117 research outputs found

    Operative Therapie von akral lokalisierten Melanomen

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    Zusammenfassung: Akrolentiginöse Melanome (ALM) umfassen 4-10% der kutanen Melanome bei Hellhäutigen. Patienten mit ALM wird oft eine schlechtere Prognose zugeschrieben, meist aufgrund zu später Diagnosestellung. Unter Einsatz der 3D-Histologie können akral lokalisierte Melanome mit kontinuierlichem Ausbreitungsmuster lokal chirurgisch mit kleineren Sicherheitsabständen und einem guten funktionellen und kosmetischen Ergebnis behandelt werden. In einer Studie wurden bei 244Patienten mit ALM die konventionelle Histologie vs. 3D-Histologie neben anderen prognostischen Parametern verglichen. Klinische und chirurgische Risikofaktoren beeinflussen die Prognose des ALM. Tumordicke und Ulzeration sind die wichtigsten Risikofaktoren. Die 3D-Histologie in Paraffintechnik ermöglicht es, Sicherheitsabstände zu reduzieren und Lokalrezidive zu vermeiden. Subunguale Melanome machen nur etwa 2-3% der kutanen Melanome beim kaukasischen und etwa 20% der Melanome beim afrikanischen oder asiatischen Hauttyp aus und werden klinisch häufig fehldiagnostiziert. Sie sind oft an Daumen und Großzehe lokalisiert. Die Entfernung von subungualen Melanomen mit 3D-Histologie und tumorfreien Schnitträndern unter Einschluss der Nagelmatrix kann als sichere Strategie angesehen werden, welche die Prognose nicht beeinträchtigt. Funktion und Kosmetik eines Fingers oder Zehs bleiben erhalten. Amputationen bei subungualen Melanomen sollten fortgeschrittenen Verläufen mit Knochen- oder Gelenkbefall vorbehalten bleibe

    Calibration of multi-layered probes with low/high magnetic moments

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    We present a comprehensive method for visualisation and quantification of the magnetic stray field of magnetic force microscopy (MFM) probes, applied to the particular case of custom-made multi-layered probes with controllable high/low magnetic moment states. The probes consist of two decoupled magnetic layers separated by a non-magnetic interlayer, which results in four stable magnetic states: ±ferromagnetic (FM) and ±antiferromagnetic (A-FM). Direct visualisation of the stray field surrounding the probe apex using electron holography convincingly demonstrates a striking difference in the spatial distribution and strength of the magnetic flux in FM and A-FM states. In situ MFM studies of reference samples are used to determine the probe switching fields and spatial resolution. Furthermore, quantitative values of the probe magnetic moments are obtained by determining their real space tip transfer function (RSTTF). We also map the local Hall voltage in graphene Hall nanosensors induced by the probes in different states. The measured transport properties of nanosensors and RSTTF outcomes are introduced as an input in a numerical model of Hall devices to verify the probe magnetic moments. The modelling results fully match the experimental measurements, outlining an all-inclusive method for the calibration of complex magnetic probes with a controllable low/high magnetic moment

    Facial papules and pneumothoraces. Birt-Hogg-Dube syndrome

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    A 43-year-old man presented with white to skin-colored shiny papules on the face and neck. In addition, he had a positive family history and reported on multiple pneumothoraces. Histopathological examination revealed a papular mucinosis. Considering these findings, we made the diagnosis of Birt-Hogg-Dub, syndrome (BHDS) that was confirmed by molecular genetic analysis. This autosomal dominantly inherited tumor disorder is caused by germline mutations in the folliculin (FLCN) gene that encodes for the eponymous protein folliculin. Clinically, BHDS is predominantly characterized by the occurrence of fibrofolliculomas and trichodiscomas. A papular mucinosis, as encountered in our patient, has been described only once previously. Besides the cutaneous symptoms the disease can be associated with lung cysts and pneumothoraces as well as the development of benign and malignant kidney tumors. Following confirmation of BHDS on the DNA level, all patients with multiple cutaneous fibrofolliculomas should be treated in an interdisciplinary setting and undergo regular prophylactic screening examinations due to the association with renal cell carcinomas

    Nodular malignant melanoma and multiple cutaneous neoplasms under immunosuppression with azathioprine.

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    Immunosuppressed patients are at increased risk of skin cancer. A 67-year-old renal transplant recipient developed a nodular malignant melanoma after 30 years of immunosuppression with azathioprine and prednisolone. The patient died of metastatic disease 3 months after the diagnosis was made. The function of the renal graft was not affected at all. Renal transplant recipients are at high risk of developing nonmelanocytic skin tumors when on immunosuppressive therapy with cyclosporine A. Less common is the development of skin cancer during immunosuppression with azathioprine. Latest reports show the increased incidence of malignant melanoma in immunosuppressed patients. Our case illustrates the necessity of close dermatological surveillance of allograft recipients, to assure an early recognition of any malignant skin tumor and to reduce the risk of systemic metastatic disease

    Verbesserung der Arbeitsbedingungen in einer Fliessadjustage - sozialwissenschaftliche Begleitforschung Schlussbericht

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    With 24 refs., 186 tabs., 9 figs.Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
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