the left eye with left hypotropia, and normal pupils without diplopia. MRI brain/orbits revealed subtle atrophy of the left superior rectus (figure 1, A and B), without any orbital pathology. Superior compression of the left Oculomotor Nerve by the posterior cerebral artery (PCA) was observed (figure 1, C–E). Given the microanatomy of Oculomotor Nerve in the cistern space,1,2 this is a rare selective compression of the superolateral Oculomotor Nerve by the PCA vessel (figure 2), sparing the superomedial parasympathetic limb.
Hee Kyung Yang - One of the best experts on this subject based on the ideXlab platform.
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teaching neuroimages pupil sparing Oculomotor Nerve palsy with posterior communicating artery aneurysm
Neurology, 2020Co-Authors: Hee Kyung Yang, Jae Hyoung Kim, Jeong-min HwangAbstract:A 66-year-old woman presented with ptosis and diplopia 2 weeks prior. She showed ptosis and limited adduction, elevation, and depression in the left eye (figure, A). Her pupils were isocoric and reactive (figure, B). Transfemoral left internal carotid angiography (figure, C) revealed a 5-mm elongated aneurysm with inferior projection (arrows) at the posterior communicating artery origin. Contrast-enhanced thin-section T1-weighted coronal image (figure, D) showed the aneurysm (short arrows) compressing the left Oculomotor Nerve at the cavernous sinus. The right Oculomotor Nerve traversing in the cavernous sinus was normally well identified as a round low signal (long arrow). This case violates the “rule of the pupil” proven with pupillography.1,2
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morphometry of the Oculomotor Nerve in duane s retraction syndrome
Journal of Clinical Medicine, 2020Co-Authors: Min Seok Kang, Jae Hyoung Kim, Hee Kyung Yang, Jounghan Kim, Jeong-min HwangAbstract:Objective: To investigate the morphometric characteristics of the Oculomotor Nerve and its association with horizontal rectus muscle volume in patients with Duane’s retraction syndrome (DRS) according to the presence of the abducens Nerve. Methods: Fifty patients diagnosed with unilateral DRS were divided into two groups according to high-resolution magnetic resonance imaging (MRI) findings; DRS without an abducens Nerve on the affected side (absent group, n = 41), and DRS with symmetric abducens Nerves on both sides (present group, n = 9). Oculomotor Nerve diameter was measured on high-resolution MRI in the middle of the cisternal space. The medial rectus muscle (MR) and lateral rectus muscle (LR) volumes were measured on T2-weighted coronal MRI of the orbit. Associations of Oculomotor Nerve diameter and horizontal rectus muscle volumes were performed according to the presence and absence of the abducens Nerve. Results: Oculomotor Nerve diameter on the affected side was thicker than that of the non-affected side in the absent group (p < 0.001), but not in the present group (p = 0.623). In the absent group, there was a positive correlation between Oculomotor Nerve diameter and MR volume (r = 0.779, p < 0.001), as well as the LR volume (r = 668, p = 0.023) of the affected eye. Conclusions: In DRS patients with an absent abducens Nerve, the Oculomotor Nerve diameter was thicker in the affected eye compared to the non-affected eye. Oculomotor Nerve diameter was associated with MR and LR volumes in the absent group. This study provides structural correlates of aberrant innervation of the Oculomotor Nerve in DRS patients.
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Oculomotor Nerve tumors masquerading as recurrent painful ophthalmoplegic neuropathy report of two cases and review of the literature
Cephalalgia, 2015Co-Authors: Ryul Kim, Jeong-min Hwang, Jae Hyoung Kim, Hee Kyung Yang, Eunhee Kim, Ji Soo KimAbstract:BackgroundIn recurrent painful ophthalmoplegic neuropathy (RPON) that was previously termed as ophthalmoplegic migraine, enhancement of the ocular motor cranial Nerves could be seen in the cisternal segment during the acute phase. However, various tumors involving the Oculomotor Nerve may mimic RPON.MethodsWe report two patients with MRI findings of Oculomotor Nerve schwannoma who initially presented with RPON, and found through the literature review five more patients with Oculomotor Nerve tumors that masqueraded as RPON.ResultsAll patients showed an involvement of the Oculomotor Nerve. The radiological or pathological diagnosis included schwannoma in five, venous angioma in one, and neuromuscular harmatoma in another one. MRIs with gadolinium documented an enhancing nodule involving the cisternal portion of the Oculomotor Nerve in six of them, which was also observed on follow-up MRIs without an interval change.ConclusionsIt should be recognized that an incomplete recovery may occur during future attack...
