No abstract available.
Facial Bones*

No abstract available.
Adult* ; Humans

PURPOSE: Magnetization transfer imaging(MTI) is a new imaging contrast technique. Our MT pulse sequence is designed as fixed time interval between echo and MT pulse. This study was peformed to evaluate the influence of variations in TR/TE on MTR in T1 weighted image of normal brain tissue on this kind of MT pulse sequence. MATERIALS AND METHODS: Seven healthy volunteers in twenties of age as the objectives, MRI was taken under various TR/TE(TR/TE ;700/14, 650/14, 750/14, 700/20 and 1500/20 msec). MTR was calculated from signal intensities measured at the same point in both pre and post MT images and statisticslly analyzed. The MR imager used in this study was 1.0T Magnetom 42SP(Siemens, Erlangen, Germany) and the parameters of additional MT pulse sequence were offset 1000Hz and bandwidth 250Hz, and posteriorly located to echo with 7.7 msec fixed interval. Offset of this MT pulse was variable. RESULT: In white matter of brain tissue from a normal person, MTR was 34-39%(average 37%) for TR and TE of 700/14 in T1WI and 33-36%(average 35%) for TR/TE of 650/14, and 34-38%(average 35%) for TR/TE of 750/14 which showed no statistical difference. However, in case of 1500/20 of TR/TE, MTR was 26-28%(average 26%) which is statistically significant. With TR/TE of 700/14 as the standrd value, the MTR of gray and white matter were 37% and 29% respectively, showing a definite difference of statistical means. Signal from CSF in ventricles is rarely influenced by MT pulse. CONCLUSION: Conclusively, a subtle variation in TR/TE in T1WI has little influence on MTR but wide range of variation in TR/TE as in proton density image induces significant difference in MTR on this kind of MT pulse sequence. Therefore, the exchangeable usage of MTR data would be possible in narrow range of TR/TE change but difficult in wide range of variation.
Brain* ; Healthy Volunteers ; Humans ; Magnetic Resonance Imaging ; Protons ; Reference Values*

PURPOSE: To obtain magnetization transfer ratio(MTR) of the annulus fibrosus and nucleus pulposus and to assess the feasibility of utilizing the changes of these MTRs as an early indicator of disk degeneration. MATERIALS AND METHODS: MR images of lumbar spine with magnetization transfer(MT) technique in 42 patients were obtained. spin echo techniques (600/14) with same TR/TE with 1KHz off-resonance saturation were employed in 1.0T MR system. MTRs were calculated in two regions, anterior annulus fibrosus and nucleus pulposus, and the results were compared between the normal and degenerative disks, from grade I to IV, on T2-weighted images. RESULTS: MTRs of the nucleus pulposus were 17.6% in the normal disks, and 26.7%, 28.4%, 29.1%, 29.7% in degenerative disks, from grade I to IV, respectively, with a significant difference(P<0.05). On the other hand, MTRs in the annulus fibrosus were 30.2% in the normal disks and 31.5%, 33.2%, 32.1% and 35.6% in degenerative disks, from grade I to IV, respectively, without significant difference. CONCLUSION: Since MTRs are significantly higher in degenerative nucleus pulposus than those of the normal disks, increased MTRs in the nucleus pulposus can be used as an early sign of the degeneration of the nucleus pulposus.
Hand ; Humans ; Intervertebral Disc Degeneration* ; Magnetic Resonance Imaging* ; Spine

No abstract available.
Animals ; Carcinoma, Hepatocellular* ; Mice*

Disseminated superficial actinic porokeratosis (DSAP) has an autosomal dominant mode of inheritance with reduced penetration at young age, characterized by multiple superficial keratotic lesions surrounded by a slightly raised border. The aggrevation of the lesion by exposing UV light indicates that phenotypic expression of gene regluating DSAP is related to sun light. We observed a family of which 13 members had DSAP in 3 successive generations. They were grandrnother, two sons of her 3 offsprings, 2 grandsons and 8 granddaughters. Lesions of all cases were found on the sun exposed areas, especially, face, extremities and upper trunk but exceptionally one had a lesion on the unex posed area, abdomen below the iliac crest. The number of lesions of the individual patient were 12-116, and there appeared to be increasing number of lesions with age.
Abdomen ; Extremities ; Family Characteristics* ; Humans ; Porokeratosis* ; Solar System ; Ultraviolet Rays ; Wills

