Neoplasms in Struma Ovarii: A Review

Area of Science:

• Gynecologic Pathology
• Endocrine Pathology
• Oncologic Pathology

Background:

• Struma ovarii is a germ cell tumor composed of mature thyroid tissue, typically benign.
• While predominantly benign, struma ovarii can rarely present with malignant transformation.
• Accurate diagnosis is crucial for appropriate patient management and prognosis.

Purpose of the Study:

• To review common malignancies associated with struma ovarii.
• To highlight the diagnostic utility of specific immunohistochemical markers.
• To aid pathologists in the accurate diagnosis of malignant struma ovarii.

Main Methods:

• Review of literature on struma ovarii and its malignant counterparts.
• Discussion of key histopathological features of common struma ovarii malignancies.
• Emphasis on immunohistochemical staining, particularly TTF1, PAX8, and thyroglobulin.

Main Results:

• Common malignant components include papillary thyroid carcinoma, strumal carcinoid, and follicular thyroid carcinoma.
• Immunohistochemistry, especially TTF1, is vital for distinguishing thyroid tissue from ovarian epithelium.
• Normal thyroid tissue in struma ovarii shows characteristic staining for TTF1, PAX8, and thyroglobulin.

Conclusions:

• Malignant transformation in struma ovarii requires careful histopathological evaluation.
• TTF1 staining is a critical tool for differentiating struma ovarii malignancies from ovarian neoplasms.
• This review provides a concise guide for pathologists managing complex struma ovarii cases.