Derived from primitive germ cells of embryonic gonad.Do not fit into any of the above categories. Around half are associated with endometriosis. Around 5% of these are linked to endometriosis. Account for around 20% of epithelial tumours. Most occur in women between 40-60 years of age. The most common subtype, accounting for more than half of epithelial tumours. There are a number of subtypes of epithelial tumours.Occur most commonly in women aged over 50 years.Arise from the epithelial surface of the ovary.The most common type, accounting for around 90% of all ovarian cancers.Classification varies across the literature but can be broadly broken down as follows. The age group affected, management and prognosis vary widely between them. There are many different types of ovarian cancer. Malignant ovarian tumours may be solid or cystic. The vast majority of ovarian cancers are classified as epithelial, as they arise from the epithelial surface of the ovary. Early symptoms may be subtle and presentation is often late. It is the leading cause of death from gynaecological cancer in the UK. Ovarian cancer is a malignancy arising from the ovary.
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