Adenocarcinoma of the Larynx: a Case Report With Histochemical and Immunohistochemical Studies

Abstract

Adenocarcinomas constitute a histologically diverse group of rare laryngeal neoplasms accounting in aggregate for less than 1% of all laryngeal carcinomas. Adenocarcinoma of the larynx "not otherwise specified" (NOS) is a very uncommon neoplasia, but it shows a high degree of malignancy. We report a case of adenocarcinoma "NOS" arising in the larynx of a 60-year-old man. Histologically, the tumor tissue was composed of only adenocarcinoma component. Histochemically, the adenocarcinoma cells demonstrated Alcian blue pH: 2.5 and PAS reactivity, but did not include argentaffin and argyrophil granules. Immunohistochemical studies revealed negative reactivity for desmin, HMB45 and NSE. S-100 and chromogranin was focally positive, cytokeratin was diffusely positive.