1.Craniospinal Neurenteric Cysts: Various MR Imaging Features.
Se Jeong JEON ; Chul Ho SOHN ; Eun Hee KIM ; Kyu Ri SON ; Sung Hye PARK ; Kee Hyun CHANG
Journal of the Korean Society of Magnetic Resonance in Medicine 2009;13(1):54-62
PURPOSE: Craniospinal neurenteric (NE) cysts are rare developmental non-neoplastic cysts of the central nervous system with diverse MR imaging findings. The purpose of this study was to evaluate various MR imaging findings of intracranial and intraspinal NE cysts. MATERIALS AND METHODS: We retrospectively reviewed the MR imaging findings of six NE cysts that were confirmed by pathology. We evaluated anatomic location, signal intensity, size and enhancement pattern of NE cysts. RESULTS: Two intracranial lesions were located extra-axially in the cerebellopontine angle and quadrigeminal cisterns. Three spinal lesions were intraduralextramedullary cysts, located ventral to the spinal cord, but one thoracic lesion was an intramedullary cyst. The signal intensity of the cysts was hyperintense on T1-weighted images as compared with the cerebrospinal fluid (CSF) for two intracranial lesions and one cervical lesion. In addition, all intracranial lesions showed diffusion restriction. For the remaining three spinal lesions, the signal intensity was nearly the same as the signal intensity of the CSF as seen on both T1- and T2-weighted images. On contrast-enhanced studies, two intracranial cysts showed a small nodular enhancement and one thoracic spinal lesion showed rim enhancement. CONCLUSION: NE cysts have various locations, signal intensities, and possible focal nodular or rim enhancement. Therefore, NE cysts can be included in the differential diagnosis of various craniospinal cystic or tumorous cystic lesions.
Central Nervous System
;
Cerebellopontine Angle
;
Diagnosis, Differential
;
Diffusion
;
Neural Tube Defects
;
Retrospective Studies
;
Spinal Cord
2.Disconnection of the Rubber Tip of Arrow-Trerotola Percutaneous Thrombolytic Device.
Han Myun KIM ; Hyo Cheol KIM ; Sungmin WOO ; Kyu Ri SON ; Hwan Jun JAE
Korean Journal of Radiology 2014;15(2):254-257
A rubber tip disconnection of Arrow-Trerotola percutaneous thrombolytic device (PTD) may occur occasionally. We experienced 5 cases of a rubber tip disconnection among 453 mechanical thrombectomy sessions with the use of PTD. We present a report about these five cases and suggest possible causes for the occurrences.
Aged
;
Catheter Obstruction/*etiology
;
Equipment Failure Analysis/*methods
;
Female
;
Humans
;
Male
;
Middle Aged
;
Renal Dialysis/*instrumentation
;
Rubber
;
Thrombectomy/*instrumentation
;
Treatment Outcome
3.Remote Cerebral and Cerebellar Hemorrhage after Massive Cerebrospinal Fluid Leakage.
Sung Hye YOU ; Kyu Ri SON ; Nam Joon LEE ; Jung Keun SUH
Journal of Korean Neurosurgical Society 2012;51(4):240-243
Dural tears can occur during spinal surgery and may lead to cerebrospinal fluid (CSF) leakage which is rarely involved in remote cerebellar hemorrhage. Only a few of cases of simultaneous cerebral and cerebellar hemorrhage have been reported in the English literature. We experienced a case of multiple remote cerebral and cerebellar hemorrhages in a 63-year-old man who exhibited no significant neurologic deficits after spinal surgery. Magnetic resonance imaging (MRI) performed 4 days after the surgery showed a large amount of CSF leakage in the lumbosacral space. The patient underwent the second surgery for primary repair of the dural defect, but complained of headache after dural repair surgery. Brain MRI taken 6 days after the dural repair surgery revealed multifocal remote intracerebral and cerebellar hemorrhages in the right temporal lobe and both cerebellar hemispheres. We recommend diagnostic imaging to secure early identification and treatment of this complication in order to prevent serious neurologic deficits.
Brain
;
Diagnostic Imaging
;
Headache
;
Hemorrhage
;
Humans
;
Magnetic Resonance Imaging
;
Middle Aged
;
Neurologic Manifestations
;
Temporal Lobe
4.Remote Cerebral and Cerebellar Hemorrhage after Massive Cerebrospinal Fluid Leakage.
