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  • 1
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Angiom ; „tufted angioma“ ; Angioblastom ; kapilläres Hämangiom ; Immunhistochemie ; Key words Angioma ; Tufted angioma ; Angioblastoma ; Capillary haemangioma ; Immunhistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Two female and three male patients with acquired “tufted angioma” are presented. The age of these patients ranged from 10 to 62 years. Two lesions were sited in the head and neck region, two in the upper extremities, and one on the trunk. Clinically, the angiomatous lesions appeared as elevated plaques, flat lesions with papular and macular areas, or erythematous plaques with small nodules. In four cases a biopsy was done, and in one case the tumour was excised. Histologically, the neoplasms were characterized by irregularly distributed vascular tufts in the dermis, and, in one case, in the upper subcutis. The vascular tufts were composed of plump endothelial cells and spindle-shaped pericytes surrounded by crescent-shaped vascular spaces. The positive staining for CD 31 and for CD 34 and alpha-smooth muscle actin, and the negative staining of endothelial cells for factor VIII underline both the existence of two cellular components in tufted angioma and the immaturity of endothelial cells. Evidence of regular mitotic figures in two cases and increased proliferative activity in three out of four cases tested, emphasize the neoplastic nature of slowly growing tufted angioma. Benign tufted angioma is a distinct entity in the spectrum of capillary haemangiomas and must be distinguished from other vascular neoplasms.
    Notes: Zusammenfassung Es werden fünf Patienten, zwei weibliche und drei männliche Patienten mit einem büschelartigen Hämangiom („tufted angioma“) vorgestellt. Das Alter der Patienten lag zum Zeitpunkt der Exzision zwischen 10 und 62 Jahren, die Läsionen waren in jeweils zwei Fällen im Kopf/Halsbereich bzw. im Bereich der oberen Extremitäten und bei einem Patienten am Körperstamm lokalisiert. Die Tumoren imponierten klinisch als erhabene Plaques, als flache Tumoren mit papulösen und makulären Arealen oder als erythematöse Plaques mit kleinknotigen Anteilen. Vier der Läsionen wurden bioptiert, bei einer Patientin wurde eine operative Entfernung der Läsion mit anschließender plastischer Deckung vorgenommen. Die fünf Tumoren waren histologisch durch irregulär in der Dermis bzw. in einem Fall auch in der oberen Subkutis verteilte, vaskuläre Lobuli gekennzeichnet, die aus plumpen Endothelien und spindeligen Perizyten bestanden und immer wieder von gekrümmten vaskulären Spalträumen unvollständig umfaßt wurden. Die Immunpositivität für CD 31 bzw. CD 34 und alpha-glattmuskulärem Aktin bei Negativität der endothelialen Zellen gegenüber Faktor VIII assoziiertem Antigen verdeutlichen das Vorhandensein zweier zellulärer Komponenten im büschelartigen Hämangiom und die Unreife der endothelialen Tumorzellen. Der Nachweis von regulären Mitosefiguren in zwei Fällen und die erhöhte proliferative Aktivität in drei von vier untersuchten Fällen in den vaskulären Lobuli unterstreichen die neoplastische Natur des klinisch häufig langsam progredienten büschelartigen Tumors. Das benigne büschelartige Hämangiom stellt eine distinkte Entität im Spektrum der kapillären Hämangiome dar und muß von weiteren vaskulären Läsionen unterschieden werden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The SYRMEP (synchrotron radiation in medical physics) Collaboration is planning to use a beam of monochromatic x-rays provided by Elettra, the synchrotron radiation facility in operation at Trieste (Italy), in conjunction with a novel silicon pixel detector to conduct research in digital mammography. A beamline dedicated to mammography is presently under construction in Trieste; it will provide, at a distance of about 20 m from an Elettra bending magnet, a monochromatic laminar-section (150×4 mm2) x-ray beam. This beam will illuminate in vitro samples and will be detected by a fixed silicon microstrip device forming a matrix of pixels. Digital images of phantoms having a size common in the diagnostic practice (150×150 mm2), can then be produced by scanning the sample itself in front of the detector. A prototype detector with a sensitive area of 24×1 mm2 and pixels of 0.5×0.5 mm2 has been built and tested. We present the current status of the SYRMEP beamline and a digital image of a mammographic phantom exposed to a radioactive x-ray source. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Experiments in fluids 23 (1997), S. 202-208 
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  In this paper we present a non intrusive device to detect the inception of sediment transport and to measure bed load in low-submergence flows. A solid state linear CCD camera provides linear images of the sediment movements across a control section, located on the bottom of a laboratory flume. These arrays of information are reassembled to provide a raster image of the bottom of the flume in correspondence of the control section. An on-line operating image processing software counts the number of grains and evaluates their velocity.
    Type of Medium: Electronic Resource
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