Radiology
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Ultrasonography (US) with a high-frequency (7.5-10-MHz) transducer has become the imaging modality of choice for examination of the scrotum. US examination can provide information valuable for the differential diagnosis of a variety of disease processes involving the scrotum that have similar clinical manifestations (eg, pain, swelling, or presence of mass). ⋯ This review covers the anatomy of the scrotum and the scanning protocol for scrotal US, as well as detailed descriptions of disease processes and their US appearances. Newly described conditions such as intratesticular varicoceles and other benign intratesticular cystic lesions are also discussed.
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Bowel ischemia may be caused by many conditions and manifest with typical or atypical and specific or nonspecific clinical, laboratory, and radiologic findings. It may mimic various intestinal diseases and be confused with certain nonischemic conditions clinically and at computed tomography (CT). Bowel ischemia severity ranges from mild (generally transient superficial changes of intestinal mucosa) to more dangerous and potentially life-threatening transmural bowel wall necrosis. ⋯ Unfortunately, common CT findings in bowel ischemia are not specific, and specific findings are rather uncommon. Therefore, it often is a combination of nonspecific clinical, laboratory, and radiologic findings-especially detailed knowledge about the pathogenesis of acute bowel ischemia in different conditions-that helps most in correct interpretation of CT findings. To improve understanding of this complex heterogeneous entity, this article provides an overview of the anatomy and physiology of mesenteric perfusion and discussions of causes and pathogenesis of acute bowel ischemia, CT findings in various types of acute bowel ischemia, and potential pitfalls of CT.
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Carotid arterial endarterectomy is considered to be the standard for the treatment of atherosclerotic carotid arterial occlusive disease. This has been validated with results of several randomized controlled trials in which its effectiveness has been demonstrated over that of the best nonsurgical therapy. ⋯ A brief description of the current technical aspects of carotid artery stent placement is presented. The future status of the endovascular approach will be determined with randomized trials in which carotid artery stent placement is directly compared with endarterectomy, as well as by the potential for further innovation and improvement in endovascular devices, technique, and safety.
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Radiologists frequently perform invasive diagnostic and therapeutic procedures involving needles and/or vascular access, and often they do so in darkened rooms. Therefore, they are at risk of exposure to blood-borne pathogens. The risk of HIV infection with a single sharp injury is low (0.3%), and on average 99.7% of exposures will not result in infection. ⋯ The postexposure prophylaxis protocol used at the University of California, San Francisco, can be reviewed by visiting its World Wide Web site at http://epi-center.ucsf.edu. And up-to-date information is available to both Veterans Administration and other health care staff worldwide by J. Michael Howe, MSLS, of the AIDS Information Center, a service of the VA HIV/AIDS National Training Program, located at the Veterans Administration Medical Center, San Francisco, University of California, San Francisco (hivinfo@itsa.ucsf.edu).