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BACKGROUND A pituitary incidentaloma is a pituitary mass discovered incidentally by computed tomography (CT) or magnetic resonance (MRI) of the brain performed for evaluation of an unrelated disease, and when the patient did not show neurological or endocrine signs and symptoms. Despite of increasing incidence, only a few studies have reported on characteristics, natural history, treatment, or follow-up strategy. Moreover no epidemiologic data exist on pituitary incidentaloma in Korean. METHODS: We retrospectively enrolled subjects diagnosed as pituitary incidentaloma in Seoul National University Hospital from January 1992 to August 2006. We reviewed baseline demographic findings and the results of basal hormone tests, visual field test, and MRI (or CT) at baseline and during follow-up. RESULTS: Among 1310 patients with pituitary adenoma, 161 subjects were diagnosed with incidentaloma. The subject age at diagnosis was 49.7 +/- 15.5 years, with 84 males. Macroadenoma was more frequent (n = 110, 68.3%). with microadenomas and Rathke's cleft cysts found in 21 and 30 cases, respectively. The mean diameter of the tumor was 1.75 cm. Functional incidentalomas such as prolactinoma or acromegaly were found in 31 cases (19.3%) although there were no symptoms or visual field defects. Of 61 incidentaloma patients who did not undergo surgery or other treatment over one year, only 3 patient showed an increase in tumor size during the mean 38.0 +/- 24.9 months follow-up. CONCLUSION: Pituitary incidentaloma generally showed a benign course despite the high prevalence of macroadenoma (68.3%). However, as about 20% of the patients had functioning tumors, pituitary hormonal evaluation at diagnosis is mandatory. Furthermore, as we experienced 3 cases with increased tumor size during follow up, including a case of pituitary microadenoma, long-term careful follow-up of pituitary incidentaloma seems necessary. A long-term, prospective study with more patients would reveal the characteristics and the natural history of pituitary incidentalomas in Korea.
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BACKGROUND Thyrotoxic periodic paralysis (TPP) occurs mostly in males, but no studies have addressed the role of androgen in the disease. Hyperinsulinemia can precipitate acute paralysis in TPP patients. CAG repeats in the androgen receptor (AR), an X-linked gene, correlate with serum insulin levels. AIM: To evaluate whether CAG repeats in the AR gene might predict the susceptibility to TPP in Korean male Graves' patients. METHODS: We evaluated CAG repeat length in a series of 33 male TPP patients and 48 control patients by direct sequencing of the PCR product of the AR promoter site. Control patients were male Graves' patients without a history of paralysis. RESULTS: The CAG repeat length varied from 15 to 34 (median of 23). The upper quartile of CAG length was equal to or above 26 repeats (long AR). The distribution of long AR was 0.30 in TPP and 0.15 in control patients, respectively (odds ratio, 2.51; 95% confidence interval, 0.92~6.85; P = 0.09). CONCLUSION: AR gene polymorphisms may not confer genetic susceptibility to TPP in Korean male patients with Graves' disease.
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BACKGROUND Cigarette smoking has a significant impact on thyroid function. However, the association between smoking and thyroid function is incompletely understood. METHODS: We conducted a cross-sectional study that included 90,970 adults (age range: 20 to 79) who had visited the health promotion center at Asan Medical Center between January 1, 2001, and December 31, 2003. Those subjects with previous known thyroid disease, a history of thyroid operation, a history of thyroid function altering medication (herb, estrogen or digestive) or a family history of thyroid disease were excluded. Finally, 47,577 subjects (males: 30,726, females: 16,851) were included in this study. We calculated the age-adjusted geometric mean of the serum TSH and the age-adjusted mean of the serum free T4 among the current, former and never smokers. We also analyzed the age-adjusted prevalence of hypothyroidism and hyperthyroidism among each group. RESULTS: Among men, the geometric mean TSH level was significantly low in the current (1.40 mIU/L, 95% confidence interval [CI]: 1.38-1.41) and former smokers (1.59 mIU/L, 95% CI: 1.57-1.61) compared with the never smokers (1.65 mIU/L, 95% CI: 1.63-1.68). The mean free T4 level was high in the current smokers (1.236 ng/dL, 95% CI: 1.234-1.239) compared with the never smokers (1.234 ng/dL, 95% CI: 1.230-1.238). Similarly, among women, the geometric mean TSH level was low in the current smokers (1.75 mIU/L, 95% CI: 1.67-1.87) compared with the never smokers (1.85 mIU/L, 95% CI: 1.83-1.87). The mean free T4 level was high in the current smokers (1.149 ng/dL, 95% CI: 1.139-1.159) compared with the never smokers (1.138 ng/dL, 95% CI: 1.135-1.140). Among the current male smokers, heavy daily smoking (over 2 packs per day) was more associated with low TSH levels than moderate smoking (less than 1 pack per day). In men, the prevalence of subclinical hypothyroidism was low in the current smokers compared with the never smokers (odds ratio: 0.53, 95% CI: 0.43-0.66). CONCLUSION: We found that current smokers had lower TSH levels and higher free T4 levels than never smokers in both men and women and smoking was associated with a low prevalence of subclinical hypothyroidism in men, which may be of importance when evaluating subjects with subclinical hypothyroidism in Korea.