Sung Hye YOU ; Kyu Ri SON ; Nam Joon LEE ; Jung Keun SUH
Journal of Korean Neurosurgical Society 2012;51(4):240-243
Dural tears can occur during spinal surgery and may lead to cerebrospinal fluid (CSF) leakage which is rarely involved in remote cerebellar hemorrhage. Only a few of cases of simultaneous cerebral and cerebellar hemorrhage have been reported in the English literature. We experienced a case of multiple remote cerebral and cerebellar hemorrhages in a 63-year-old man who exhibited no significant neurologic deficits after spinal surgery. Magnetic resonance imaging (MRI) performed 4 days after the surgery showed a large amount of CSF leakage in the lumbosacral space. The patient underwent the second surgery for primary repair of the dural defect, but complained of headache after dural repair surgery. Brain MRI taken 6 days after the dural repair surgery revealed multifocal remote intracerebral and cerebellar hemorrhages in the right temporal lobe and both cerebellar hemispheres. We recommend diagnostic imaging to secure early identification and treatment of this complication in order to prevent serious neurologic deficits.
Brain
;
Diagnostic Imaging
;
Headache
;
Hemorrhage
;
Humans
;
Magnetic Resonance Imaging
;
Middle Aged
;
Neurologic Manifestations
;
Temporal Lobe
5.Importance and requirements for dental prosthesis order platform services: a survey of dental professionals
Gyu-Ri KIM ; Keunbada SON ; Du-Hyeong LEE ; So-Yeun KIM ; Myoung-Uk JIN ; Kyu-Bok LEE
Journal of Dental Rehabilitation and Applied Science 2023;39(3):105-118
Purpose:
This study aimed to gain better understanding of the importance of dental prosthesis order platform services and to identify the essential elements for their enhancement and wider adoption among dental professionals.
Materials and Methods:
A survey was conducted to assess the perspectives of dentists, dental technicians, dental hygienists, and dental industry professionals toward dental prosthesis ordering and associated platform services (a total of 53 respondents). The questionnaire was devised after an expert review and assessed for reliability using Cronbach’s alpha coefficient. Factor analysis revealed that 57 factors across five categories accounted for 88.417% of the total variance. The survey was administered through an online questionnaire platform, and data analysis was conducted using a statistical software, employing one-way analysis of variance and Tukey’s honestly significant difference test (α = 0.05).
Results:
The essential elements identified were accurate information input, effective communication, delivery of distortion-free impressions, convenience in data transmission and storage, development of stable and affordable platform services (P < 0.05). Furthermore, significant differences were observed in the importance of these items based on age, dental profession, and career experience (P < 0.05).
Conclusion
The dental prosthesis ordering platform services, the requirements of dental personnel were stability, economic efficiency, and ease of transmitting and storing prosthesis data. The findings can serve as important indicators for the development and improvement of dental prosthesis order platform services.
6.Serial MR Analysis of Early Permanent and Transient Ischemia in Rats: Diffusion Tensor Imaging and High b Value Diffusion Weighted Imaging.
Ji Hoon KIM ; Dong Gyu NA ; Kee Hyun CHANG ; In Chan SONG ; Seung Hong CHOI ; Kyu Ri SON ; Kyung Won KIM ; Chul Ho SOHN
Korean Journal of Radiology 2013;14(2):307-315
OBJECTIVE: To evaluate the temporal evolution and diagnostic values of the diffusion tensor imaging (DTI) and the high b value diffusion weighted imaging (DWI) in the early permanent and transient cerebral ischemia. MATERIALS AND METHODS: For permanent or 30-minute transient-ischemia induced 30 rats, DTI and DWIs at both high b (b = 3000 s/mm2) and standard b value (b = 1000 s/mm2) were obtained at the following conditions: at 15, 30, 45, 60 minutes after the occlusion of what for hyperacute permanent ischemia; at 1, 3, 5, 7, 9 hours after the occlusion for acute permanent ischemia; and at 15 minutes before reperfusion, 0.5, 2.5, and 24 hours after reperfusion for transient ischemia. The diffusion parameters and their ratios were obtained and compared between different b values, and among different time points and groups, respectively. RESULTS: For both b values, the apparent diffusion coefficient (ADC) ratio decreased for first three hours, and then slightly increased until 9 hours after the occlusion during a gradual continuous increase of DWI signal intensity (SI) ratio, with excellent correlation between ADC ratios and DWI SI ratios. The DWI showed a higher contrast ratio, but the ADC map showed a lower contrast ratio for permanent ischemia at high b value than at standard b value. Fractional anisotropy (FA) increased for 1 hour, then gradually decreased until 9 hours after the occlusion in permanent ischemia and showed transient normalization and secondary decay along with change in ADC in transient ischemia. CONCLUSION: This study presents characteristic initial elevation and secondary decay of FA, higher contrast ratio of DWI, and lower contrast ratio of ADC map at high b value, in addition to the time evolutions of diffusion parameters in early permanent and transient ischemia.
