With regard to various pathologic conditions, it is important to understand not only MR findings, which dependon the anatomic location of intraventricular lesions, but also the anatomic location most appropriate for surgicalintervention. In this paper we will analyze and demonstrate the incidence and characteristic MR findings ofvarious intraventricular tumors according to the location of ventricles.
Incidence

No abstract available.
Incidence*

The incidence of congenital unilateral renal hypoplasia is extremely rare.Two cases of congenital unilateral renal hypoplasia were presented with review of literature.
Incidence

Fifty three surgically resected gallbladders(49 cases of chronic cholecystitis with or without cholelithiasis, 4 cases of incidentally resected gallbladders) and 14 autopsy cases were subjected to the histotopographic analysis to identify the nature and distribution of metaplastic mucosal changes, and to determine the possible histogenesis of these mucosal lesions and diagnostic implication as a parameter of chronic cholecystitis. 1) Antral type glands were demonstrated in 47(88.7%), goblet cells in 19(35.8%) and surface epithelial changes in 27(50.9%) of total surgical specimens, indicating the benign metaplastic changes of the gallbladder mucosa toward the gastric or intestinal type. 2) Topographic distribution illustrated the extension of antral type gland to the middle and upper one third portions of the gallbladder mucosa in 37 cases, each. Goblet cells in the middle and upper one third of the mucosa were demonstrable in 13 cases(68%) an 8 cases(42%), respectively. 3) Average age by degree of extension was 50.0 years in Grade O-I, 50.1 years in Grade II and 56.4 years in Grade III. 4) Among 53 surgically resected gallbladders, gallstone was found in 31 cases, in which was a significant correlation between the distribution of metaplastic changes by degree of extent and cholelithiasis. 5) There was no statistical significance between incidence of metaplastic changes of the gallbladder and degree of inflammatory reaction by means of chronic and/or acute inflammatory cell infiltration and Rokitansky-Aschoff sinus formation. 6) Only two out of fourteen autopsy cases demonstrated focal and spotty presence of goblect cells. It is of authors assumption that the lining epithelium of the gallbladder undergos various types of metaplastic changes in the diseased conditions, in which cholelithiasis is included as one of preceding factor. And also, the diagnostic implication of epithelial metaplasia as an expression of chronic cholecystitis is discussed.
Incidence

The purpose of this study was to elucidate the epidemiology and the clinical characteristics of herpes zoster and chicken pox. 703 patients with herpes zoster and 237 patients with chicken pox who were seen at the Department of Dermatology, St. Marys Hospital during 8 years were taken for this retrospective study. Both groups of the patients were evaluated in regard to annual, seasonal and monthly incidence, age incidence and sex ratio. Patients with herpes zoster were further assessed concerning associated conditions, dermatomic distributions and complications. The results were as follows, 1. The annual rate for chicken pox ranged from 0.03% to 0.18% (mean 0.13%) and revealed no epidemics, however, its incidence was higher in early summer and winter. There was no sexual difference. Chicken pox was seen most. frequently in the 0-9 year age group (91.1%). 2. The annual rate for herpes zoster ranged from 0.23% to 0.52% (mean 0.38%). There were no significant annual, seasonal and monthly variations, and there was a. equal sex ratio. Herpes zoster was seen most frequently in the 50-59 year age group (19.1%) 3. The frequencies of the associated conditions in herpes zoster, in descending order, were infectious disease (2. 7%), diabetes mellitus (2.3%), malignant neoplasm(1. 4%), immunosuppressive drug (l. 4%), autoimmune disease (0.6%), and radiation therapy (0.4%). 4. The dermatomic involvement of herpes zoster was most frequent on thoracic dermatome (53.5%) and others were cervical (16.5%), lumber (10.1%), ophthalmic branch of trigeminal nerve (8.8%), sacral (1.6%), maxillary branch of trigemenal nerve (1.3%), mandibular branch of trigemical nerve (0.6%) and facial nerve dermatome (0.1%). The incidence of involving two different dermatomes was 2.9% and was most common on cervicothoracic dermatome (1.8%). However, one case of cervico thoracic dermatome showed bilateral involvement. 5. The most common complication of herpes zoster was postherpetic neuralgia (6.5%) and others were secondary bacterial infection (2.6%), keratoconjunctivitis (0.6%), keloid formation (0.3%), generalized varicelliform eruption (0.1%), Ramsay-Hunt syndrome (0.1%) and recurrent herpes zoster (0.1%). The mean age of incidence for postherpetic neuralgia was 58.4 years and its incidence was the highest over 70 years (39.5%). Postherpetic neuralgia was most frequently seen in the involvement of ophtalmic branch of trigeminal nerve.
Incidence

The statistics of 40,611 new cases of skin diseases seen in Dermatologic department of Chonnam University Hospital from 1971 to 1980 are analysed and significant changes in incidence of the 25 most common dermatoses are discussed in detail and the results are comared with other surveys. The results of this study are summed up in 4 tables. Table 1. Shows the annual frequency of the 25 most common dermatoses. Table 2. Shows the frequency of the 25 most common dermatoses by age group. Table 3. Shows the frequency of the 25 most common derrnatoses by season, sex and region. Table 4. Shows the comparison of frequency of the 20 most common dermatoses with other reports.
Incidence

