Uterine fibroids

Uterine fibroids, also known as uterine leiomyomas or fibroids, are benign smooth muscle tumors of the uterus. Most women have no symptoms while others may have painful or heavy periods. If large enough, they may push on the bladder causing a frequent need to urinate. They may also cause pain during sex or lower back pain. A woman can have one uterine fibroid or many. Occasionally, fibroids may make it difficult to become pregnant, although this is uncommon.A very large (9 cm) fibroid of the uterus which is causing pelvic congestion syndrome as seen on CTA very large (9 cm) fibroid of the uterus which is causing pelvic congestion syndrome as seen on ultrasoundA relatively large submucosal leiomyoma; it fills out the major part of the endometrial cavityA small uterine fibroid seen within the wall of the myometrium on a cross-sectional ultrasound viewTwo calcified fibroids (in the uterus)A subserosal uterine fibroid with a diameter of 5 centimeters.MRI image with multiple uterine leiomiyomasGiant leiomiyomas almost filling the abdomen. Uterine fibroids, also known as uterine leiomyomas or fibroids, are benign smooth muscle tumors of the uterus. Most women have no symptoms while others may have painful or heavy periods. If large enough, they may push on the bladder causing a frequent need to urinate. They may also cause pain during sex or lower back pain. A woman can have one uterine fibroid or many. Occasionally, fibroids may make it difficult to become pregnant, although this is uncommon. The exact cause of uterine fibroids is unclear. However, fibroids run in families and appear to be partly determined by hormone levels. Risk factors include obesity and eating red meat. Diagnosis can be performed by pelvic examination or medical imaging. Treatment is typically not needed if there are no symptoms. NSAIDs, such as ibuprofen, may help with pain and bleeding while paracetamol (acetaminophen) may help with pain. Iron supplements may be needed in those with heavy periods. Medications of the gonadotropin releasing hormone agonist class may decrease the size of the fibroids but are expensive and associated with side effects. If greater symptoms are present, surgery to remove the fibroid or uterus may help. Uterine artery embolization may also help. Cancerous versions of fibroids are very rare and are known as leiomyosarcomas. They do not appear to develop from benign fibroids. About 20% to 80% of women develop fibroids by the age of 50. In 2013, it was estimated that 171 million women were affected worldwide. They are typically found during the middle and later reproductive years. After menopause, they usually decrease in size. In the United States, uterine fibroids are a common reason for surgical removal of the uterus. Some women with uterine fibroids do not have symptoms. Abdominal pain, anemia and increased bleeding can indicate the presence of fibroids. There may also be pain during intercourse, depending on the location of the fibroid. During pregnancy, they may also be the cause of miscarriage, bleeding, premature labor, or interference with the position of the fetus. A uterine fibroid can cause rectal pressure. The abdomen can grow larger mimicking the appearance of pregnancy. Some large fibroids can extend out through the cervix and vagina. While fibroids are common, they are not a typical cause for infertility, accounting for about 3% of reasons why a woman may not be able to have a child. The majority of women with uterine fibroids will have normal pregnancy outcomes. In cases of intercurrent uterine fibroids in infertility, a fibroid is typically located in a submucosal position and it is thought that this location may interfere with the function of the lining and the ability of the embryo to implant. Some risk factors associated with the development of uterine fibroids are modifiable.Fibroids are more common in obese women. Fibroids are dependent on estrogen and progesterone to grow and therefore relevant only during the reproductive years. Diets high in fruits and vegetables tend to lower the risk of developing fibroids. Fibers, vitamin A, C and E, phytoestrogens, carotenoids, meat, fish, and dairy products are of unclear effect. Normal dietary levels of vitamin D may reduce the risk of developing fibroids. Fifty percent of uterine fibroids demonstrate a genetic abnormality. Often a translocation is found on some chromosomes. Fibroids are partly genetic. If a mother had fibroids, risk in the daughter is about three times higher than average.Black women have a 3-9 times increased chance of developing uterine fibroids than white women. Only a few specific genes or cytogenetic deviations are associated with fibroids. 80-85% of fibroids have a mutation in the mediator complex subunit 12 (MED12) gene.