Thirty-five cerebello-pontine angle lesions were diagnosed with simple skull X-ray, CT, and angiography atSeoul National University Hospital from Sept. 1978 through Aug. 1982. The radiographic findings were analysed withemphasis on the differential points of CT among the major three cerebello-pontine angle tumors; acousticneurinoma, meningioma and epidermoid. The results are as follows; 1. Among the 35 cases of cerebello-pontine anglelesions, 19 cases were acoustic neurinoma. 4 cases miningioma, 4 cases epidermoid, 2 cases metastasis, 1 caseschoroid plexus papilloma, 1 case arteriovenous malformation, and 3 cases intra-axial posterior fossa tumors. 2.The characteristic radiographic findings of acoustic neurinoma were windening of internal auditory canal, petrousbone erosion, posterior extension of tumor at the level of internal autidory canal, hypo or isodense mass onpre-contrast CT with high enhancement after intravenous contrast infusion, and cystic change within the mass. 3.Meningioma shows anterior extenstion of the lesion at the level of internal auditory canal, broad base and obtuseangle sign of the lesion with petrous bone, hyperdense mass on precontrast CT. with highly homogeneous enhancementafter intravenous contrast infusion. 4. Epidermoid characteristically shows hypodense mass on precontrast CT withno change after intravenous contrast infusion. 5. The differential points of the major 3 cerebello-pontine tumorswere bone change, mass location, attenuation , degree of attachment to petrous bone, and cystic change.
Angiography ; Arteriovenous Malformations ; Infratentorial Neoplasms ; Meningioma ; Neoplasm Metastasis ; Neuroma, Acoustic ; Papilloma ; Petrous Bone ; Skull

Masson's hemangioma is a rare benign vascualr condition with a papillary intravascular endothelial proliferation which may appear either as aprimary form or as a secondary form in a pre-existing vascular process.CT and angiographic features of 2 cases with Masson's hemangioma were presented. Both of them were locatedextra-axially in the posterior fossa. CT findings were not specific in both cases: One showed homogeneously enhancing mass, simulating meningioma. And the other demonstrated a multiolocular rim enhancing mass. However, the angiographic features were rather characteristic; Both cases showed persistent vascular poolings of contrast mediawhich were supplied form the meningeal vessels. Angiographic differential diagnosis of similar lesions in theposterior fossa is discussed.
Diagnosis, Differential ; Hemangioma ; Meningioma

Epidermoid cysts occur rarely on the palms and soles, where hair is not present. These cysts have long been assumed to arise from traumatic implantation of epidermal fragment, but the pathogenesis is still controversial. Recently, with microscopic findings, immunohistochemical features, and molecular studies, the epidermoid cysts of the sole may be induced by the human papillomavirus. We report two cases of epidermoid cysts of the sole with the discussion of the pathogenesis.
Epidermal Cyst* ; Hair ; Humans*

No abstract available.
Neuroectodermal Tumors, Primitive*

To investigate the nature of artifacts caused by air and chemical shift by fat, a test tube phantom study was performed in 2.0T and 0.5T superconducting magnetic resonance imaging systems in various imaging sequences. Spatial mismapping and signal change made image distortion in spin echo images of the air-column and severe signal voids in gradient echo images. Chemical shift artifacts appeared in the planes of frequency-encoding axis as crescent-shaped signal voids and summated bright signals, Both artifacts were more prominent in high field strength, Images at 0.5T showed more severe artifacts in the T2-weighted images than those in the other sequences. As the acquisition matrix increased, truncation artifacts decreased and susceptibility artifacts in gradient echo images diminished. Familiarity with causes, appearances and mechanisms of various artifacts will help radiologists for interpretation of MRI.
Artifacts* ; Magnetic Resonance Imaging* ; Recognition (Psychology)

PURPOSE: To analyze contrast-enhancement pattern of stomach cancer on dynamic MRI and to verify the efficacy of intravenous contrast agent in the evaluation of stomach cancer. MATERIALS AND METHODS: Twelve patients with proven stomach cancer underwent dynamic MRI, By using 1.0T scanner, we obtained precontrast FLASH images, and 30, 60, 90 second delay FLASH images after intravenous contrast injection. All patients ingested on liter of water and had intramuscluar injection of Buscopan just before MR study. For quantitative analysis we measured signal to noise ratio (S/N) of stomach cancer on each image, and signal difference to noise ratio (SD/N) between cancer and intraluminal fluid, cancer and the pancreas. For qualitative analysis two radiologists evaluated lesion conspicuity on each image by grading system(grade 0, 1, 2, 3: poor, fair, good, excellent). RESULTS: S/N of stomach cancer increased gradually by time(precontrast, 30, 60, 90 second delay:38.7, 42.5, 57.4, 65.7). SD/N between cancer and intraluminal fluid significantly increased after contrast enhancement(1.24, 25.01, 39.30, 45.89). SD/Ns between cancer and the pancreas were 10.5, 9.33, 9.99, 10.66 respectively. In qualitative analysis, precontrast images were better than postcontrast images for delineation of stomach cancer, Postcontrast images showed clear endo-luminal side of stomach cancer, but outer margin of stomach cancer was more distinct on precontrast images. CONCLUSION: Precontrast MR images are better than postcontrast MR images in the depiction of stomach cancer. Intravenous contrast agent is not imperative in the evaluation of stomach cancer.
Butylscopolammonium Bromide ; Humans ; Magnetic Resonance Imaging* ; Noise ; Pancreas ; Signal-To-Noise Ratio ; Stomach Neoplasms* ; Water

