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By Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)

ISBN-10: 3540672168

ISBN-13: 9783540672166

ISBN-10: 3642181945

ISBN-13: 9783642181948

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Extra resources for Abdominal and Pelvic MRI

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2 Results and Role of MRI For the detection of metastases, MRI has been shown to have an overall sensitivity of 78%-83% and a specificity of 89% for resectability (SOYER et al. 1996; NELSON et al. 1988; KUHLMAN et al. 1994; URHAHN et al. 1996). The sensitivity for CT reaches as high as 89% (URHAHN et al. 1996), and overall results for CT have improved with helical CT because the speed with which the liver can be scanned eliminates breathing artifacts, and better bolus techniques and reconstruction at smaller slice increments than were scanned improve lesion conspicuity (URBAN et al.

2. a A T2-weighted spin-echo sequence with fat suppression shows multiple nodular areas of high signal intensity throughout the liver. b The corresponding gadoliniumenhanced gradient-echo sequence demonstrates multiple target lesions (arrows) indicative of diffuse metastatic disease from a sarcoma intensity on delayed scans because they are filled with fluid which does not communicate with the vascular space. If a cyst becomes very large, it may compress liver tissue, which may appear as an enhancing rim.

1994; REIMER et 1989b; PAULSON et al. 1994; GABATA et al. 1990). al. 1997). All these agents have been shown to yield When present, a hypointense tumor capsule is best peripheral nodular enhancement on early scans and seen on Tl-weighted images (the appearance is more or less complete fill-in on delayed scans similar to that of a capsule in well-defined hepato(HAMM et al. 1990; RUMMENY et al. 1991a). These cellular carcinoma). MRI can also demonstrate areas enhancement patterns are similar to those obtained of intratumoral bleeding as hyperintense regions on with dynamic CT.

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Abdominal and Pelvic MRI by Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)

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