No abstract available.
Bronchiolitis*

CT provides a valuable new perspective in assessing abnormalities of the thorax. In patients with amediastinal mass or widening detected by plain chest radiography, a definite diagnosis is sometimes possible whichwould not obtainable by conventional radiological technique. Clinical staging of bronchogenic carcinoma can beachieved by CT better than any other radiologic method. In fifty patients with histologically or angiographically confirmed disease of the thorax,an analysis of chest radiography and chest CT manifestations was made, and theresults were as follows; 1. 27 patients with mediastinal mass detected by chest radiography, a definite diagnosiswas possible in 10 patients (36%), who were 6 with teratodermoid, 1 with thymic cyst, 3 with aneurysm. In allpatients, the extent and localization of mediastinal mass could be established more precisely than by the chestradiography. 2. In 15 patients wtih bronchogenic carcinoma, 9 patients (60%) showed hilar adenopathy ormediastinal adenopathy which could not be noted on the chest radiography. 3. Main CT findings of braonchogeniccarcinoma were peripheral lung mass, spiculated or lobulated margin, adhesion to pleura or chest wall, andatelectasis or chronic pneumonia. 4. Commonly observed CT findings of teratodermoid were well capsulated mass,calcification, fat density , and multi-loculation. 5. Commonly observed CT findings of thymoma were homogenousmass, round contour, partially preserved mediastinal fat. CT was superior in evaluation of mediastinum and in the detemination of the extent of known bronchogenic carcinoma.
Aneurysm ; Carcinoma, Bronchogenic ; Diagnosis ; Humans ; Lung ; Mediastinal Cyst ; Mediastinum ; Methods ; Pleura ; Pneumonia ; Radiography ; Thoracic Wall ; Thorax ; Thymoma ; Tomography, X-Ray Computed

PURPOSE: Intraventricular neurocytoma, a recently recognized benign primary cerebral tumor of young adults, can be confused with oligodendroglioma and other neoplasms. The purpose of this paper is to describe the characteristic CT and MR imaging findings of intraventricular neurocytoma. MATERIALS AND METHODS: CT and MR imaging findings of five patients (M:F=2:3, ages 17-64, mean age 41) with intraventricular neurocytoma were retrospectively reviewed. All patients underwent CT scan and cerebral angiography. In four patients, MR imaging was performed and axial, sagittal, and coronal T1- and T2-weighted spin echo and gadolinium enhanced images were obtained. We evaluated the tumors with regard to location, size, shape, CT density, MR intensity, enhancement pattern, and internal texture such as calcification and cystic changes. RESULTS: All tumors were located in the lateral ventricles; especially around the foramen of monro (four cases). Their size varied from 1.0 x 1.5 cm to 4.0 x 3.0 cm and all showed a lobulated appearance. On precontrast CT scan, all tumors showed heterogeneous density due to multiple intratumoral calcifications and cystic changes. MR imaging showed a heterogeneous signal with iso- or slight hyperintensity on T1-weighted and hyperintensity on T2-weighted image, relative to cerebral parenchyme. After contrast injection, varying degrees of enhancement were noted on both CT and MR images. CONCLUSION: An intraventricular mass with or without calcification and cystic changes in the anterior portion of the lateral ventricle is suggestive of intraventricular neurocytoma. MR imaging is better in defining the exact location and cystic changes of the tumor, whereas CT is better for the characterization of calcifications.
Cerebral Angiography ; Cerebral Ventricles ; Gadolinium ; Humans ; Lateral Ventricles ; Magnetic Resonance Imaging* ; Neurocytoma* ; Oligodendroglioma ; Retrospective Studies ; Tomography, X-Ray Computed ; Young Adult

PURPOSE: To characterize MRI findings of central nervous system(CNS) granulocytic sarcoma (chloroma) and to analyse the points which differentiate it from other CNS tumors. MATERIALS AND METHODS: We evaluated MRI in six patients with CNS granulocytic sarcoma proven by surgery or bone marrow biopsy (intracranical, one case and spine five cases). A 0.5T superconductive MR machine was used for diagnosis and, axial, coronal and sagittal T1- and T2-weighted spin echo images and Gd-DTPA enhanced T1-weighted images were obtained. We retrospectively analized the location, signal intensity, margin, contrast enhancement and homogeneity, and bony change around the tumor. RESULTS: MRI findings of CNS granulocytic sarcomas were as follows : one tumor was seen to be an extra-axial mass in the posterior fossa of the brain, four were epidural, and one was an epidural and presacral masses in the spine ; tumor magins were lobulated and three were smooth. On T1-weighted images, all tumors were of isoignal intensity; on T2-weighted images, four were of isosignal intersity and two were of high signal intensity. Contrast enhancement was inhomogeneous in five of six cases. Bony change around the tumor was seen in two cases. CONCLUSION: On T1-weighted images, CNS granulocytic sarcomas (chloromas) were of isosignal intensity, relative to brain parenchyma or spinal cord ; on T2-weighted images, they were of iso or high signal intensity, with relative contrast enhancement. These points could be useful in differentiating them from other CNS tumors.
Biopsy ; Bone Marrow ; Brain ; Central Nervous System* ; Diagnosis ; Gadolinium DTPA ; Humans ; Magnetic Resonance Imaging* ; Retrospective Studies ; Sarcoma, Myeloid* ; Spinal Cord ; Spine

