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Malignant struma ovarii. Light and electron microscopic study.

F J Pardo-Mindan, J J Vazquez

    Cancer
    |January 15, 1983
    PubMed
    Summary
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    Malignant struma ovarii, a rare ovarian tumor, can present with extensive metastases. Ultrastructural analysis is key to distinguishing it from other ovarian cancers.

    Area of Science:

    • Gynecologic Oncology
    • Pathology
    • Endocrinology

    Background:

    • Malignant struma ovarii is an exceptionally rare ovarian neoplasm characterized by malignant transformation within a struma ovarii.
    • Previous reports of malignant struma ovarii with metastases are limited, with only 17 cases documented.

    Observation:

    • This report details a unique case of malignant struma ovarii affecting both ovaries and resulting in multiple metastases.
    • Microscopic and ultrastructural examination revealed features identical to mixed papillary and follicular thyroid carcinoma.

    Findings:

    • Key ultrastructural findings include surface and cytoplasmic microvilli, oncocytic cellular changes, and the presence of colloid within follicles and vacuoles.
    • The patient's thyroid gland exhibited no abnormalities, underscoring the ovarian origin of the malignancy.

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    Implications:

    • Diagnosis of malignant struma ovarii necessitates the exclusion of a primary thyroid carcinoma.
    • Ultrastructural pathology offers critical diagnostic criteria to differentiate malignant struma ovarii from strumal carcinoid and serous adenocarcinoma.