16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the prevalence and/or incidence of Ovarian cysts.
Exactly what causes ovarian cancer isn't known, but the greatest number of cases occurs in the fifth decade of life. However, it can occur during childhood. Other contributing factors include infertility; nulliparity; familial tendency; ovarian dysfunction; irregular menses; and possible exposure to asbestos, talc, and industrial pollutants.
Primary epithelial tumors arise in the ovarian surface epithelium; germ cell tumors, in the ovum itself; and sex cord tumors, in the ovarian stroma. Ovarian tumors spread rapidly intraperitoneally by local extension or surface seeding and, occasionally, through the lymphatics and the bloodstream. Generally, extraperitoneal spread is through the diaphragm into the chest cavity, which may cause pleural effusions. Other metastasis is rare.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Ovarian cysts usually refers to the estimated population of people who are managing Ovarian cysts at any given time. The term 'incidence' of Ovarian cysts refers to the annual diagnosis rate, or the number of new cases of Ovarian cysts diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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