MR Angiography of Renal Cell Carcinoma

Oka, Toshitsugu; Morimoto, K.; Shimoi, Mutsuo; Tsujimura, Akira; Yasunaga, Yutaka; Matsumiya, Kiyomi; Takaha, M

doi:10.1159/000282483

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Additionally, gradient-echo acquisitions have been shown to allow accurate visualization of venous thrombosis. Gradient-echo pulse sequences with fast acquisition times permit examinations within short breath-holding times [2,15,16,17]. Dual-phase MR angiography has recently demonstrated its capabilities to diagnose venous invasion at the same time that it depicts the arterial supply of renal carcinoma [18].…”

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confidence: 99%

Renal carcinoma: diagnosis of venous invasion with Gd-enhanced MR venography

et al. 2000

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The aim of this study was to evaluate the usefulness of gadolinium-enhanced time-of-flight magnetic resonance venography (MRV) in the diagnosis of bland thrombosis/tumoral invasion in the preoperative assessment of renal cell carcinoma. Preoperative precontrast and enhanced GRE fast lowangle shot (FLASH) images of 36 patients with renal adenocarcinoma were reviewed and compared with pre- and post-contrast T1-weighted images. All patients underwent surgery, and MR findings were blindly and prospectively compared with surgical and pathologic data, considered the standard. Renal vein and vena cava were involved in 17 and 9 patients, respectively; right atrial extension was present in one patient. Precontrast spin-echo (SE) and FLASH images were 88% sensitive and 100% specific in the detection of venous involvement, respectively, and enhanced FLASH images 100% sensitive and 96% specific. The nature of thrombus (neoplastic or bland) was more accurately assessed (McNemar's, p < 0.05) with FLASH-enhanced MR images (sensitivity 89%; specificity 96%) than with SE and precontrast FLASH images (sensitivity 79%; specificity 94%). Our data suggest that use of Gd-enhanced MRV might improve preoperative assessment of vascular involvement in renal carcinoma.

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confidence: 99%

Renal carcinoma: diagnosis of venous invasion with Gd-enhanced MR venography

et al. 2000

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“…DEBATIN et al have shown that 2-D PC resulted in a 60% error rate when evaluating potential kidney donors (11). In addition to renal artery stenosis, MRA has been used to assess the renal vascular structure in renal cell carcinoma and renal infarction (65,70). Physiological alterations in the renal function can be studied by measuring the renal blood flow by MRA.…”

Section: Clinical Resultsmentioning

confidence: 99%

MR Angiography of Abdominal and Peripheral Arteries

et al. 1996

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This review article deals with MR angiography (MRA) of abdominal and peripheral arteries. Pulsatile flow, respiratory motion and peristalsis impose difficulties in imaging the vascular structures in the abdomen and the lower extremities. Development of new techniques, such as segmentation of the data acquisition, using specific acquisition windows in relation to a cardiac trigger, magnetization preparation of the tissue and phase-encoding re-ordering or sorting, have reduced the artifacts associated with abdominal and peripheral MRA. Clinical MR investigations of the arteries branching from the abdominal aorta such as the renal and mesenteric arteries and arteries in the lower extremities have revealed that severe stenoses or occlusions can be diagnosed accurately while the grading of less severe stenosis is more difficult. The phase-contrast method has been used to quantify blood flow and study the hemodynamics in abdominal and peripheral vessels. Quantitative flow information can be used to diagnose vascular disease and provides important physiological information. More prospective clinical studies, in which recently developed MRA techniques are compared with conventional angiography, are necessary before conclusive decisions can be made as to whether MRA may replace these methods.

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MR angiography: noninvasive vascular imaging of the abdomen

2002

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Magnetic resonance angiography (MRA) has been used to image abdominal vessels less frequently than renal arteries. Until the use of fast contrast-enhanced (CE) techniques, an important limitation was the acquisition time of phase-contrast or time-of-flight imaging and, consequently, the creation of motion artifacts. Recent advances in MRA technology have shortened acquisition times, so it is now possible to obtain successive images in the arterial and then the portal phase. MRA can be used as an adjunct to any MR examination to assess, e.g., the arterial feeding of hepatocellular carcinoma, the encasement of arteries, and segmental portal thrombosis in pancreatic carcinoma. However, MRA has been used mainly to study chronic mesenteric ischemia, portal vein diseases, and complications from liver transplantation. The portal venous system is exquisitely portrayed with this method; MRA is as accurate as digital subtraction angiography (DSA) in the diagnosis of portal vein diseases. Acute mesenteric ischemia is an emergency in which computed tomography is the most appropriate imaging modality. Conversely, chronic mesenteric ischemia is best examined with CE-MRA, which is almost as accurate as DSA. CE-MRA is superior to DSA for the simultaneous exploration of the aorta, renal arteries, and iliac arteries, thereby providing a panoramic view of abdominal vascular involvement. MRA can be coupled with measurements of flow. With this functional approach, MRA is the only modality that can completely assess vascular diseases of the abdomen.

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MR Angiography of Renal Cell Carcinoma

Cited by 3 publications

References 7 publications

Renal carcinoma: diagnosis of venous invasion with Gd-enhanced MR venography

Renal carcinoma: diagnosis of venous invasion with Gd-enhanced MR venography

MR Angiography of Abdominal and Peripheral Arteries

MR angiography: noninvasive vascular imaging of the abdomen

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