You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which is the commonest malignancy of ovary? and explain in detail?
Serous cystadenoma and cystadenocarcinoma are amongst the most common of cystic ovarian neoplasm, accounting about 50% of all ovarian tumors, of these 60% are benign, 15% borderline and 25% are malignant. Of the all cystic tumors of the ovary 5 to 10% are dermoids. Dermoid cyst is usually unilocular, with smooth surface seldom attaining more than 15 cm in diameter. Granulosa cell tumours are fairly common and represents 10% of all solid ovarian tumours. Ref: Shaw's Textbook of Gynaecology, 13th Ed, Page 358-359.