Type I ovarian tumors (low-grade serous carcinoma, mucinous carcinoma, endome-trioid carcinoma, malignant Brenner tumor, and clear cell carcinoma) develop in a stepwise manner from well-accepted precursors, namely, borderline tumors that in turn develop from cystadenomas/adenofibromas4 (see Table 2-1 and Fig. 2-1). Serous and mucinous tumors appear to develop from the surface inclusion cysts or cystade-nomas, whereas endometrioid and clear cell tumors develop from endometriosis or endometriomas. Type I tumors are slow-growing, large, and often confined to the ovary at the time of diagnosis.
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