Inflammatory pseudotumor of the liver

We present a case of inflammatory pseudotumor of the liver (IPL), a rare benign hepatic lesion. A 66-year-old woman with fever, and right abdominal pain and mass underwent abdominal sonography and computed tomography. Both showed multiple hepatic masses. Ultrasound guided needle liver biopsy showed a dense chronic inflammatory lesion with innumerable foamy histiocytes and spindle fibroblasts consistent with IPL. She improved with conservative treatment. Clinical, pathologic, and imaging findings at IPL are reviewed.     

Splenogonadal fusion presenting as a testicular mass,a case report and literature review

Splenogonadal fusion is a rare, frequently misdiagnosed, congenital anomaly in which the splenic tissue is abnormally attached to the gonadal or mesonephric remnants. It is commonly found as an incidental finding at autopsy, during orchiopexy or hernia repair. However, it can present as a testicular mass or as an acute scrotal pathology such as testicular torsion or epididymoorchitis. It poses as a diagnostic challenge preoperatively and often leads to unnecessary orchiectomy.We present a case of a 15-year-old male who presented with a long-standing left testicular mass thought to be a testicular tumor. Resection of the lesion along with partial left orchiectomy was done and histopathologic evaluation revealed splenogonadal fusion.     

小型阵列质谱仪及其在载人航天中的应用

本文描述了阵列质谱仪的工作原理及体积、质量、功耗、一机多用以及与小型气相色谱和热导检测器联用时所具有的冗余设计等特点,介绍了小型阵列质谱仪发展过程中形成的3种结构类型及性能．阐述了小型阵列质谱仪在载人航天中的广泛应用。     

Prominent crista terminalis mimicking a right atrial mass: A case report and brief review of the literature

The crista terminalis is a normal anatomical structure, characterized by a smooth muscular ridge along the superior aspect of the right atrium. It is derived from resorption of the right valve of the sinus venosus and it divides the right atrium into smooth posteromedial and trabeculated anterolateral portions. Crista terminalis is not normally detected in the standard views of transthoracic echocardiogram and non-gated CT of the chest. In rare circumstances, the crista terminalis may be prominent and could lead to misdiagnosis as a malignant process, such as in our case. A comprehensive understanding of the crista terminalis anatomy, and its characteristic appearance on transthoracic echocardiogram, CT and PET/CT will minimize the risk of misdiagnosis and will avoid patient anxiety with more extensive examinations. Here, we present a case of a 78-year-old male with newly diagnosed high-grade invasive urinary bladder urothelial carcinoma. Pre-operative transthoracic echocardiogram reported as 2 cm right atrial mass concerning a metastasis lesion. Subsequent evaluation with MRI cardiac morphology confirmed the diagnosis of benign prominent crista terminalis, a normal anatomical structure.     

双能X射线吸收测定法测量身体成分的应用及研究进展

双能X射线吸收测定法（DXA）具有辐射剂量低、重现性好、扫描时间短和容易获得等优势,广泛应用于临床和科研中。DXA体成分分析可检测骨密度、脂肪质量、瘦体质量、去脂肪质量和体脂率等多种身体成分。目前,DXA体成分分析在各种临床疾病的诊断、治疗及风险评估中被广泛地应用,笔者就DXA体成分分析在一些临床疾病中的应用及最新研究进展作简要综述。     