Authority estimated the concentration of fluorescein sodium in the blood, anterior chamber and vitreous after injection of 10% fluorescein sodium, 25mg/kg, according to the lapse of time. Also intravitreal fluorescein sodium concentration was measured after intravitreal injection of 0.1 % fluorescein sodium 10 micro liter according to the lapse of time. The results were as follows. 1. In the normal rabbits, the concentration of fluorescein sodium in the anterior chamber and vitreous were 159.3 +/- 101.7 X 10(-9) gm/ml and 3.6 +/- 4.7 X 10(-9) gm/ml, respectively after 1 hour of fluorescein sodium intravenous injection. The Cv/Ca was 0.02 +/- 0.028(Cv: concentration of fluorescein in the vitreous) (Ca: concentration of fluorescein in the ant. chamber). 2. After injection of sodium fluorescein in the normal rabbit, the concentration of fluorescein in the blood showed rapid decrease in logarithmic manner in the vitreous, the concentration peaked 1 hour and 2 hours after injection which persisted several hours. 3. The concentration of fluorescein sodium in the vitreous after intravitreal injection of fluorescein decreased at logarithmic rate which disappeared 24 hours after injection.
Anterior Chamber ; Ants ; Fluorescein* ; Injections, Intravenous ; Intravitreal Injections ; Pharmacokinetics* ; Rabbits

CT has becom increasingly important diagnostic method as the inital examination in the diagnosis of subarachnoid hemorrhage with direct detection of extravasated blood inbasal cistern and cortical sulci. Furthermore, CT provides better and exact visualization of the presence, localization, extent and degree of intracerebral, intraventricular and subdural hemorrhage, infarction, hydrocephalus and rebleeding which may be associated wtih subarachnoid hemorrhage, and also could detect the causative lesions with contrast enhancement inmany cases. The purpose of the paper is to describe the CT findings of subarachonid hemorrhage due to various causes and to evalute the diagnostic accuracy of CT in subarachonoid hemorrhage. Authors analysed a total of 153 cases with subarachnoid hemorrhage confirmed by lumbar puncture at Seoul National University Hospital from March 1979 to April 1981, with special emphasis on CT findings.All of the cases took CT scan and 125 cases of the mangiography. The results are as follows; 1. Most prevalent age group was 4th to 6th decades (78%). The ratio ofmale to female was 1.1:1. 2. Of all 125 with angiography, aneurysm was a major cause (68%). Others were arterio-venous malformation (9.6%), Moya-moya disease(4%) and unknown (18.4%). 3. Of all 153 cases with CT scan,hemorrhage was demonstrated in 98 cases (64.1%); SAH in 72 cases (47.1%), ICH in 65 cases (42.5%), IVH in 34 cases(22.2%) and SDH in 1 case(0.7%). SAH combined with ICH was a major group (34.7%) in SAH. Detecton rate of SAH was68.3% within the first 7 days and 5.8% after 7 days. 4. In aneurysms, SAH was detected in 60 of 85 cases (70.6%);88.1% within the first 7 days and 5.6% after 7 days. Anterior communicating artery was the most common site of theaneurysms(40%), in which detection rate of SAH was 100% within the first 7 days. SAH was combined with ICH in38.3%. 5. On CT, SAH of unilateral Sylvian fissure was pathognomonic for ruptured MCA aneurysm and ICH of corpuscallosum for ACA aneurysm. 6. The detection rate of aneurysm itself on CT was 20%(17/85) and its size was variablefrom 5 to 25mm. 7. Infarction was demonstrated in 9 cases (6%) and there was no significant correlation between infarction and angiospasm, 8. Hydrocephalus was detected in 65% cases(42.5%), and 21 cases (32.3%) were demonstrated within the first 3 days.
Aneurysm ; Angiography ; Arteries ; Diagnosis ; Female ; Hematoma, Subdural ; Hemorrhage ; Humans ; Hydrocephalus ; Infarction ; Methods ; Seoul ; Spinal Puncture ; Subarachnoid Hemorrhage ; Tomography, X-Ray Computed

Renal infarction with ethanol was induced exprimentally in rabbits and selective renal angiography wasperformed to evaluate the effectiveness of ethanol as embolic material. The results were as follows; 1. Completeobstruction of renal artery was produced in all cases within 1 week after injection of absolute ethanol(0.5ml/kg). 2. Incomplete obstruction of renal artery was produced in majority after injection of absolute ethanol(0.2ml/kg) and changed to complete obstruction above half cases with time. 3. Incomplete obstruction of renalartery was produced in minority after injection of 60% ethanol (0.2ml/kg) and complete obstruction of renal arterywas not produced. It was considered that ethanol is an effective agent for complete renal infarction and 0.2 to0,5ml/kg of absolute ethanol is effective dose for complete renal infarction.
Angiography ; Ethanol ; Infarction ; Rabbits ; Renal Artery

Cysticercosis, like other parasitic disease, is still endemic in many parts of the world, and is not infrequently found in Korea. The authors reviewed CT findings of 54 cases of the cysticercosis involving the centralnervous system which were proven by pathology and clinical findings. The resuls are as follows; 1. Male to femaleratio is 3:1 and the most prevalent age group is the fifth decade. The most common symptom is seizure(56%). 2.Involved areas in the brain are parenchymal (66%), intraventricular (15%), leptomeningeal (40%) and the mixed(15%). 3. Pre-contrast CT findings are the round low density in 46 cases (85%), multiple pin-point calcificationin 18 cases (33%), variable degrees of hydrocephalus in 20 cases (37%) and peripheral edmatous change in 8 cases(15%). 4. Post
Brain ; Cysticercosis ; Humans ; Hydrocephalus ; Korea ; Male ; Parasitic Diseases ; Pathology