A case of carcinomatosis from ovarian endometriosis arising in pelvic lymph nodes

Abstract

Synopsis: 【Background】Endometriosis metastasis to pelvic lymph nodes is often observed, but malignant transformation of the same site alone is rare.

【Case】In this case, we experienced a case of endometrial carcinoma (Grade 3) with squamous differentiation in the lymph nodes in a solitary setting without cancerous lesions in the uterus and adnexa, despite staging surgery for suspected ovarian cancer.

Endometriosis was detected in the bilateral adnexa, and CIN3 lesions were found in the cervix, but none of the lesions were considered lymph node conflicting. The patient had a history of transvaginal alcohol fixation of bilateral ovarian endometriosis lesions. It was thought that an intra-abdominal endometriosis lesion may have become malignant in the lymph nodes, and squamous cell transformation may have occurred.

【Conclusion】As there were no malignant findings in uterine ovaries, and the endometriotic lesions metastasized only to the lymph nodes and became malignant, completely replacing the endometrioid carcinoma, we report this case with a discussion of the literature.