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Carcinoid of Thymus : Histologic Features

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Histologic Features: Microscopically, thymic carcinoids are composed of a uniform population of polygonal tumor cells with small round regular nuclei, finely granular chromatin and pale eosinophilic cytoplasm. By definition, there is no necrosis and mitotic activity is low. The tumor cells form trabeculae, rosettes, festoons, solid nests (shown here), and glandular structures. The tumor cells are separated by a delicate vascular stroma.

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