Dynamic walking stability of elderly people with various BMIs

BackgroundFalls are one of the major causes of injury in the elderly. Obesity may be related to the risk of falling. Understanding the dynamic stability mechanisms of obese elderly people during gait is important as it may be associated with fall protection.Research questionDoes obesity affect the dynamic walking stability of elderly people?MethodsThis is a prospective study. Fifty-three elderly participants, aged 60–82 years, were categorized into body mass index (BMI) groups. In single-limb support experiments, the center of mass velocity (COMv), center of mass acceleration (COMa), region of velocity stability (ROSv) and region of acceleration stability (ROSa) were calculated using kinematic data sampled from a motion analysis system. In addition, all participants were assessed for the dynamic balance ability test scale (DBATS). Statistical analyses were performed by one-way ANOVA, Kruskal–Wallis/Wilcoxon nonparametric tests, or bivariate Pearson/Spearman correlation analysis.ResultsDuring walking, peak COMv and COMa decreased with increasing BMI (Normal BMI: 1.20 ± 0.14 m/s, 1.66 ± 0.36 m/s²; High BMI: 1.14 ± 0.11 m/s, 1.56 ± 0.30 m/s²; Higher BMI: 1.04 ± 0.15 m/s, 1.47 ± 0.25 m/s²). At toe-off (TO), the normalized participants’ center of mass (COM) is significantly more anterior in the Higher BMI group (Normal BMI: -0.30 ± 0.09, High BMI: -0.23 ± 0.07, Higher BMI: -0.16 ± 0.10), their normalized COMv and COMa (Normal BMI: 1.40 ± 0.16, 0.53 ± 0.11; High BMI: 1.33 ± 0.13, 0.49 ± 0.11; Higher BMI: 1.21 ± 0.16, 0.46 ± 0.11) are slower. The mean DBATS score of the Higher BMI group was the highest, indicating the weakest dynamic balance ability.SignificanceThe COM dynamic stability parameters indicate that obesity may worsen balance, with the peak COMv and ROSv most affected. With increasing BMI, the dynamic stability and balance of elderly people both decreased.     

Rowing performance of female and male rowers

This study evaluated the rowing performance of female and male rowers with regard to their body size. Body height, body mass, fat-free mass, maximal oxygen uptake (VO2max), and "2000-m" rowing ergometer performance were measured in 71 females (age range 18-24 years, height 153-173 cm, body mass 43-69 kg, fat-free mass 34-55 kg; VO2max 2.1-3.9 L min(-1); 2000-m time 437-556 s) and 120 males (age 18-24 years, height 164-193 cm, body mass 58-95 kg, fat-free mass 50-81 kg; VO2max 3.4-5.6 L min(-1); 2000-m time 378-484 s). Rowing performance was correlated to body height (r=-0.81, P<0.001), body mass (r=-0.85, P<0.001), fat-free mass (r=-0.91, P<0.001), and VO2max (r=-0.90, P<0.001). However, rowing time was slower in the females than in the males with a similar body height (by approximately 10%) and body mass (by approximately 9%), but the sex difference was smaller when the fat-free mass (by approximately 4%) and VO2max (by approximately 4%) were matched. This study suggests that individuals with large body size and aerobic capacity possess an advantage for a 2000-m row on an ergometer. However, among females and males the variation in body size and aerobic capacity cannot explain the entire sex difference in ergometer rowing performance.     

Displaced aortic arch sign on chest radiographs: a new sign for the detection of a left paratracheal esophageal mass

Our objective was to ascertain whether displacement of the aortic knob on chest radiographs could be used as a sign to detect a left paratracheal esophageal mass. Sixty-one consecutive pathologically proven esophageal cancer patients were included in this study according to the following criteria: tumor at the aortic arch level; chest radiographs in the neutral position; no unilateral volume loss in the lung. Sixty-one sex- and age-matched subjects served as the control group. To measure the extent of displacement of the aortic arch, we drew a circle over the aortic knob, fitting more than one-quarter of the circumference on the chest radiograph. The distance between the medial end of the circle and the left margin of the trachea (aortic displacement value, ADV) was measured. The difference of the ADV between the study group and the control group was analyzed using a paired t test. The aortic displacement value was significantly larger in the study group (11.7±4.5 mm) than in the control group (5.6±2.9 mm). When we applied 10 mm as a threshold level, sensitivity and specificity on detection of esophageal cancer were 78.7 and 78.7%, respectively. Displacement of the aortic knob may be a useful sign to indicate a left paratracheal esophageal mass.     

