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Published online by Cambridge University Press: 25 January 2005
Endometriosis is a benign and often progressive disease in which tissue originating in the uterine lining spreads locally by direct invasion, or through the blood vessels to distal sites. The disorder affects as many as 10–20% of women aged 30–40, although many women remain asymptomatic. Between 30% and 45% of infertile women are diagnosed with endometriosis.