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Abstract:
Oat-cell carcinoma of the thymus gland is exceedingly rare as a primary lesion, and only a few cases have been reported. We report a case in which a neoplasm interpreted as an oat-cell carcinoma was intimately associated with and arose in transition from a carcinoid tumor of the thymus. Ultrastructural features of this lesion were unusual compared with previous descriptions of thymus neuroendocrine neoplasms.