To investigate the an air pollution by particulate matter and its dispersion, a cement plant producing portland cement 600,000ton/year and its vicinity were surveyed from October, 1980 to April, 1983. The survey was mainly focused on main stack emission rate of the cement plant and particle size distribution in the dust, dustfall and total suspended particulate concentration in the area by month and distance from the stack. The results of the study were as follows; 1. The main stack emission rate was surveyed before and after the spray tower was additionally installed to the original E.P. and bag filter. Before the spray tower installed, the main stack emission rate was higher(0.64g/Nm3) than the emission standard of Korean Environmental Preservation Law's(0.5g/Nm3, amended to 0.4g/Nm3 on April 1983), but after the spray tower was installed, its main stack emission rate was markedly decreased to the standard (0.43g/Nm3). 2. 2~3 micrometer of the particle size was the largest portion(20.8%) of the dust particulate from the main stack and 50% of the frequency distribution was 1.5 micrometer of the size. Most particle size was below 10 micrometer. 3. The spray tower reduced the dustfall to 37.81~9.76ton/km2/month while dustfall appeared at 45.29-15.45ton/km2/month, in the vicinity of plant before spray tower installed. 4. Mean concentrations of total suspended particulate for 24 hours of the various stations were determined in 20.6-200.0 microgram/m3, 3 stations of them were higher than the value of Harry and William's arithmetic average standard 130 microgram/m3. 5. Linear regression between dustfall[X] and total suspended particulate[X] concentration was an equation, Y=4.024X+11.479.[r=0.91]. 6. During the whole seasons in the opposite area 100m apart from the emission source the prevailing wind direction was with estimated more than 30ton/km2/month, and the concentration of total suspended particulate for 24 hours averaging time was more than 140 microgram/m3 in the same area and direction. 7. Assuming the wind direction were constant through the day dustfalls for a day were estimated at 13.40ton/km2/day, 10.79ton/km2/day and 4.55ton/km2/day at various distances of 100m, 500m and 1,500m from the emission source respectively. 8. In the simutalion of dustfall and suspended dust by area, Gaussian dispersion model modified by size distribution of particulate matter was not applicated since the emission of dust were from multi sources other them stack. From the above results, it could be applied that the dispersion of dust from the cement plant is estimated and regulated for the purpose of environmental protection.
Air Pollution ; Natural Resources ; Dust ; Linear Models ; Particle Size ; Particulate Matter ; Plants* ; Seasons ; Wind

OBJECTIVE: This study is aimed to evaluate the efficacy of transnasal repair of cerebrospinal fluid(CSF) rhinorrhea. METHODS: Thirteen patients with traumatic noniatrogenic CSF fistulas were included in the retrospective analysis. High-resolution thin-section computed tomographic cisternography was helpful in localization of the CSF leakage site. The most frequent leakage site was the sphenoid sinus. The transnasal approach(TNA), comprised of endonasal endoscopic surgery(EES) or transseptosphenoidal surgery(TSS), was mainly used for smaller fistulas. Total or selected ethmoidectomy depended on the localization of the leakage. Wide sphenoidotomy enabled detection and repair of CSF leaks from the sphenoid cavity. Three patients also underwent transcranial approach(TCA) because of the large or multi-fragmented bony defect and the need for further exposure for repair. Five patients developed ascending meningitis in the preoperative period with antibiotic prophylaxis. RESULTS: Twenty-five leaks were initially repaired using one of three techniques:EES alone in eight patients, EES plus TCA in three, and TSS alone in two. Ten patients who solely underwent the TNA did not experience the complications of the traditional TCA. One recurrent sphenoid fistula was successfully treated by TSS. After a follow-up from 12 to 88 months(mean 32.7), the overall success rate for 25 CSF fistulas was 100%. CONCLUSION: The transnasal repair is a safe, successful, and alternative approach for the surgical repair of traumatic CSF rhinorrhea, and also could be combined to TCA.
Antibiotic Prophylaxis ; Cerebrospinal Fluid Rhinorrhea* ; Fistula ; Follow-Up Studies ; Humans ; Meningitis ; Preoperative Period ; Retrospective Studies ; Sphenoid Sinus