肽质量指纹图谱中实验因素引起的氨基酸修饰以及相应肽段的质量变化

目的：肽质量指纹图谱是蛋白质组研究．中最重要的蛋白鉴定手段之一，而氨基酸残基的化学修饰会导致图谱中肽质量的改变。本文对实验性因素可能引起的这种质量改变进行了较为系统的观察和小结。方法：本文分析了多个标准蛋白基于SDS-PAGE分离的肽质量指纹图谱的实验结果，综合报道由各种实验因素引起的氨基酸残基体外化学修饰以及相应的肽质量变化。结果：这些化学修饰至少包括：①半胱氨酸残基丙烯酰胺加合物生成或乙酰基烷基化修饰。相应的肽段质量数分别增加71．04和57．02；②甲硫氨酸残基的氧化修饰，相应肽段质量数增加15．99（单甲硫氨酸氧化）或其倍数（多甲硫氨酸氧化）；③酸性氨基酸残基的成盐反应，相应肽段质量数增加21.98（加钠盐）或37．95（加钾盐）；④酸性氨基酸残基的酯化反应，相应肽段质量数增加14.03（甲醇固定）或28．03（乙醇固定）；⑤碱性氨基酸（赖氨酸）残基与甲醛发生西佛碱反应，相应肽段质量数增加27．99。以上各种氨基酸的体外修饰，以甲硫氨酸的氧化修饰最为常见；酸性氨基酸的酯化反应通常发生在蛋白固定步骤；碱性氨基酸（赖氨酸）的西佛碱反应是由于蛋白质银染时增色剂甲醛的引入。特别注意的是，某些肽段可以同时发生多种化学修饰，使得肽质量指纹图谱的解析复杂化。结论：以上实验因素引起的氨基酸修饰以及相应的肽质量变化在蛋白质数据库检索和蛋白质鉴定时必须加以考虑。     

罗索线虫的规格化大量养殖

根据豫南罗索虫和罗索线虫未定种(R.SP)的生物学特性,参考Petersen(1972)和Platzer等(1978)的方法,成功地建立了豫南0084株和R.SP的规格化大量养殖技术。选用致倦库蚊作养殖宿主时,宿主与寄生线虫之比为1:3,其05感0染率为82～91.3％。用1克线虫(约3000条)培养于30eraX20era×5era沙盘内t 40～150天共可孵出寄生前期幼虫200,000～800,000条。用中华按蚊作R.sP.的养殖宿主,其感染比例为l·5时·中华按蚊幼虫的感染率为55.7～71.2％。培养3000条寄生后期幼虫共孵出寄生前期幼虫110。000～400,000条。此项技术不仅为本研究提供了大量虫源,且在国内对索线虫的研究和开发、应用的重要作用。     

颈部肿块血管造影诊断

目的：探讨颈部肿块的血管造影表现及共对颈部肿块的诊断价值。材料与方法：２８例颈部肿块患者２５例经手术病理证实，血管性肿块１３例，其中假性动脉瘤７例，静脉瘤３例，动脉迂曲３例，非血管性肿块１５例，其中颈部动脉瘤９例，神经鞘膜瘤４例，海绵状淋巴管瘤２例，分析其血管造影表现，并与临床，病理结果对比分析。结果：１３例血管性肿块和９例颈动脉体瘤因有典型的造影表现与病理一致，其余６例因缺少肿瘤血管或典型表面而     

Atypical imaging presentation of a massive intracavitary cardiac thrombus: A case report and brief review of the literature

Intracavitary cardiac thrombi, uncommonly found in the right chambers, have been shown to form secondary to endocardial and myocardial diseases. The differential diagnosis for an intracavitary cardiac mass is broad, including primary cardiac tumors, cardiac metastases, anatomic variants, vegetations, and thrombi. Here we present a unique case with a large calcified intracavitary cardiac thrombus in a 26-year-old woman with obesity, immune thrombocytopenic purpura, and a new diagnosis of systemic lupus erythematosus. Initial imaging presentation in this case masqueraded as a tumor, delaying the true diagnosis. A combination of cardiac imaging techniques, including transthoracic and transesophageal echocardiograms, cardiac CT, and cardiac MRI were required to correctly diagnose this calcified bland thrombus.     

Incidental finding of a right ventricular mass: Fibroma or thrombosis?

Primary cardiac tumors are very rare and are often confused with other conditions due to clinical presentations or initial imaging. Here, we present a rare case of a 56-year-old male with right ventricular mass incidentally found on imaging. Appropriate testing should be conducted to rule out the possibility of a benign tumor. Asymptomatic patients with co-morbidities can be managed without surgery. More research is needed to devise guidelines for the management of these cases.