Malignant struma ovarii is extremely rare and difficult to diagnose histologically, particularly in cases of follicular carcinoma. This case study is intended to describe three cases of follicular proliferative lesion arising in struma ovarii that we experienced. The first case was clearly malignant given the clinical picture of multiple recurrences, but there was little histological evidence of malignancy. Our second case featured architectural and cellular atypia and necrosis and was diagnosed as malignant despite the absence of vascular and stromal invasion. Our third case exhibit-ed solid microfollicular proliferation without any definite evidence of malignancy (even the molecular data was negative); however, we could not completely exclude malignant potential after conducting a literature review. In cases such as our third case, it has been previously suggested that a diagnostic term recognizing the low-grade malignant potential, such as “proliferative stromal ovarii” or “follicular proliferative lesion arising in the stromal ovarii” would be appropriate.
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Role of gene sequencing in classifying struma ovarii: BRAF p.G469A mutation and TERT promoter alterations favour malignant struma ovarii Sophie Neyrand, Alexis Trecourt, Jonathan Lopez, Pierre Alexandre Just, Françoise Descotes, Françoise Borson‐Chazot, Isabelle Ray‐Coquard, Myriam Decaussin‐Petrucci, Mojgan Devouassoux‐Shisheboran Histopathology.2024; 84(2): 291. CrossRef
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Malignant struma ovarii presenting with follicular carcinoma: A case report with molecular analysis Takafumi Tsukada, Hiroshi Yoshida, Mitsuya Ishikawa, Yuka Asami, Kouya Shiraishi, Tomoyasu Kato Gynecologic Oncology Reports.2019; 30: 100498. CrossRef
A Rare Case: Struma Ovarii in a 14-Year-Old Girl Elif Iltar, Isin Ureyen, Tayfun Toptas, Melike Savas, Sema Çekiç, Aysel Uysal Journal of Adolescent and Young Adult Oncology.2018; 7(1): 134. CrossRef
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Malignant struma ovarii is a rare tumor of the ovary. This can be diagnosed by histologically when carcinomas of the thyroid gland are excluded. We present a case of malignant struma ovarii arising from cystic teratoma. A 42-year-old female was admitted for evaluation of lower abdominal mass.
Hysterectomy and both adnexectomy were performed on the basis of a clinical impression of uterine leiomyoma and an ovarian mass. The uterus revealed intramural leiomyoma, measuring 8 cm in diameter. Ovarian mass was predominantly cystic and partly solid. Microscopically, thyroid tissue with papillary structures were found in the solid area Papillae were complex, branching and randomly oriented.
These papillae were infiltrated in the adjacent fibrous capsule, Clinical evidence of a primary thyroid carcinoma was not found.