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Malignant transformation of ovarian endometriosis
M Nishida1, K Watanabe, N Sato
1Department of Obstetrics and Gynecology, Institute of Clinical Medicine, University of Tsukuba, Japan. mnishida@md.tsukuba.ac.jp
Gynecologic and Obstetric Investigation
|November 28, 2000
Abstract:
One hundred forty-seven cases of ovarian endometriosis, encountered from 1976 to 1999 at Tsukuba University Hospital, were studied to clarify the incidence of malignant transformation. There were 18 cases (12.2%) of atypical endometriosis, among which we found a case (5.6%) of ovarian cancer arising from endometriosis not diagnosed before surgery. This is accounted for 0.7% of all ovarian endometriosis cases. Because the incidence was equal to that of the previous reports, it is most likely that the malignant change in ovarian endometriosis occurred in 0.7% of this disease.