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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 17 (1996), S. 195-201 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter CD34 ; Weichgewebstumoren ; Differentialdiagnose ; Solitärer fibröser Tumor ; Dermatofibrosarcoma protuberans ; Gastrointestinaler Stromatumor ; Key words CD34 ; Soft tissue tumors ; Differential diagnosis ; Solitary fibrous tumor ; Dermatofibrosarcoma protuberans ; Gastrointestinal stromal tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary CD34 is a myeloid progenitor cel antigen and present in endothelial cells and almost all vascular lesions. Additionally, CD34 has been described in numerous fibroblast-like cells and different mesenchymal tumours. The immunohistochemical evidence of CD34, however, may be of importance in the differential diagnosis of benign and malignant soft tissue lesions, if clinicopathological features and other immunohistochemical markers are regarded properly. We studied the CD34 immunopositivity of solitary fibrous tumour at different sites (11 out of 11 tumours tested stained positive), dermatofibrosarcoma protuberans (15 out of 18 stained positive), and gastrointestinal stromal tumour (15 out of 15 stained positive), and discuss the significance of these results in differential diagnosis to morphologically comparable soft tissue lesions.
    Notes: Zusammenfassung Das CD34-Antigen ist ein Stammzellmarker der Myelopoese und markiert endotheliale Zellen und damit fast alle vaskulären Neubildungen. Des weiteren wurde CD34 in zahlreichen fibroblastenähnlichen Zellen und in einer Reihe mesenchymaler Tumoren unterschiedlicher Differenzierung nachgewiesen. Trotz dieses ubiquitären Vorkommens kann der Nachweis des CD34-Antigens Bedeutung in der Differentialdiagnose benigner und maligner Tumoren des Weichgewebes haben, wenn die entsprechenden klinisch-pathologischen und die weiteren immunhistochemischen Befunde beachtet werden. Anhand von 3 Fallserien wird die CD34-Positivität des solitären fibrösen Tumors unterschiedlicher Lokalisation (11 von 11 untersuchten Tumoren reagierten positiv), des Dermatofibrosarcoma protuberans (15 von 18 der untersuchten Tumoren reagierten positiv) und des gastrointestinalen Stromatumors (15 von 15 der untersuchten Tumoren reagierten positiv) dargestellt und bezüglich ihrer differentialdiagnostischen Wertigkeit diskutiert.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Lipom ; Chondroides Lipom ; Liposarkom ; Chondrosarkom ; Weichgewebstumoren ; Key words Lipoma ; Chondroid lipoma ; Liposarcoma ; Chondrosarcoma ; Soft tissue tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A series of six cases of chondroid lipoma is reported in this paper. The age of the patients, four women and two men, ranged from 34 to 75 years. Four tumours arose in the lower and two in the upper extremities between 4.5 and 8 cm in size. Whereas two neoplasms were located in the subcutis, four lesions were seen in perifascial or intramuscular tissues. Histologically, all neoplasms were encapsulated and characterized by a somewhat lobular growth pattern. The neoplasms were composed of mature adipocytes, uni – and multivacuolated lipoblasts, and nests and strands of cells reminiscent to hibernoma cells or chondrocytes. Immunohistochemically and ultrastructurally the lipogenic nature of the latter type of cells was confirmed. Interestingly, focal immunopositivity of tumour cells for cytokeratin was found in two cases. Tumour cells were set in a myxohyaline matrix showing different degrees of degeneration. Chondroid lipoma represents a distinct entity in the spectrum of lipomatous lesions and has to be distinguished from benign and malignant neoplasms (extraskeletal chondroma, hibernoma, lipoblastoma, chondrolipoangioma, myoepithelioma, myxoid/round cell liposar-coma, and extraskeletal myxoid chondrosar-coma). Because they are easily misdiagnosed as malignant tumours, familiarity with the features of chondroid lipoma is of practical importance to avoid an overtreatment.
