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  • 1
    ISSN: 1432-0509
    Keywords: Key words: Behçet's disease−Aneurysm−Renal artery−Trancatheter arterial embolization−Computed tomography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We describe a patient with Behçet's disease who developed multiple aneurysms and retroperitoneal hemorrhage due to rupture of a renal artery aneurysm. Despite successful transcatheter arterial embolization, the patient died due to pneumonia. Our retrospective review of the case revealed that the CT scan obtained 3 months before the rupture had demonstrated dilatation of bilateral renal arteries.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0509
    Keywords: Key words: Pancreas—Insulinoma—MRI—STIR image.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We studied the value of short-TI inversion-recovery (STIR) imaging for the localization of pancreatic insulinoma. Four patients (three women and one man aged 35–65 years) with surgically proven insulinoma were included in this study. All patients were examined by MR imaging with spin echo (SE) and STIR sequences. The STIR images were compared with the histopathologic findings in each case. In two patients, the tumors were markedly hyperintense on STIR images, and a 5-mm insulinoma was depicted only by this imaging method in one of the two. In the other two patients, 10-mm insulinomas were only slightly hyperintense on STIR images. The latter tumors had a higher content of collagen fibers than the former, indicating that the amount of collagen influences the signal intensity of insulinoma. Despite some limitations, STIR imaging is a useful noninvasive method for the localization of pancreatic insulinoma.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0509
    Keywords: Key words: Magnetic resonance imaging (MRI)—Liver—Hepatocellular carcinoma—Percutaneous ethanol injection therapy—Parenchymal damage.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: T1- and T2-weighted magnetic resonance (MR) images frequently show fan-shaped areas of hypo- or hyperintensity in the hepatic parenchyma adjacent to a treated hepatocellular carcinoma after percutaneous ethanol injection (PEI) therapy. These areas correspond to abnormal contrast enhancement on serial dynamic MR images. The purpose of the present study was to describe the location, appearance, and frequency of these abnormalities because it is important to understand these entities for the correct assessment of therapeutic efficacy. Methods: MR imaging including a multisection dynamic study was performed in 20 consecutive patients with hepatocellular carcinoma treated with PEI therapy. We retrospectively evaluated the presence of fan-shaped hypointensities adjacent to treated tumors in the liver parenchyma on T1-weighted images and hyperintensities on T2-weighted images and corresponding fan-shaped contrast enhancement on both arterial-dominant and delayed-phase dynamic MR images. We review the location, appearance, and frequency of these findings, and we discuss the possible causes on the basis of pathologic examinations. Results: Seven (35%) of the 20 patients showed fan-shaped hyperintense areas adjacent to the treated tumors on T2-weighted images. These areas showed isointensity in five patients and hypointensity in two patients on T1-weighted images. Of these seven patients, one (14%) underwent the MR imaging within 1 month after the completion of PEI therapy, and six (86%) had it 2–9 months after the completion of PEI therapy (mean = 6 months). In all seven patients, fan-shaped hyperperfusion abnormalities corresponding to these areas of hyperintensity on T2-weighted images were seen on both arterial-dominant and delayed-phase dynamic MR images. Pathologically, the coagulative necrosis of the hepatocytes with sinusoidal dilatation and the restoration by the development of fibrous tissue were seen in these fan-shaped areas. Conclusion: The fan-shaped areas of abnormal intensity on T1- and T2-weighted images and contrast enhancement on dynamic MR images seem to be attributable to pathologic changes in the normal liver parenchyma induced by the toxic reaction of ethanol. Awareness of the occurrence of such abnormalities in the peripheral liver parenchyma adjacent to the treated tumor is important for the correct assessment of therapeutic efficacy. RID=""ID=""〈e5〉Correspondence to:〈/e5〉 T. Fujita
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0509
    Keywords: Key words: MR during arterial portography—CT during arterial portography—Liver—Gadolinium.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: The goal of this study was to investigate the frequency of inhomogeneous parenchymal enhancement of the liver in magnetic resonance imaging during arterial portography (MRAP) versus computed tomography during arterial portography (CTAP). Methods: CTAP and MRAP were performed in 29 and in 21 patients, respectively, who had suspected primary or secondary liver tumors on clinical or biological grounds. We evaluated the frequency of inhomogeneous hepatic parenchymal enhancement not related to a decrease of portal blood supply due to compression or obstruction by the tumor and physiologic variation in portal perfusion. Inhomogeneous parenchymal enhancement of the liver was classified as segmental or subsegmental and as nonsegmental. Results: Segmental or subsegmental inhomogeneous parenchymal enhancement was seen in six of 29 patients (20.1%) on CTAP and in one of 21 patients (4.8%) on MRAP. Nonsegmental inhomogeneous parenchymal enhancement was seen in five of 29 patients (17.2%) on CTAP images and in none of the patients (0%) on MRAP images. The incidence of nonsegmental inhomogeneous parenchymal enhancement was significantly lower on MRAP than on CTAP. Conclusion: MRAP was superior to CTAP in achieving homogeneous parenchymal enhancement of the liver.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0509
    Keywords: Key words: Pancreas—Liver, computed tomography.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: The purpose of the present study was to describe the computed tomography (CT) appearances of transient hepatic attenuation differences (THADs) in patients with acute pancreatitis and to discuss the mechanism of THAD. Methods: Two-phase dynamic CT images of 28 patients with acute pancreatitis were reviewed. Among them, THAD was seen in nine patients. All patients underwent ultrasonography, and four patients with THAD underwent surgery. Results: Three types of THAD (THAD adjacent to the gallbladder in five of 28 patients, THAD with left lobar distribution in three of 28, wedge-shaped THAD in one of 28) were seen on the two-phase dynamic CT scans of patients with acute pancreatitis. In five patients, THAD disappeared when acute pancreatitis had subsided. Conclusions: THAD in acute pancreatitis is probably caused by increased arterial blood flow attributable to the inflamed lobe of the liver or the inflamed gallbladder. THAD in acute pancreatitis should not be confused with primary liver abnormalities.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0509
    Keywords: Key words: Cavernous hemangioma—Liver—Fluid–fluid level—Computed tomography—Magnetic resonance imaging.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Fluid–fluid levels were observed in a case of giant cavernous hemangioma on computed tomography (CT) and magnetic resonance (MR) imaging. The fluid–fluid level may be attributed to the separation of blood cells and serous fluid due to the extremely slow flow in cavernous hemangioma of the liver.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 156 (1989), S. 547-569 
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 1265-1266 
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 1265-1266 
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 155 (1989), S. 413-418 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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