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Immunohistochemical and fine structural characterization of primary carcinoid tumors of the larynx

European Archives of Oto-Rhino-Laryngology volume 252, pages 229–235 (1995)Cite this article

Abstract

Carcinoid tumors belong to the group of neuroendocrine tumors of epithelial origin, i.e., neuroendocrine carcinomas. These neoplasms usually occur in the gastrointestinal tract or bronchial system but are very rare neoplasms in the larynx. Since carcinoid tumors in this latter site may appear to be undifferentiated by light microscopy, they may possibly be misinterpreted and their neuroendocrine characteristics may remain unrecognized. Using immunohistochemical methods, three carcinoid tumors were studied and showed positive immunostaining for markers of epithelial origin (cytokeratins, epithelial membrane antigen, carcino-embryonic antigen) and, in particular, for markers of neuroendocrine differentiation (chromogranin, synaptophysin, neuron-specific enolase). All tumors expressed calcitonin-, serotonin- and adrenocorticotropic-hormone-like immunoreactivity. In contrast, three poorly differentiated squamous cell carcinomas showed positive immunostaining for epithelial markers but did not show any immunoreactivity with markers of endocrine characteristics. Fine structurally, carcinoid tumor cells contained neurosecretory-type granules scattered throughout the cytoplasm. The present study demonstrated that (1) carcinoid tumors of the larynx possess distinct immunohistochemical characteristics that allow a clear classification, (2) it is advisable to use a battery of primary antibodies rather than rely on specificity and sensitivity of a single marker to establish diagnosis and (3) the fine structural demonstration of neurosecretory-type granules serves as a reliable adjunct to diagnosis.

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Affiliations

  1. Department of Otolaryngology-Head and Neck Surgery, University of Wurzburg, Josef-Schneider-Strasse 11, D-97080, Wurzburg, Germany

    R. Dieler

  2. Department of Pathology, University of Würzburg, Josef-Schneider-Strasse 11, D-97080, Würzburg, Germany

    J. Dämmrich

Authors
  1. R. Dieler
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  2. J. Dämmrich
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Dieler, R., Dämmrich, J. Immunohistochemical and fine structural characterization of primary carcinoid tumors of the larynx. Eur Arch Otorhinolaryngol 252, 229–235 (1995). https://doi.org/10.1007/BF00179916

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  • DOI: https://doi.org/10.1007/BF00179916

Key words

  • Larynx
  • Neuroendocrine carcinoma
  • Carcinoid tumor
  • Immunohistochemistry
  • Electron microscopy