It is necessary to have accurate statistical data of disease for planning and evaluating public health policy as well as assessing population health index. The national health insurance data is the only data to assess incidence of diseases nation-wide. However, inaccuracy of the data pose serious limitations of use of the data. The Medical Record Departments of individual health facilities have used discharge summary information for hospital management and clinical research, but a nation-wide integrated database of diseases has not been setup and utilized. We applied previously developed Korean Uniform Hospital Discharge Data Sets to collect discha rge summary data from health care facilities and establish integrated database. We also made the question and answer column about disease of the database in the internet. We collected patient discharge data from a tertiary-care hospital for one year using the electronic discharge summary data collection system, except for health care costs. The internet querying system provided optional selection of columns or rows, individual and/or disease groups and surgical procedures. To make query easy, the system provided various functions like querying codes of diseases and/or surgical operations, reviewing questions, downloading results via excel files, help functions of query. The establishment of disease database and the interactive system through internet is in its inception, further studies may be necessary to make it a user friendly and accurate system. There is a need of an accurate assessment of current population-based health status and future trends in Korea. It is hoped that this study may trigger to establish national accurate database for enhancing studies of health policy making, clinical research and vital health statistics by expanding data collections to the se condary- care and primary- care institutions.
Incidence

Of 14,682 samples of feces examined, 81.7% were positive for intestinal helminths. Trichocephalus trichiurus was observed most frequently, in 73.2%. Eight other species of helminths found were Ascaris lumbricoides, Hookworm, Trichostrongylus orientalis, Clonorchis sinensis, Tapeworm, Hymenolepis nana, Paragoniumus westermani and Enterobius vermicularis, listed in decreasing order. Double infections were found more frequently than single infections, and mixed infection of five or more species of helminths occurred in 0.2% Of 10,320 samples of feces examined, 22.3% were positive for intestinal protozoa, Entamoeba coli was observed most frequently, in 11.1%. Six other species, Endolimax nana, Giardia lamblia, Entamoeba histolytica, Iodamoeba butschlii, Chilomastix mesnill and lsospora hominis were found, in the order. It was noticed that E. histolytica was found more frequently in trichurial infection than with other helminths. Of 1,050 samples of sputum from the T. B. Clinic, 7.0% were positive for paragonimus eggs. Trichomonas vaginalis were found in 35.8%of 1,146 vaginal swabs examined. Seven cases of Plasmodium vivax infection were found among 140 suspected blood smears.
Incidence

In Korea chronic liver diseases are the important medical issues because of their high incidence, poor prognosis and no available therapeutic resume. It is believed that the etiologic agent of most of chronic liver diseases in Korea is hepatitis B virus. To find out the incidence of positivity and to understand the autoantibodies in some of the chronic liver diseases in Korea, anti-smooth muscle antibody and anti-nuclear antibody tests were performed on 43 patient serum with chronic active hepatitis, 13 patient serum with chronic persistant hepatitis and 20 patient serum with liver cirrhosis, who diagnosed by liver biopsies. The results of the study are summarized as follows: 1) The positivity of anti-smooth muscle antibody in chronic active hepatitis was 93.0%, that in chronic persistant hepatitis 60.0% and that in liver cirrhosis 80.0%. 2) The positivity of anti-nuclear antibody in chronic active hepatitis was 18.6%, that in chronic persistant hepatitis 15.4%, that in liver cirrhosis 5.0%. 3) The test efficiency of anti-smooth muscle antibody to differentiate chronic active hepatitis from chronic persistant hepatitis and liver cirrhosis was 48.7%. The above results suggest that the antismooth muscle antibody may be related to the "necrosis of liver cells", and further studies are needed to fine out any relationship between the autoantibody and the disturbance of immune regulatory function if there is, as this study suggested.
Incidence

Optic nerve gliomas manifest either as a solitary form or a component of von Recklinghausen's neurofibromatosis. The reported incidence of coexistence with neurofibromatosis varies from 12% to 70%. Usually there are no significant cytological differences between the gliomas that accomapny the disease and those that are deemed to be solitary manifestations. The only possible difference between them is the apparently more common association, with the former, of extensive arachnoid hyperplasia and of a more florid local gliomatous infiltration into the leptomeninges, altogether resulting in perineural thickening. Our cases were 8 and 6 years old girls, respectively, presented with slowly progressive proptosis for 4 years and visual disturbance for 2.5 months. There were multiple cafe au lait spots on their trunks, and case 2 showed Lisch nodules in the iris. MRI of brain revealed unilateral optic nerve thickening with involvement of chiasm or multiple intracranial lesions. Resection of optic nerve tumor was performed. Microscopically, variable degree of tumorous change was seen. Most typically enlarged area was composed of intraneural and perineural portions surrounded by a layer of intact dura. Intraneural tumor revealed proliferation of elongated, spindle-shaped pilocytic astrocytes in intertrabecular spaces and distention of the pial septa with fibrovascular thickening. Another segment had areas with reactive gliosis. Perineural tissue was considerably thickened and, associated with proliferation of meningothelial cells and fibroblasts intermingled with astrocytes and Rosenthal fibers. There were increase of the optic nerve diameter and distention of the overlying dura. Foci of arachnoid cell hyperplasia were noted in both cases, although differed in degree. Immunohistochemically, the tumor cells expressed glial fibrillary acidic protein in intraneural and perineural portions particularly in case 2.
Incidence