The statistical study of new outpatients of skin problems seen in dermatologic department of Seoul Red Cross Hospital from l976 to 1980 was done and the 10 most common dermatoses were analysed in detail, The results were summarized as follows: 1) Of 19,679 outpatients, males were 10,530(53.5%) and females were 9,149(46.5%). The sex ratio of male to female was 1. 15: l. 2) The most common dermatoses were atopic dermatitis/eczema(16. 9%), fungal infection(16. 2%), contact dermatitis(15. 3%), scabies(10. 7%), urticaria(10. 6%), acne(9. 5%), pyoderma(8. 3%), insect bite(5. 6%), syphilis(4. 1%) and psoriasia (2. 8%). 3) Of 10 most common dermatoses, contact dermatitis, acne, scabies and urticaria were revealed to have a tendency to increase year by year, syphilis and psoriasis were constant pattern and other common dermatoses showed irregular pattern in their incidence. 4) The sex ratio of male to female of l0 most common dermatoses was l. 23: l. Fungal infection, scabies, pyoderma, insect bite, syphilis and psoriasis wereoutnumbered in male and atopic dermatitis/eczema, contact dermatitis, urticaria and acne were outnumbered in female. 5) Atopic dermatitis/eczema & scabies were prevalent in winter, acne, fungal infection, urticaria and pyoderma in summer, and contact dermatitis in spring and summer. 6) The most frequent age groups of atopic dermatitis/eczema were 1 to 10 years, acne and fungal infection, 11 to 30 years, and contact dermatitis and fungal infection, 31 to 50 years.
Acne Vulgaris ; Dermatitis, Contact ; Female ; Humans ; Incidence ; Insect Bites and Stings ; Insects ; Male ; Outpatients* ; Psoriasis ; Pyoderma ; Red Cross ; Scabies ; Seoul ; Sex Ratio ; Skin ; Skin Diseases ; Statistics as Topic* ; Syphilis ; Urticaria

PURPOSE: Pilocytic astrocytoma is a benign tumor predominantly arising from cerebellum in pediatric age. But it occasionally arises in supratentorium. We describe radiologic findings of supratentorial pilocytic astrocytoma. MATERIALS AND METHODS: Eleven CT and 7 MR examinations in 11 patients were retrospectively reviewed with attention to location, CT density, MR signal intensity, and degree and pattern of contrast enhancement on CT and MR. RESULTS: The tumors were located around the third ventricle (hypothalamus in three cases, optic chiasm in three cases) and in cerebral hemisphere (temporal lobe in three cases, frontal lobe in one case, thalamus in one case). On CT, the tumors were all sharply demarcated and rarely associated with edema. The tumors showed moderate to strong contrast enhancement. Necrosis appeared frequently in tumors around the third ventricle in contrast to frequent cyst formation in hemispheric masses. On MR, the tumors appeared hypo- or isointense on T1- weighted images and hyperintense on T2- weighted images. After administration of contrast agent, the tumors showed intense enhancement more than that of CT. CONCLUSION: The typical location and radiologic findings described above are helpful in the diagnosis of the supratentorial pilocytic astrocytoma.
Astrocytoma* ; Cerebellum ; Cerebrum ; Diagnosis ; Edema ; Frontal Lobe ; Humans ; Necrosis ; Optic Chiasm ; Retrospective Studies ; Thalamus ; Third Ventricle

We present a case of impetigo herpetiformis occurring in a 20-year-old primigravida who developed severe cutsneous lesion which was characterized by groups of small, sterile pustules on an inflamed base and was associated with fever, chill, and malaise. Histopathologic findings showed acute inflammatory reaction with spongiform pustule of Kogoj in the upper epidermis and microabscess within the horny layer, Antibiotics and steroids treatment even aggravated the disease. After delivery, she was given oral retinoid(Tigason ), and consequently the skin lesions cleared in (i weeks.
Anti-Bacterial Agents ; Epidermis ; Fever ; Humans ; Impetigo* ; Skin ; Steroids ; Young Adult

BACKGROUND: Chronic cutaneous lupus erythematosus(CCLE) is a well-known disease entity. But there has been no data about its clinical behavior and histopathologic features in Korea. OBJECTIVES: This study was conducted to elucidate the clinical, laboratory, and histopathologic features of CCLE, and the relationship between CCLE and SLE. MATERIALS AND METHODS: We investigated 48 cases of CCLE that visited the department of dermatology at the Seoul National University Hospital from January 1990 to June 1997. Medical records and biopsy slides were reviewed.
Biopsy ; Dermatology ; Korea ; Lupus Erythematosus, Cutaneous* ; Medical Records ; Seoul