Because of different patterns of molecular changes, a dualistic model of serous tumors is now assumed with serous borderline tumors (SBT) and low-grade serous carcinomas (LGSC) on one side and high-grade serous carcinomas (HGSC) on the other. The clinical course and the type of treatment of SBT and LGSC depend crucially on whether they are associated with extraovarian manifestations. So-called invasive implants of SBT correspond morphologically to LGSC. The MD Anderson grading system has become established for the distinction between LGSC and HGSC, HGSC shows a wide range of growth patterns, including a transitional epithelial-like type. Carcinosarcomas can be interpreted as HGSC variants. Considering the new theory that all serous neoplasms of the ovary, peritoneum and fallopian tubes are derived from the tubal fimbria, the term "ovarian carcinoma" seems no longer appropriate.
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