Adult Hirschprung disease: radiographic findings

Hirschprung disease is usually diagnosed in infancy. Occasionally patients reach adulthood without diagnosis or treatment. Four cases of adult Hirschprung disease are described. The principal radiographic findings are a markedly dilated, feces-filled colon above the zone of transition; a narrowed rectum; a cone- or funnel-shaped zone of transition; and a mosaic colonic pattern caused by collapsed redundant mucosa after colonic cleansing. In an adult, identification on a barium enema examination of an abrupt, smooth transition zone in the rectum with proximal colonic dilatation, in conjunction with an appropriate clinical history, should suggest the diagnosis of adult Hirschprung disease.     

Follow-up chest radiographs in Vietnam veterans: are they useful?

Agent Orange exposure and its long-term health consequences on Vietnam veterans have been widely discussed in the past few years. Myriad physical and mental disabilities have been studied with regard to exposure to various herbicides. The number of persons potentially exposed is large, since 2.4-2.8 million U.S. military personnel served in Vietnam. A case-control study was undertaken to determine if persons who served in the U.S. military in Vietnam have either cardiovascular or pulmonary effects that can be demonstrated on long-term follow-up chest radiographs. Information regarding military service in Vietnam was obtained from interviews and, in some cases, review of military records. Vietnam veterans did not have an increased prevalence of abnormalities on follow-up chest radiographs. A subset of Vietnam veterans who had greater estimated opportunities for Agent Orange exposure also did not appear to be at greater risk than the control population.     

Suspected recurrent rectosigmoid carcinoma after abdominoperineal resection: MR imaging and histopathologic findings

Eleven patients who underwent abdominoperineal resection for rectosigmoid carcinoma were examined with magnetic resonance (MR) imaging for suspected recurrent tumor in the presacral space. There were 12 suspected masses in the 11 patients. Ten lesions were malignant, and in two lesions only nonneoplastic inflammatory tissue was found. The signal intensity (SI) of each lesion relative to that of muscle was determined visually and correlated with the histologic findings at surgery or biopsy. The SIs of malignant and benign lesions were indistinguishable. All lesions showed areas of high SI that correlated with carcinoma and tumor necrosis or with non-neoplastic inflammation and edema. Areas of low SI corresponded to reactive fibrous tissue (desmoplastic reaction) with small islands of tumor or to nonneoplastic fibrosis. MR imaging can be useful in determining the extent of suspected tumors, but SIs on T2-weighted images do not permit histologic diagnosis. In particular, distinction of benign from malignant tissue is difficult in tumors with a desmoplastic reaction.     

非晶体硒平板探测器的影像质量比较

目的 比较研究睿影WV3000T和HOLOGIC 2种非晶硒平板探测器的影像质量和解剖结构可见度.方法 分析不同厚度水模影像,评价2种探测器灵敏度,分析30对不同体位的临床影像,采用3点记分法进行观察者评分,并评价15个解剖结构的影像质量和可见度.结果 在2种非晶体硒平板探测器中,水模中铝梯和线对卡影像质量差异无统计学意义(P>0.05);低对比测试卡影像质量差异无统计学意义(P>0.05);临床医学影像质量差异无统计学意义(P>0.05).结论 睿影WV3000T和HOLOGIC非晶硒平板探测器的影像质量和解剖可见度相等.     

Diminished activity of a chemotactic inhibitor in synovial fluids from patients with familial Mediterranean fever

Synovial fluids from patients with osteoarthritis contain a chemotactic inhibitor that acts by antagonizing the complement-derived chemotactic anaphylotoxin, C5a. The activity of this inhibitor in synovial fluids from patients with several forms of inflammatory arthritis (rheumatoid arthritis, systemic lupus erythematosus, ankylosing spondylitis, and gout) were comparable to the activity present in osteoarthritic synovial fluids. In contrast, levels of inhibitory activity in synovial fluids from 9 patients with familial Mediterranean fever were decreased to less than 20% of those found in osteoarthritis fluids. The possibility was considered that the diminished inhibitory activity in fluids from patients with familial Mediterranean fever plays a part in the pathogenesis of the inflammatory attacks characteristic of this disease.     

CT诊断肠系膜静脉栓塞1例

患者男,33岁。因持续上腹部胀痛不适14天,加重6天,为主诉入院。患者有长期饮酒史,每天100~1000ml。入院当天查血细胞分析正常,血淀粉酶正常,尿淀粉酶1800U/L,腹部平片未见异常。以“急性胰腺炎”收入院。腹部CT平扫见胰腺边缘毛糙,周围见轻度渗出性改变。肠系膜上静脉明显增粗,密度比主动脉高(图1)。5天后增强扫描见肠系膜上静脉、门静脉主干及其分支内对比剂充盈图1 CT平扫见肠系膜上静脉增粗,腔内密度高于同层面腹主动脉密度图2 5天后增强CT:肠系膜上静脉内对比剂充盈缺损,小肠壁水肿缺损,小肠壁水肿,腹水(图2)。诊断为肠系膜静脉血栓…