Nonenhanced CT has a higher sensitivity for the detection of ureteral calculi compared with US.

For the treatment of iatrogenic femoral pseudoaneurysms, thrombin injection under sonographic guidance is a quick and effective method of therapy. Failures and complications are infrequent. At our institution, sonographically guided thrombin injection has replaced compression repair.

By using a low-milliampere technique and the quick-check method, CT fluoroscopic time and radiation exposure can be minimized.

For the treatment of iatrogenic femoral arterial pseudoaneurysms, thrombin injection with US guidance appears to be superior to compression repair.

Sonographic guidance seems to provide a reasonable alternative to CT in biopsy of small abdominal, pelvic and retroperitoneal lymph nodes.

Objectives To evaluate the safety of gadoxetic acid disodium (Gd-EOB-DTPA) magnetic resonance imaging (MRI) and its efficacy in characterizing liver lesions. Methods Lesion characterization and classification using combined (unenhanced and Gd-EOB-DTPA–enhanced) MRI were compared with those using unenhanced MRI and contrast-enhanced spiral computed tomography (CT) using on-site clinical and off-site blinded evaluations for patients with focal liver lesions. Results Gadoxetic acid disodium was well tolerated in this study. For the clinical evaluation, more lesions were correctly characterized using combined (unenhanced and Gd-EOB-DTPA–enhanced) MRI than using unenhanced MRI and spiral CT (96% vs 84% and 85%, respectively; P ≤ 0.0008). For the blinded evaluation, more lesions were correctly characterized using combined MRI compared with using unenhanced MRI (61%–76% vs 48%–65%, respectively; P ≤ 0.0012 for 2/3 readers); when compared with spiral CT, a similar proportion of lesions were correctly characterized. Conclusions Gadoxetic acid disodium–enhanced MRI is of clinical benefit relative to unenhanced MRI and spiral CT for a radiological diagnosis of liver lesions.

In a phantom model, at simulated physiologic levels of renal enhancement, cysts may pseudoenhance by more than 10 H. Similarly, in patients, cysts may also pseudoenhance; however, most pseudoenhancement does not exceed 10 H. In patients, pseudoenhancement of at least 10 H is more likely in cysts smaller than 2 cm.

US guidance often allows performance of quicker, more accurate procedures than does CT guidance, probably because of its real-time capabilities.