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BACKGROUND An increase in oxidative stress is postulated to contribute to the development of diabetic complications and the use of antioxidant therapy could be protective against these processes. This study was performed to investigate the role of the antioxidant S-allylcysteine (SAC), a water-soluble component of aged garlic, for reducing levels of oxidative stress that occurs in diabetic rats. METHODS: SAC (100 mg/head/day) was administered orally to streptozotocin-induced diabetic rats for eight weeks. The effects of SAC on the levels of markers of oxidative stress (malondialdehyde and glutathione) and mRNA expression of antioxidant enzymes were measured in the liver and kidney. RESULTS: SAC-fed rats showed lower cholesterol and triacylglyceride levels than untreated diabetic rats. Malondialdehyde levels were increased in the liver and kidney of diabetic rats and SAC administration lowered the levels in both organs. Glutathione levels were lower in the liver and kidney of diabetic rats, and SAC administration restored the glutathione to a level similar in non-diabetic rats. In the liver and kidney of untreated diabetic rats, mRNA expression of catalase, superoxide dismutase and glutathione reductase were down regulated, and administration of SAC increased expression of these enzymes. CONCLUSION: Our results have shown that administration of SAC to diabetic rats can lower blood lipid levels and alleviate oxidative stress in the diabetic tissues, suggesting that SAC might have beneficial effects in a prevention trial for diabetic complications.
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Magnetic resonance imaging (MRI) is the modality of choice for the detection and characterization of a pituitary adenoma. Uptake of (18)F-fluorodeoxyglucose (FDG) by intrasellar tumors, including pituitary adenomas, has been reported in several previous studies. We report a case where a pituitary adenoma was detected on FDG-positron emission tomography (PET), but the tumor was not detected with the use of sellar MRI. A 31-year-old woman was referred to the clinic due to a focal increase of FDG uptake at the pituitary fossa seen on whole body FDG-PET. The patient was receiving chemotherapy due to a recurred B-cell lymphoma of the mucosa-associated lymphoid tissue type. Subsequently, sellar MRI was performed, and images showed a small non-enhancing heterogenous cystic lesion in the midline of the pituitary gland, radiologically suggestive of a Rathke's cleft cyst. However, sellar MRI failed to identify a lesion consistent with a pituitary tumor that corresponded to the site of increased FDG uptake detected by the use of PET, despite the inclusion of a dynamic contrast enhanced sequence. Despite the negative findings of the MRI examination, basal and stimulated levels of the GnRH free alpha-subunit were profoundly increased. Therefore, we suspected the presence of a non-functional pituitary tumor in addition to a Rathke's cleft cyst, rather than pituitary involvement of a lymphoma, based on the hormone levels and PET scan findings.
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J Korean Endocr Soc. 2008;23(2):142-147. Published online April 1, 2008
Idiopathic central diabetes insipidus is most likely to occur in young patients who have a clinical history of autoimmune disease. The presentation of clinical findings such as central diabetes insipidus and pituitary stalk thickening on sellar magnetic resonance imaging (MRI) in a young women would strongly suggest lymphocytic hypophysitis, which is a rare inflammatory process involving the pituitary stalk and the pituitary gland, yet this disease can sometimes regress.