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  • Electron Microscopy  (2)
  • Granulomatose  (1)
  • Neurofibrome  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 379 (1978), S. 73-83 
    ISSN: 1432-2307
    Keywords: Neurofibrome ; Tactile-like corpuscles ; Perineurial cell ; Neuroectodermal origin ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In neurofibromas type I (plexiform) and type II (diffuse) the Schwann cell is the predominant cell in the neoplastic proliferation. Electron microscopic investigation of a neurofibroma with structures resembling tactile corpuscles (type III) revealed neoplastic proliferation of perineurial instead of Schwann cells. The tactile-like (pseudo-Meissnerian) corpuscles (corpuscules neurofibromateux) are formed by neoplastic perineurial cells. These cells have a tendency to wrap themselves around longitudinal structures, such as collagen fibres or axons, and to come into direct contact with the latter. This close relationship between the axon and the neoplastic perineurial cell, analogous to that between axon and Schwann cell, points to a neuroectodermal origin of the perineurial cell. The electron microscopic appearances suggest that either the Schwann cell or the perineurial cell is the essential neoplastic component of neurofibromas, the fibroblastic proliferation being a secondary phenomenon.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 378 (1978), S. 143-151 
    ISSN: 1432-2307
    Keywords: Neurinoma ; Schwannian Origin ; Neurinoma Cells ; Cytoplasmic Processes ; Peculiar Myelin Sheaths ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In benign tumours of the nerve sheath, the neurinoma clearly originates from the Schwann's cell. This can be said, because there are neurinoma cells with the typical tendency to cytoplasmic processes out of which peculiar myelin sheaths are built; these peculiar myelin sheaths wrap themselves around parts of their own neurinoma cell.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 380 (1978), S. 49-57 
    ISSN: 1432-2307
    Keywords: Granular cell tumor ; Schwannian Origin ; Phagocytozing Schwann cells ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In granular cell tumors, the granule-containing tumor cells and their processes form rounded complexes surrounded by a common bounding membrane. In the tumor, these complexes are closely related to the peripheral nerves and are seen in the perineurium and in the endoneurium. In addition, there are mixed complexes composed both of Schwann cells and granular tumor cells: the two types of cells are in close contact with each other and are also surrounded by a common bounding membrane. Furthermore, there one contacts between granular tumor cells and axons. These observations strongly suggest the existence of a relationship between Schwann cells and the cells of granular cell tumors. A comparison between the granular tumor cells and the phagocytic forms of Schwann cells reveals striking similarities: the granular cell tumor complexes are comparable with the Büngner bands of phagocytozing Schwann cells. A relationship between granular cell tumors and the phagocytozing form of Schwann cells is therefore assumed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 60 (1982), S. 311-316 
    ISSN: 1432-1440
    Keywords: Granulomatosis ; Striated muscles ; Angiitis ; Granulomatose ; quergestreifte Muskulatur ; Angiitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die lymphomatoide Granulomatose (LYG) wird als besonderes Krankheitsbild angesehen, das primär die Lungen und gelegentlich den oberen Respirationstrakt befällt. Die typischen histopathologischen Veränderungen zeigen eine nichtneoplastische lymphoproliferative Erkrankung, verbunden mit Nekrosen im infiltrierten Gewebe und mit angiodestruktiven Prozessen. Die Autoren beschreiben einen Fall, in dem die für die lymphomatoide Granulomatose typischen Veränderungen zuerst in der quergestreiften Muskulatur auftraten. In diesem Fall fanden sich multiple tumoröse Muskelinfiltrate und Infiltrate in Pharynx, Larynx, den paranasalen Sinus und in der Orbita vor der Lungeninfiltration, die 6 Monate nach dem ersten Muskelinfiltrat und 2 Monate vor dem Tod nachgewiesen wurde. Da eine primär muskuläre Manifestation der lymphomatoiden Granulomatose bis jetzt nicht beschrieben wurde, ist dieser Fall wegen seiner ungewöhnlichen Manifestation und der ausgesprochenen Therapieresistenz bemerkenswert. Die klinischen und experimentellen Daten sprechen für eine gestörte T-Zellfunktion.
    Notes: Summary Lymphomatoid granulomatosis (LYG) has been recognized as a peculiar disease which primarily affects the lungs and occasionally the upper respiratory tract. Typical histopathologic lesions present features of a nonneoplastic lymphoproliferative disorder associated with necroses of the infiltrated tissues and with angiodestructive processes. The authors observed a peculiar case in which lesions typical for LYG first developed in the striated muscles. In this case multiple tumorous muscular infiltrates and affections of the pharynx, larynx, paranasal sinuses, and orbita preceded the infiltration of the lung, which was first recognized 6 months after the first muscular infiltrate and 2 months before death. Because primary muscular manifestation of LYG has never been reported, this case is remarkable both for its unusual manifestation and for its striking irresponseveness towards therapy. Clinical and experimental data suggest impairment of T-cell functions.
    Type of Medium: Electronic Resource
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