少见胸腺肿瘤及肿瘤样病变的CT表现

目的：探讨少见胸腺肿瘤及肿瘤样病变的CT表现。方法：搜集8例经病理证实的少见胸腺肿瘤及肿瘤样病变，与病理结果对照，结合献分析CT表现。结果：8例中淋巴瘤3例，畸胎瘤2例，囊肿2例，脂肪瘤1例。结论：CT检查对少见胸腺肿瘤及肿瘤样病变有较大价值，部分病变可确诊。     

肾脏嗜酸细胞瘤的CT诊断

分析肾嗜酸细胞瘤的ＣＴ表现及其病理基础，以提高对此瘤的认识。材料与方法：２例肾嗜酸细胞瘤经病理诊断，术前均行ＣＴ平扫及增强扫描。结果；２例为单发肿瘤，直径为４．８ｃｍ及５．０ｃｍ。     

四种弥漫性胸膜疾病CT影像特征

本文分析了恶性胸膜间皮瘤、胸膜转移瘤、脓胸、纤维胸等四种胸膜弥漫性疾病（共６３例，其中恶性病变３９例，良性病变２４例）的ＣＴ特征。结节性增厚、壁层胸膜厚度大于１ｃｍ及纵隔胸膜受累、肺门和纵隔淋巴结受累多见于恶性病变，其特异性分别为９６％、８７％、７９％和１００％。敏感性分别为６２％、３３％、３８％和３３％。胸膜线状粘连增厚和钙化多提示良性病变，其特异性分别为９２％和１００％，敏感性均为４６％。     

Isolation of an abnormal protein C molecule from the plasma of a patient with thrombotic diathesis

Protein C has been purified from the plasma of a patient with thrombotic diathesis. Both before and after isolation, the protein showed reduced capacity to hydrolyze synthetic substrates and to anticoagulate plasma. Proteolysis with the soluble thrombin- thrombomodulin complex proceeded normally and to completion as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting. Approximately one-third of the protein is functional, indicating a heterozygous defect. Indirect studies suggest that the abnormal component can bind to protein S and phospholipids. Both forms of activated protein C can also incorporate radiolabeled diisopropylfluorophosphate.     

The Effect of Mild Illness on Habituation in the First Year of Life

To determine the effect of mild acute illness on habituationin the first year of life, 14 infants were repeatedly testedwhen well and when ill. Comparison of habituation patterns tovisual and visual-plus-auditory stimulation revealed only minorperformance differences between well and ill infants. However,further analyses on a subgroup of 7 infants demonstrated a numberof disruptive effects associated with febrile illness. Theseeffects were interpreted as hypersensitivity to stimulationresulting in fatigue and disruption of habituation patterns.Tentative practical implications of these findings are thatinfants continue to profit from environmental stimulation duringacute afebrile illness, but that infants with acute febrileillness should be stimulated only for brief periods.     

Interstitial hyperthermia in combination with brachytherapy

Flexible coaxial cables were modified to serve as microwave antennas operating at a frequency of 915 MHz. These antennas were inserted into nylon afterloading tubes that had been implanted in tumors using conventional interstitial implantation techniques for iridium-192 seed brachytherapy. The tumor volume was heated to 42-45 degrees C within 15 minutes and heating was continued for a total of 1 hour per treatment. Immediately following a conventional brachytherapy dose and removal of the iridium seeds the tumors were heated again in a second treatment. This interstitial technique for delivering local hyperthermia should be compatible with most brachytherapy methods. The technique has proved so far to be practical and without complications. Temperature distributions obtained in tissue phantoms and a patient are described.     

Sexual differentiation of arachidonate toxicity in mice

Mature male and female mice 50 days of age were challenged with i.v. sodium arachidonate at doses of 12.5, 25, 50 and 100 mg/kg. A dose-dependent response in terms of mortality was observed. Males were significantly more susceptible to arachidonate-induced mortality than females at the 25 and 50 mg/kg doses (P less than .05). The 100 mg/kg dose produced 100% mortality in both sexes. When mice aged 23, 29, 35 and 50 days were challenged with 50 mg/kg of arachidonate, no gender difference was observed until mice were 35 days of age, at which time the male mortality was 80%, compared to 57% for female mice (P less than .05). Mice gonadectomized at 23 days and intact mice 23 days of age were treated with s.c. estradiol, testosterone or vehicle for 7 days before arachidonate challenge. Among these groups, the gonadectomized females and intact males were significantly protected by estradiol when compared to the appropriate controls (P less than .05). In contrast, testosterone pretreatment had no significant effect on mortality. These results demonstrate that the development of the gender difference in arachidonate-induced mortality in mice is dependent upon the presence of gonadal hormones in the immature stages.     

无症状性脑梗塞的CT表现及病因分析

本文说明了无症状性脑梗塞的病灶大小、分布、特点及CT表现。主要病因是动脉粥样硬化、高血压、糖尿病。     

Iopamidol arteriography: discomfort and pain

A double-blind, randomized study was performed to compare discomfort and pain associated with the use of iopamidol and Hypaque (diatrizoate sodium and diatrizoate meglumine) during iliofemoral runoff arteriography in 33 patients. Iopamidol caused substantially less discomfort and pain. The evaluation was helped by audiotaping the study and comparing patients' vocal responses to injections of these materials.