    Notes: Zusammenfassung Es werden 4 weibliche und 2 männliche Patienten mit einem chondroiden Lipom vorgestellt. Das Alter der Patienten lag zum Zeitpunkt der Tumorexzision zwischen 34 und 75 Jahren, die Neoplasien waren im Extremitätenbereich lokalisiert (4mal untere, 2mal obere Extremität). Bei einer Tumorgröße von 4,5 bis 8 cm fanden sich 2 Geschwülste im subkutanen und 4 im tiefen, perifaszialen bzw. intramuskulären Weichgewebe. Alle Neoplasien wurden mit tumorfreien Resektionsrändern komplett exzidiert, bei keinem der Patienten trat ein Lokalrezidiv auf. Histologisch stellten sich in allen Fällen gekapselte und angedeutet lobulär konfigurierte Tumoren dar, die aus reifen Adipozyten, uni- und multivakuolären Lipoblasten sowie in Bändern oder Nestern angeordneten hibernom – oder knorpelzellähnlichen Tumorzellen bestanden. Immunhistochemisch und ultrastrukturell konnte die lipogene Natur der Tumorzellen abgesichert werden. Bemerkenswerterweise war bei zwei Tumoren immunhistochemisch eine fokale Zytokeratinpositivität zu finden. Die Tumorzellen waren in einer myxohyalinen Matrix mit unterschiedlich stark ausgeprägten, teilweise prominenten degenerativen Veränderungen gelagert. Das chondroide Lipom stellt eine distinkte Entität im Spektrum der Lipome des Weichgewebes dar, differentialdiagnostisch sind verschiedene benigne und maligne Tumoren zu bedenken (extraskeletales Chondrom, Hibernom, Lipoblastom, Chondrolipoangiom, Myoepitheliom, myxoid/rundzelliges Liposarkom, extraskeletales myxoides Chondrosarkom). Da eine Verwechslungsgefahr insbesondere mit malignen mesenchymalen Tumoren besteht, ist die Kenntnis des chondroiden Lipoms zwecks Vermeidung einer Übertherapie von erheblicher Bedeutung.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2307
    Keywords: Key words Angiosarcoma ; Epithelioid angiosarcoma ; Intravascular angiosarcoma ; ”Intimal” sarcoma ; Soft tissue tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Angiosarcomas are rare malignant mesenchymal tumours, characterized morphologically by anastomosing vascular channels lined by atypical and proliferative active endothelial cells. An epithelioid cytomorphology of tumour cells is often seen focally in angiosarcoma, whereas purely epithelioid angiosarcomas are rare. Although angiosarcomas show a vascular differentiation they are almost never confined to pre-existing blood vessels. We describe three cases of intravascular epithelioid angiosarcoma arising in the carotid artery of a 60-year-old man, in the infrarenal part of the abdominal aorta and both renal arteries of a 69-year-old woman, and in the abdominal aorta of a 68-year-old man. In all cases malignant tumour tissue was found incidentally after disobliteration of thrombosed vessels. Histologically, purely epithelioid angiosarcoma composed of solid sheets of epithelioid tumour cells was seen; immunohistochemistry confirmed the endothelial differentiation of neoplastic cells. The reported cases show that angiosarcoma can occasionally arise within a pre-existing vessel.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 436 (2000), S. 305-311 
    ISSN: 1432-2307
    Keywords: Key words Rhabdomyosarcoma ; Soft tissue tumours ; Adults ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Rhabdomyosarcoma in adults represents a rare soft tissue neoplasm which is seen most frequently in its pleomorphic subtype in this age group. Very rarely, clear cell and spindle-cell variants have been reported. In this study we describe three cases of rhabdomyosarcoma in adult patients, characterised by prominent hyaline sclerosis and a pseudovascular growth pattern. All cases were identified in the consultation files of one of the authors and routinely processed. Immunohistochemical studies were performed on paraffin sections with the alkaline phosphatase–antialkaline phophatase method. The patients, two women and one man, were 40, 41, and 56 years old. One developed a deep-seated soft tissue mass in the left lower leg, and one, a tumour of the left upper jaw. In one patient a bone tumour in the proximal body of the sacrum without extension into soft tissues was seen. The patients were treated by wide excision, piecemeal excision and incomplete excision in one case each; additional radiotherapy was performed in all three cases, and chemotherapy in two patients. In one patient multiple pulmonary metastases were noted, which showed progression despite systemic chemotherapy. Histologically, the neoplasms were composed of round/polygonal and spindle-shaped tumour cells including typical rhabdomyoblasts. In all cases a pseudovascular pattern and prominent hyaline sclerosis of the intercellular matrix was seen. Immunohistochemically, tumour cells stained positively for desmin and muscle actin (HHF35) and also for markers of striated muscle differentiation (myogenin, MyoD1, fast myosin). In this paper an unusual morphological variant of rhabdomyosarcoma arising in adult patients is described, which should be added to the morphological spectrum of these neoplasms.
    Type of Medium: Electronic Resource
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