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  • 1
    ISSN: 1432-1084
    Keywords: Kidney, CT ; Kidney, haemorrhage ; Kidney, MR studies ; Kidney, neoplasms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of this study was to compare the potentials of MRI and CT for characterising renal angiomyolipomas. MRI and CT examinations of 13 adult patients with renal angiomyolipoma were reviewed. Pathological correlation was available for ten patients who underwent nephrectomy or tumourectomy. Negative CT density numbers were demonstrated in 10 cases. MRI depicted high signal intensity areas suggesting fat in 11 cases. A haemorrhagic component was by both CT and MRI in 4 cases and was confirmed by surgery. Fat suppression imaging was performed in 3 cases and confirmed the presence of fat. We conclude that identification of angiomyolipomas can be achieved by MRI, but compared with CT, MRI is more expensive and less available. Therefore MRI should be performed when CT results are equivocal and when direct multiplanar images are necessary for a precise tumour localisation of multiple angiomyolipomas.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1084
    Keywords: Key words: Foreign bodies ; Textiloma ; Surgery complications ; Medicolegal problems ; CT ; MR imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We describe changes in imaging features of a textiloma (retained surgical sponge or retained foreign body) left in the renal fossa after exploratory renal surgery. One year after the initial surgery, the MR aspect of the textiloma was not specific, with a homogeneous low signal intensity on T1-weighted images. Serial CT examinations over 4 years demonstrated progressive growth and calcification of the mass which appeared pseudocystic with a peripheral inflammatory wall. Granulomas caused by a retained surgical sponge should be considered as a cause of retroperitoneal mass in patients with a history of prior surgery.
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  • 3
    ISSN: 1432-1084
    Keywords: Key words: MR imaging ; Contrast enhancement ; Liver ; Neoplasm ; Focal nodular hyperplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to assess the efficacy of a superparamagnetic iron oxide, ferumoxides, in the detection and characterization of focal nodular hyperplasia (FNH) on MR conventional spin-echo (SE), fast spin-echo (FSE) and gradient-echo (GRE) images. Fourteen adults with 27 FNHs were evaluated at 1.5 T before and after injection of ferumoxides. T1-weighted and T2-weighted SE, T2-weighted FSE and T2*-weighted GRE sequences were used and analysed qualitatively and quantitatively. One hundred percent of FNHs showed a significant postcontrast decrease in signal intensity on T2- and T2*-weighted images. Heavily T2-weighted SE images showed the maximum decrease in FNH signal-to-noise ratio (S/N). Postcontrast GRE T2*-weighted images improved the detection of the central scar and the delineation of FNHs and demonstrated the best lesion-to-liver contrast-to-noise ratio (C/N). Postcontrast T1-weighted SE images showed the least lesion-to-liver C/N. Ferumoxides-enhanced MR imaging can help detect and characterize FNH. Conventional pre- and postcontrast T2-weighted SE images and postcontrast GRE T2*-weighted images should be used preferentially.
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  • 4
    ISSN: 1432-1084
    Keywords: Erdheim-Chester disease ; Bone sclerosis ; Kidney, pyelonephritis ; Kidney, computed tomography ; Xanthogranulomatosis ; Lipogranulomatosis ; Diabetes insipidus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Erdheim-Chester disease is a rare, distinctive lipoidosis characterised by deposition of cholesterol-laden foam cells in the bone marrow associated with a granulomatous reaction affecting the lungs, pericardium, heart and retroperitoneum. A case of Erdheim-Chester disease is presented, with typical skeletal involvement (i. e. diffuse sclerosis of the diaphyses and metaphyses of the long tubular bones) and atypical features including thrombocythemia and renal involvement which was documented on computed tomography. Other features of the reported case include gonadttrophin insufficiency and diabetes insipidus.
