1,720,979 research outputs found
Contrast media in liver sonography: correlation with enhanced dynamic magnetic resonance imaging
No full textRetroperitoneal nodular fasciitis: magnetic resonance imaging (MRI) and pathological features
No full textreference to its peculiar radiological and pathological features is described. Only a few cases of pelvic nodular fasciitis are reported in the English literature and at the best of our knowledge, this is the first case of retroperitoneal origin. This report discusses the role of MRI in the characterization of soft tissue masses. No specific MRI findings of nodular fasciitis were identified and MRI doesn't add any contribution to the differential diagnosis between benign and malignant lesions. As a consequence, the histopathological examination is necessary for a definitive diagnosis
CAD systems for mammography: a real opportunity? A review of the literature
No full textThe introduction of systems for automated reading in
mammography has been proposed to improve the sensitivity
[computer-aided detection (CADe) systems] and, more recently,
the specificity [computer-aided diagnosis (CADi) systems] of the
test. Only CADe systems have been approved by the U.S. Food
and Drug Administration (FDA) and are used in current practice.
These systems are still under discussion. Several studies have
demonstrated that they are beneficial to inexperienced readers and
that, through comparison with the computer, radiologists are led to
improve their performance. However, there is still considerable
variation among different studies in the level of benefit deriving
from CAD. Therefore the role of these systems in clinical practice
is still debated, and their real contribution to the overall
management of the diagnostic process is not yet clear
Deep retroperitoneal pelvic endometriosis: MR imaging appearance with laparoscopic correlation
No full textDeep pelvic endometriosis is defined as subperitoneal infiltration of endometrial implants in the uterosacral ligaments, rectum, rectovaginal septum, vagina, or bladder. It is responsible for severe pelvic pain. Accurate preoperative assessment of disease extension is required for planning complete surgical excision, but such assessment is difficult with physical examination. Various sonographic approaches (transvaginal, transrectal, endoscopic transrectal) have been used for this purpose but do not allow panoramic evaluation. Furthermore, exploratory laparoscopy has limitations in demonstrating deep endometriotic lesions hidden by adhesions or located in the subperitoneal space. Despite some limitations, magnetic resonance (MR) imaging is able to directly demonstrate deep pelvic endometriosis. The MR imaging features depend on the type of lesions: infiltrating small implants, solid deep lesions mainly located in the posterior cul-de-sac and involving the uterosacral ligaments and torus uterinus, or visceral endometriosis involving the bladder and rectal wall. Solid deep lesions have low to intermediate signal intensity with punctate regions of high signal intensity on T1-weighted images, show uniform low signal intensity on T2-weighted images, and can demonstrate enhancement on contrast-enhanced images. MR imaging is a useful adjunct to physical examination and transvaginal or transrectal sonography in evaluation of patients with deep infiltrating endometriosis
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