Animals
;
Contrast Media/diagnostic use
;
Diffusion Magnetic Resonance Imaging/*methods
;
Gadolinium DTPA/diagnostic use
;
Ischemic Attack, Transient/*diagnosis
;
Male
;
Rats
;
Rats, Sprague-Dawley
7.Interventional Management after Gastrectomy: The Spectrum of Imaging Findings and Procedures.
Hyo Cheol KIM ; Joon Koo HAN ; Kyoung Won KIM ; Kyu Ri SON ; Byung Ihn CHOI
Journal of the Korean Radiological Society 2008;58(4):381-389
Gastric cancer is the most common cancer in Korea, and is often treated by surgical resection. Many postoperative complications or tumor recurrence, however, are managed by the use of imaging-guided interventions. This review describes the spectrum of postoperative complications that occur following gastrectomy, with an emphasis on the interventional procedures used to manage postoperative complications and tumor recurrence.
Gastrectomy
;
Korea
;
Neoplasm Recurrence, Local
;
Postoperative Complications
;
Radiography, Interventional
;
Recurrence
;
Stomach Neoplasms
;
Tomography, X-Ray Computed
8.Mediastinal and Extrapleural Fat Hypertrophy in Idiopathic Pulmonary Fibrosis on High-resolution CT: Comparison with Normal Individuals.
Kyu Ri SON ; Hyun Ju LEE ; Kun Young LIM ; Chang Hyun LEE ; Jin Mo GOO ; Jung Gi IM
Journal of the Korean Radiological Society 2004;51(6):621-626
PURPOSE: We wished to compare the amount of mediastinal and extrapleural fat on high resolution CT for patients with idiopathic pulmonary fibrosis (IPF) with that of normal individuals, and we wished to evaluate the correlation between the amount of fat and the degree of pulmonary fibrosis. MATERIALS AND METHODS: We selected a group of 25 patients with radiologically and clinically diagnosed IPF and we also selected another group of 25 age and gender-matched patients having no abnormalities on pulmonary function testing as well as HRCT as controls from our radiologic database search (mean age: 59 years, M:F=11:14). We measured the area of mediastinal and extrapleural fat at the levels of the aortic arch and at the origin of the right pulmonary artery and right inferior pulmonary vein on three sections of HRCT by using software (Rapidia; 3DMED, Seoul, Korea). The total amount of fat was calculated by summing up the areas of the mediastinal and extrapleural fat, which is corrected by the body mass index; we also evaluated statistical differences between the two groups. At same sections of CT, the ratio (%) of the honeycombing area to the total areas of the lung was calculated. We evaluated the relationship between the amount of extrapleural or mediastinal fat with the ratio (%) of the honeycombing area. RESULTS: The total amount of fat in patients with IPF and normal individuals were 67.24+/-19.03 cm2 and 32.55+/-11.91 cm2, respectively. The fat amount corrected by body mass index was 280.48+/-74.43 mm2/kg/m2 in the IPF patients and 137.06+/-41.76 mm2/kg/m2 in normal individuals. The differences between two groups for the total amount of fat and fat amount, as corrected for by the body mass index, were statistically significant (p<0.0001). The ratio (%) of the honeycombing area and the total amount of fat showed a moderate correlation (rho= 0.43, p= 0.032). CONCLUSION:Patients with IPF have a larger amount of mediastinal and extrapleural fat than normal individuals. The hypertrophy of mediastinal and extrapleural fat in IPF may be affected by the severity of the interstitial fibrosis of the lung.