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  • 5
    ISSN: 1432-1084
    Keywords: Budd-Chiari syndrome ; Hepatic veins ; Doppler studies ; Hepatic veins, thrombosis ; Hepatic veins, ultrasound studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This retrospective study was designed to evaluate duplex sonography in the diagnosis and follow-up of patients with Budd-Chiari syndrome. Thirteen patients with clotting disease and histologically proven Budd-Chiari syndrome (3 acute and 10 chronic cases) were examined, using conventional duplex sonography (n=5) or colour-coded duplex sonography (n=8). Results were compared with CT in 6 cases, MRI in 11, coeliac and mesentric angiography in 5, and hepatic wedge venography and cavography in 6. Of 39 hepatic veins examined, 33 had an abnormal appearance on ultrasound studies: endoluminal thrombus, stenosis, dilatation, thick wall echoes. Doppler findings included total obstruction of 8 hepatic veins, reversed flow in 22 hepatic veins and intrahepatic collaterals with continous non-phasic flow in all cases. Duplex sonography showed portal thrombosis (n=1), evidence of portal hypertension (n=8) and inferior vena cava thrombosis (n=2). Nine patients were treated surgically. Patency of portocaval shunts was correctly assessed with colour coded duplex sonography in 8 of 9 patients. We believe that colour Doppler imaging is the procedure of choice for initial diagnosis of Budd-Chiari syndrome.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 348-348 
    ISSN: 1432-1084
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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  • 7
    ISSN: 1432-1084
    Keywords: Mesentery inflammation ; Colour Doppler ; Computed tomography ; MRI studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a case of sclerosing mesenteritis with fibrofatty thickening of the mesentery. Ultrasonography showed an echodense mesenteric mass and colour-Doppler displayed patent mesenteric vessels with high vascular resistance. On CT, low-density areas suggesting fatty infiltration were seen in the mesentery. MRI showed low-signal areas suggesting a fibrous component of the mesenteric mass and GRASS imaging confirmed normal patency of the mesenteric vessels.
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  • 8
    ISSN: 1432-1084
    Keywords: Kidney, transplantation ; Kidney, neoplasms ; Kidney, lymphoma ; Lymphoma ; Urinary bladder, lymphoma ; Drugs, toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to study the clinical and radiological manifestations of post-transplantation malignant genito-urinary tumours in kidney recipients, we reviewed nine cases of genito-urinary neoplasms among 65 malignancies which developed in 61 of 620 kidney recipients. Ultrasound (US) and CT examinations were available in all the cases and MRI imaging in three. For each patient we reviewed the date of transplantation, immunosuppressive therapy, pathology and surgical reports and relevant radiographic studies. We determined tumour volume, the presence of necrosis and tumour extension. The malignant tumours included B-cell non-Hodgkin lymphomas of the native kidney (2) and urinary bladder (1), renal cell carcinoma (1), urotheliomas of the renal pelvis (1), ureter (1) and bladder (1), epidermoid carcinoma of the renal pelvis (1) and embryonal testicular carcinoma (1). Two of the three lymphomas developed in cyclosporine-treated recipients and regressed after reduction of the cyclosporine dose. The lymphomas presented as solid masses with necrosis visible on T2-weigthed MRI images. Other non-lymphomatous neoplasms were characterised by a large tumour volume and advanced local and regional extension. Five patients died within 2 years after diagnosis. It is concluded that the high incidence of malignancies (9.8 %), especially of the genito-urinary tract (1.4 %), and their advanced stage warrant radiographic follow-up studies.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 25 (2000), S. 424-430 
    ISSN: 1432-0509
    Keywords: Key words: Kidney, injuries—Kidney, computed tomography—Kidney, ultrasound—Kidney, urography—Kidney, angiography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The kidney is the most commonly injured genitourinary organ. The diagnosis and treatment depend on the mechanism of injury (blunt or penetrating trauma), the clinical presentation, and the extent of the lesions. Knowledge of the different appearances of the posttraumatic kidney on imaging studies is essential for prompt and effective treatment of patients. This pictorial essay reviews the imaging evaluation and principal imaging findings associated with blunt and penetrating renal trauma. The role of computed tomography is emphasized because it is a very sensitive, specific, and accurate modality in detecting the presence or absence of injury and defining its extent.
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