By Rachel Gurevich, About.com
Updated March 27, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Special kind of cyst that appears on the ovary, filled with old blood. They are also known as “chocolate cysts” because the fluid inside resembles melted chocolate. These cysts may cause pelvic pain, block the egg and sperm from meeting, or interfere with ovulation. They are caused by endometriosis.
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