Endometriosis is defined as the presence of tissueA group of cells with a similar structure and a specialised function. or cells from the lining of the wombThe uterus. (endometriumThe layer of tissue lining the uterus.) elsewhere in the body. It is most commonly found around the uterusThe womb, where embryo implantation occurs and the growing foetus is nourished. and ovariesFemale reproductive organs situated one on either side of the uterus (womb). They produce egg cells (ova) and hormones in a monthly cycle., but it can be located anywhere in the body except the spleenAn organ situated on the left side of the abdomen that filters out worn-out red blood cells and other foreign bodies from the bloodstream.. In the ovary endometriosisA condition in which tissue that normally lines the uterus (womb) of a woman is found outside the uterus or in other parts of the body. can form cysts containing old bloodA fluid that transports oxygen and other substances through the body, made up of blood cells suspended in a liquid., also known as chocolate cysts (endometriomaA cyst that is formed when endometrial tissue, the membrane that makes up the inner layer of the uterine wall, grows in the ovaries. ) due to the colour of the contents. When it is in the pelvisThe bony basin formed by the hip bones and the lower vertebrae of the spine; also refers to the lower part of the abdomen. it may affect the bowelA common name for the large and/or small intestines. and the urinary tractThe channels that carry urine from the kidneys to the outside of the body. (bladderThe organ that stores urine. and kidneys). Occasionally it is found in the navel or operation scars. When the tissue from the lining of uterus is found in the muscleTissue made up of cells that can contract to bring about movement. layer of the uterus it is called adenomyosis. Sometimes endometriosis and adenomyosis can be found together in the same woman.
