Summary
A bronchial carcinoid with globular intracytoplasmic inclusions is reported. The inclusions stain brown with Grimelius silver impregnation and some show distinct immunoreactivity for chromogranin A. Tumour cells stain positively with antisera to neuron specific enolase, chromogranin A and not with antisera against ACTH, somatostatin or S-100 protein. The cells show distinct immunoreactivity for cytokeratins and vimentin, which is particularly intense in the intracytoplasmic inclusions. Desmin and glial fibrillary acidic protein are absent. Ultrastructural analysis reveals that the inclusions are composed of aggregates of filaments of 8–10 nm of diameter, intrapping a few neurosecretory granules. Immunohistochemical and ultrastructural data support the hypothesis that the inclusions are composed of intermediate filaments, whose metabolism and synthesis have somehow been deranged.
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Barbareschi, M., Frigo, B., Cristina, S. et al. Bronchial carcinoid with paranuclear fibrillary inclusions related to cytokeratins and vimentin. Vichows Archiv A Pathol Anat 415, 31–37 (1989). https://doi.org/10.1007/BF00718602
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DOI: https://doi.org/10.1007/BF00718602