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Ovarian tumor

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In 2020, the World Health Organization (WHO) divided ovarian tumours as 90% epithelial, 3% germ cell, and 2% sex cord-stromal types.

Histopathologic classification

Tumor of the ovary vary remarkably as they may arise from any of the 3 cell types of the normal ovary.

Ovarian tumors are classified according to the histology of the tumor, obtained in a pathology report. Histology dictates many aspects of clinical treatment, management, and prognosis.

The most common forms are:

Mixed tumors contain elements of more than one of the above classes of tumor histology.

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