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Morules with optically clear nuclei in ovarian borderline endometrioid tumor: Case report

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Li CC, Hirokawa M, Qian Z, Fujii Y, Ino H, Wakatsuki S, Horiguchi H, Kagawa N, Sano T. Morules with optically clear nuclei in ovarian borderline endometrioid tumor. APMIS 2002;110:783–8.

Optically clear nuclei (OCN) have been observed in morules of some neoplasms and in some conditions unrelated to the development of the morules. We first report a case of ovarian borderline endometrioid tumor (BET) showing the morules associated with OCN. The patient was a 47-year-old premenopausal woman with a left ovarian cystic tumor, atypical endometrial hyperplasia, and elevated serum levels of FSH, LH, estradiol, and CA 125. The resected ovarian tumor measured 6 cm in diameter, and showed a papillary growth. Histologically, the ovarian tumor was consistent with BET, and the morules with OCN were scattered. Immunohistochemically, OCN were proven to be rich in biotin. An aberrant nuclear expression of beta-catenin was observed in both the tumor cells and the morular cells. Our case may suggest the possibility that the appearance of OCN with or without morules in ovarian tumors is related to endometrioid differentiation of the tumor cells, and should be recognized as a diagnostic clue of ovarian endometrioid tumors. Although female sex hormones have been reported to play a role in the occurrence of OCN, the participation of beta-catenin mutation has also been suggested.
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Keywords: Ovary; biotin; borderline endometrioid tumor; immunohistochemistry; morules; optically clear nuclei

Document Type: Research Article

Affiliations: 1: Department of Pathology, Veterans General Hospital-Taipei and National Yang-Ming University, Taiwan, 2: Department of Pathology and 3: Obstetrics and Gynecology, Tokushima Red Cross Hospital, Komatsushima, Japan

Publication date: 2002-11-01

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