Cystic clear cell tumor of borderline malignancy of the ovary lacking fibromatous components: Report of two cases and a possible new histological subtype

BackgroundAll of the ovarian borderline clear cell tumors ever reported had, without exception, an adenofibromatous pattern.CaseWe report two cases of borderline cystic clear cell tumor of the ovary without apparent invasive lesions or adenofibromatous components.ConclusionThis is the first report of cystic clear cell tumors of borderline malignancy, indicating a possible new histological subtype.