OBJECTIVE: To know the indications and logics of surgical and endovascualar treatment for patients with carotid stenosis. METHODS: The surgical indications and logics of symptomatic and asymptomatic carotid stenosis, and indication of angioplasty and stenting for carotid stenosis are discussed with the review of literatures. RESULTS: Carotid endarterectomy is indicated in patients with asymptomatic carotid artery stenosis of 60% or greater reduction in diameter and patients with symptomatic (recent transient ischemic attacks or nondisabling strokes) high-grade carotid stenosis (70 to 99%) with or without contralateral carotid stenosis or occlusion. The angioplasty and stenting for carotid stenosis may be indicated in patients who have the significant medical comorbidity, recurrent high-grade stenosis after endarterectomy, contralateral carotid occlusion, radiation induced stenosis, surgically difficult to access high-cervical stenosis and tandem lesion. CONCLUSION: Neurologists who have the primary management role for the cerebral ischemic patient in our country should be familiar with the surgical indications of carotid stenosis. They should try to find the patients who need the carotid endarterectomy and recommend them to surgeon to have the surgery. The cooperation among neurologist, neuroradiologist, vascular surgeon and neurosurgeon will improve the management results of patients with cerebral ischemic disease.
Angioplasty ; Carotid Stenosis ; Comorbidity ; Constriction, Pathologic ; Endarterectomy ; Endarterectomy, Carotid ; Humans ; Ischemic Attack, Transient ; Logic ; Stents ; Stroke*

OBJECTIVES: The goal of the surgical management of large and giant aneurysm is complete extirpation of the aneurysms with preservation or reconstruction of the parent artery. To improve the surgical management results of those aneurysms in the future, we review our experience and discuss technical maneuvers and strategies used to avoid potential complications of those aneurysm surgery. MATERIAL AND METHODS: During the past 12 years, thirty six cases of large and giant aneurysms(diameter>19mm) were managed by surgery. The clinical characteristics, treatment methods, surgical complications and outcome of those cases were analyzed and, based on the review of the literatures, the preventive methods of surgical complication related to the clipping of those aneurysms were discussed. RESULTS: The locations of those aneurysms were anterior circulation in 34 cases and posterior circulation in 2 cases. The most frequent site of aneurysmal location was a paraclinoidal region of the anterior circulation. The aneurysms were managed surgically by direct clipping of aneurysmal neck in 31 cases, aneurysmal trapping followed by extracranial-intracranial bypass in 2 cases, proximal clipping of parent artery, aneurysmorrhaphy, and excision of aneurysm followed by end to end anastomosis of parent artery in each one case. Surgical complications occurred in 13 cases. A parent vessel occlusion by thrombus formation and parent vessel stenosis after clipping of aneurysm were the main complications. We obtained good outcome in 27, fair 5, poor 1 and dead in 3 case(s). CONCLUSION: We conclude that selection of suitable management method for each case, high quality of surgical technique and prevention of complication during operation are important key points for the successful treatment of large and giant aneurysm. The heparinization prior to application of temporary clip on parent vessels, aneurysmal decompression during dissection and clipping of aneurysm, complete closing of the aneurysmal neck and avoiding the narrowing of parent vessel after clipping of aneurysm were the main technical maneuvers used to avoid complications of those aneurysm surgery.
Aneurysm* ; Arteries ; Constriction, Pathologic ; Decompression ; Heparin ; Humans ; Intracranial Aneurysm ; Neck ; Parents ; Thromboembolism ; Thrombosis

OBJECTIVE: Although most of hypertensive intracerebral hematoma (HICH) are static after ictus, a minority of them can enlarge in the acute phase after onset. This study performs to find the predicting factors and signs of hematoma enlargement in patients with HICH. METHODS: Among 140 cases of HICH treated during 1.5 years, the authors selected 107 cases who underwent contrast enhanced and nonenhanced initial CT scanning within 12 hours after symptom onset and a follow-up CT scan in order to investigate the enlargement of hematoma. Those cases were divided into two groups:hematoma enlargement (group I) and non-enlargement group (group II). The comparison of predicting factors (bleeding tendency, abnormal liver function and blood pressure) and signs (enhanced focus in hematoma on CT) of hematoma enlargement between group I and II was performed. RESULTS: There were 8 cases in group I and 99 cases in group II. The incidence of an enhanced focus in hematoma on CT scan was higher in group I than group II (87.5% vs. 9.1%, p<0.05). The systolic blood pressure (BP) at 6 hours after symptom onset and at the time of the first CT scan was higher in group I than group II (172.5 vs. 152.0 mm Hg, and 182.5 vs. 158.6 mm Hg, respectively, p<0.05). There was no difference in the incidence of bleeding tendency and abnormal liver function between group I and II. CONCLUSION: Contrast enhanced brain CT scan to detect the enhanced focus in the hematoma is one of useful methods to predict the early enlargement of hematoma in patients with HICH. The continuance of a high BP in spite of medication of antihypertensive drugs during the acute period after the onset of symptoms is another predictive sign of hematoma enlargement in patients with HICH.
Antihypertensive Agents ; Blood Pressure ; Brain ; Follow-Up Studies ; Hematoma* ; Hemorrhage ; Humans ; Incidence ; Liver ; Tomography, X-Ray Computed*

No abstract available.
Carpal Tunnel Syndrome*