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  • 1995-1999  (2)
  • Abrikossoff-Tumor.  (1)
  • Excitons and related phenomena (including electron-hole drops)  (1)
  • 1
    ISSN: 1433-0385
    Keywords: Key words: Benign esophageal tumor ; Thoracoscopic excision ; Granular cell tumor ; Abrikossoff tumor. ; Schlüsselwörter: Gutartige Oesophagustumoren ; thoracoskopische Operation ; Granularzelltumor ; Abrikossoff-Tumor.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Granularzelltumoren (GCT) gehören zu den selteneren Tumoren des Oesophagus. Wir präsentieren den Fall eines 65 jährigen Patienten, bei dem im Rahmen der Routinediagnostik vor geplanter Cholecystektomie bei der Gastroskopie ein intramuraler Oesophagustumor diagnostiziert wurde, welcher ein Jahr lang persistierte. Durch mehrfache Biopsien konnte die Dignität nicht geklärt werden. Endosonographisch war keine klare Abgrenzung zur Tunica muscularis möglich, eine risikolose endoskopische Entfernung erschien daher nicht möglich. Der Tumor wurde schließlich auf thoracoskopischem Wege entfernt. Histologisch handelte es sich um einen GCT (sog. Abrikossoff-Tumor). Obwohl der Tumor nahezu unverändert persistierte, erschien aufgrund der unklaren Dignität die Thoracoskopie als risikoarmes Verfahren gerechtfertigt. In der Behandlung des GCT der Speiseröhre ist eine Tendenz zu konservativer Therapie oder endoskopischer Entfernung zu erkennen. Die Diskussion erfolgt jeweils in der Literaturübersicht.
    Notes: Summary. A granular cell tumor is one of the rare tumors of the esophagus. We present the case of a 65-year-old male patient, who was admitted to our hospital for an elective cholecystectomy. In the routine diagnostic gastroscopy an intramural tumor in the distal esophagus was incidentally found. Repeated endoscopic biopsies did not reveal the histologic diagnosis, although endoscopic ultrasound invasion to the tunica muscularis could not be excluded. After indicating the operative therapy, the tumor was removed through a thoracoscopic approach. The histologic specimen showed a granular cell tumor of the esophagus (tumor of Abrikossoff). Since the tumor grade was unknown, our therapy seemed to be justified because of the low risk involved in minimally invasive operative procedures. There has been much discussion and controversy in the literature on this subject, including the potential for malignancy and the correct therapy regime, with a general shift to conservative or minimally invasive treatment. The case is discussed with a review of the literature.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1759-1762 
    ISSN: 0392-6737
    Keywords: Optical transient phenomena (including quantum beats, dephasings and revivals, photon echoes, free induction decay, and optical mutation) ; Excitons and related phenomena (including electron-hole drops) ; Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Optical properties of thin films, surfaces and thin layer structures (including superlattices, heterostructures, and intercalation compounds) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We study exciton ionization induced by an axial electric field in a strongly coupled GaAs/Al0.3 Ga0.7 As superlattice at low temperatures. The field-induced ionization times of the heavy-hole 1s exciton in the miniband field regime are determined from transient four-wave-mixing experiments and theoretical model calculations. They are found to lie between the field ionization times of excitons in bulk semiconductors, and in strongly confined quantum well systems.
    Type of Medium: Electronic Resource
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