Abstract
The case of a 58‐year‐old Japanese female with strumal carcinoid of the ovary is described. Ultrastructural examinations revealed numerous neurose‐cretory‐type granules in the cytoplasm of both thyroid and carcinoid components. Immunohistochemical studies showed immunoreactivities for thyroxin and thyroglobulin in the thyroid component. Several mucous glands were also observed in the tumor tissue. These morphological findings suggested that the follicles in the thyroid component were lined with thyroid follicular, carcinoid and mucous cells, and also supported the theory that this tumor may be derived from multidirectional differentiations of endodermal origin.
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