Aorta, Thoracic
;
Body Mass Index
;
Fibrosis
;
Humans
;
Hypertrophy*
;
Idiopathic Pulmonary Fibrosis*
;
Lung
;
Mediastinum
;
Pulmonary Artery
;
Pulmonary Fibrosis
;
Pulmonary Veins
;
Respiratory Function Tests
;
Seoul
9.Detection of the Anatomic Structure and Pathology in Animal Lung Specimens: Comparison of Micro CT and Multi-Detector Row CT.
Kun Young LIM ; Hyun Ju LEE ; Chang Hyun LEE ; Kyu Ri SON ; Joon Beom SEO ; Jin Mo GOO ; Jung Gi IM
Journal of the Korean Radiological Society 2006;54(5):385-391
PURPOSE: We wanted to compare the capability of micro CT and the clinically available thin-slice multi-detector row CT (MDCT) for demonstrating fine anatomic structures and pathological lesions in formalin-fixed lung specimens. MATERIALS AND METHODS: The porcine lung with shark liver oil-induced lipoid pneumonia and the canine lung with pulmonary paragonimiasis were fixed by ventilating them with formalin vapor, and they were then sliced into one-centimeter thick sections. Micro CT (section thickness, 18 micrometer) and MDCT (section thickness, 0.75 mm) images were acquired in four of the lung slices of the lipoid pneumonia specimen and in five of the lung slices of the paragonimiasis specimen. On 62 pairs of micro CT and MDCT images, 169 pairs of rectangular ROIs were manually drawn in the corresponding locations. Two chest radiologists recorded the detectability of three kinds of anatomic structures (lobular core structure, interlobular septum and small bronchiolar lumen) and two kinds of pathological lesions (ground-glass opacity and consolidation) with using a five-point scale. The statistical comparison was performed by using the Wilcoxon signed rank test. Interobserver agreement was evaluated with kappa statistics. RESULTS: For all observers, all the kinds of anatomic structures and pathological lesions were detected better on the micro CT images than on the MDCT images (p<0.01). Agreement was fair between two observers (kappa = 0.38, p<0.001). CONCLUSION: The fine anatomic structures and pathological lesions of the lung were more accurately demonstrated on micro CT than on thin-slice MDCT in the inflated and fixed lung specimens.
Animals*
;
Formaldehyde
;
Liver
;
Lung*
;
Paragonimiasis
;
Pathology*
;
Pneumonia
;
Sharks
;
Thorax
10.Predicting Extrathyroidal Extension in Patients With Papillary Thyroid Microcarcinoma According to a BRAF Mutation.
Doh Young LEE ; Soo Min HWANG ; Jee Hyun AN ; Kyu Ri SON ; Seung Kuk BAEK ; Sin Gon KIM ; Yang Seok CHAE ; Kwang Yoon JUNG
Clinical and Experimental Otorhinolaryngology 2017;10(2):174-180
OBJECTIVES: The aim of this study was to evaluate the association between preoperative parameters and extrathyroidal extension (ETE) of papillary thyroid microcarcinoma (PTMC) according to the BRAF mutation and to evaluate the preoperative predictability of ETE. METHODS: We analyzed the medical records of 332 patients with PTMC (140 in the BRAF– group and 192 in the BRAF+ group). The presence of ETE was subjected to a correlation analysis with age, sex, tumor size, clinical nodal status, and ultrasonography (US) findings. Among the US findings, the correlation between tumors and the thyroid capsule was categorized into four groups; US group A, intraparechymal; US group B, tumor abutting the capsule <50% of diameter; US group C, tumor abutting >50% of diameter; and US group D, tumor destroyed the capsule. The predictive value of ETE, including sensitivity, specificity, and positive and negative predictive values were evaluated. RESULTS: Tumor size and US group were significantly correlated with gross ETE in the BRAF– and BRAF+ groups. Tumor size of 0.5 cm and US groups B and C in the BRAF– group were cutoff values for gross ETE, with a negative predictive value of 100%, whereas tumor size of 0.7 cm and US groups A and B in the BRAF+ group had negative predictive values of 92.4% and 100%, respectively. CONCLUSION: Excluding of ETE by US was categorized according to tumor size and US findings. A different categorization to exclude ETE is needed according to the BRAF mutation.
Capsules
;
Humans
;
Medical Records
;
Sensitivity and Specificity
;
Thyroid Gland*
;
Ultrasonography