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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytical Biochemistry 120 (1982), S. 38-45 
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Zoologica Scripta 16 (1987), S. 9-17 
    ISSN: 0300-3256
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Zoologica Scripta 2 (1973), S. 183-195 
    ISSN: 0300-3256
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-0458
    Keywords: Key words Glandula parotis ; Basalzelladenokarzinom ; Pathogenese ; Differentialdiagnose ; Therapie ; Key words Parotid gland ; Basal cell adenocarcinoma ; Pathogenesis ; Differential diagnosis ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Basal cell adenocarcinoma is a rare entity that was first defined as a malignant salivary gland tumor in 1991. We present another case report and discuss pathology, pathogenesis, differential diagnosis, therapy and prognosis on the basis of currently available literature. Although histomorphologic features of the tumors are similar to basal cell adenomas, proof of an infiltrative and destructive growth is essential for diagnosis. Adenoid cystic carcinoma and basaloid squamous carcinoma must also be considered in any differential diagnosis. Tumor development within a pre-existing basal cell adenoma and de novo development are discussed. Most of the tumors appear to be benign clinically. Facial pain is rare and facial nerve palsy was noted in only one case. Metastases have occurred in less than 10% of patients, with only one involving the lung. Due to their biologic behavior and prognosis, basal cell adenocarcinomas should be classified as low-grade carcinomas. The therapy of choice is parotidectomy with preservation of the facial nerve. Neck dissection has to be added in cases with cervical metastases. Radiation is advisable in patients with recurrent disease. Since there is a nearly 30% local recurrence rate, intensive follow-up is necessary.
    Notes: Zusammenfassung Basalzelladenokarzinome sind seltene maligne Speicheldrüsentumoren, die seit 1991 eine eigene Entität darstellen. Anhand eines eigenen Falles und vor dem Hintergrund der Literatur diskutieren wir Fragen der Pathologie, Pathogenese, Differentialdiagnose, Klinik und Therapie. Wegen der meist großen histomorphologischen Ähnlichkeit mit Basalzelladenomen ist der Nachweis von infiltrierendem Tumorwachstum für die Diagnose entscheidend. Auch der solide Typ des adenoidzystischen Karzinoms und das basaloide Plattenepithelkarzinom müssen differentialdiagnostisch abgegrenzt werden. Pathogenetisch wird sowohl eine De-novo-Genese als auch eine Malignomentwicklung in einem vorbestehenden Basalzelladenom diskutiert. Das klinische Bild sowie bildgebende Untersuchungsverfahren lenken den Verdacht zumeist auf einen benignen Parotistumor. Schmerzen sind selten, eine Fazialisparese wird in einem Fall berichtet, Metastasen in weniger als 10%, davon einmal in der Lunge. Basalzelladenokarzinome zählen zu den niedrig-malignen Parotistumoren mit einer guten Prognose. Die Therapie der Wahl besteht in einer Parotidektomie unter Schonung des N. facialis, die ggf. durch eine Neck dissektion ergänzt wird. Eine Nachbestrahlung sollte bei Auftreten eines Rezidivs erwogen werden. Angesichts einer lokalen Rezidivrate von nahezu 30% ist eine engmaschige Nachsorge unerläßlich.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    HNO 47 (1999), S. 912-917 
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Kleinzellige Karzinome ; Extrapulmonale Primärtumoren ; Kopf-Hals Bereich ; Metastase ; Key words Small cell carcinoma ; Extrapulmonary primary malignancies ; Head and neck tumors ; Metastatic tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Extrapulmonary small cell carcinomas are recognized as a clinicopathologic entity distinct from small cell lung cancer. Such carcinomas as primary tumors have been described in several locations in the head and neck although most cases of metastatic tumor in the neck originate from a pulmonary primary. In this report we present a small cell carcinoma of the larynx, metastasis in the parotid gland as the first manifestation of a small cell lung cancer and a small cell carcinoma of the Merkel cell type in a parotid lymph node. Our review of the current literature shows that most small cell carcinomas in the head and neck are extrapulmonary primary tumors. Since histological criteria are the same, a pulmonary neoplasm has to be excluded in every case. The differentiation between a primary head and neck tumor and metastatic disease as well as the location and staging are essential criteria for therapy and prognosis.
    Notes: Zusammenfassung Extrapulmonale kleinzellige Primärtumoren kommen in zahlreichen Lokalisationen in der Kopf-Hals-Region vor. Zudem können die Kopf-Halsorgane Zielorte der Metastasierung zumeist bronchialer Primärtumoren sein. Wir stellen ein primäres Larynxkarzinom, die Metastase eines kleinzelligen Karzinoms in der Glandula parotis, die zur Diagnose eines Bronchialkarzinoms führte, und ein kleinzelliges neuroendokrines Karzinom vom Merkelzell-Typ in einem Lymphknoten der Glandula parotis vor. Auch wenn die meisten kleinzelligen Karzinome im HNO-Bereich Primärtumoren sind, muß im Einzelfall immer ein Primärtumor insbesondere bronchialen Ursprungs ausgeschlossen werden. Die Unterscheidung zwischen Primärtumor und Metastase sowie die Lokalisation eines Primärtumors im HNO-Bereich sind für Therapie und Prognose entscheidend.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zoomorphology 104 (1984), S. 140-146 
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Differentiation of spermatids to mature spermatozoa in the bryozoan Tubulipora liliacea was studied by transmission electron microscopy. The spermatozoon of Tubulipora is of a filiform, modified type, and has evolved from the primitive type as an adaptation to a specialized biology of fertilization. The head of the spermatozoon consists of a small, conical acrosome capping an elongated, cylindrical, anteriorly tapering nucleus. A basal invagination in the nucleus contains the proximal portion of the axoneme and a dense attachment matrix. The flagellar axoneme has the typical 9+2 structure. Four elongated rodshaped mitochondria with typical cristae surround the axoneme in the cylindrical middle piece. Granular electron-dense material is accumulated in the form of four columns alternating with four long cylindrical mitochondria. The mitochondrial middle piece is separated externally from the tail region by an involution of the plasma membrane. The tail region contains a cytoplasmic sheath with accessory fibers surrounding the axoneme. Nine outer, coarse fibers extend posteriorly paralleling the nine doublets of the axoneme. The coarse fibers develop from electron-dense plate-like structures associated with the doublets of the axoneme. A characteristic feature in spermiogenesis is that spermatozoa develop in tetrads. There seem to be significant differences in spermatozoan ultrastructure between the three bryozoan classes Stenolaemata, Gymnolaemata, and Phylactolaemata. The differences indicate different lines of evolution of fertilization biology in these groups.
    Type of Medium: Electronic Resource
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