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Uterine fibroids and hysterectomy - Introduction

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of uterine fibroids

Alternative Names

Hysterectomy and uterine fibroids; Leiomyoma; Myoma

Introduction:

A uterine fibroid (known medically as a leiomyoma or myoma) is a noncancerous (benign) growth of smooth muscle and connective tissue. Fibroids can range in size from as small as a pinhead to larger than a melon. Fibroids have been reported weighing more than 20 pounds.

Fibroids originate from the thick wall of the uterus and are categorized by where they grow:

Intramural fibroids grow within the middle and thickest layer of the uterus (called the myometrium).
Subserosal fibroids grow out from the thin outer fibrous layer of the uterus (called the serosa). Subserosal can be either stalk-like (pedunculated) or broad-based (sessile).
Submucosal fibroids grow from the uterine wall toward and into the inner lining of the uterus (the endometrium). Submucosal fibroids can also be stalk-like or broad-based.

Fibroid tumors may not need to be removed if they are not causing pain, bleeding excessively, or growing rapidly.

The Female Reproductive System

The primary structures in the reproductive system are as follows:

The uterus is a pear-shaped organ located between the bladder and lower intestine. It consists of two parts, the body and the cervix.
When a woman is not pregnant the body of the uterus is about the size of a fist, with its walls collapsed and flattened against each other. During pregnancy the walls of the uterus are pushed apart as the fetus grows.
The cervix is the lower portion of the uterus. It has a canal opening into the vagina with an opening called the os, which allows menstrual blood to flow out of the uterus into the vagina.
Leading off each side of the body of the uterus are two tubes known as the fallopian tubes. Near the end of each tube is an ovary.
Ovaries are egg-producing organs that hold 200,000 - 400,000 follicles (from folliculus, meaning "sack" in Latin). These cellular sacks contain the materials needed to produce ripened eggs, or ova.

The inner lining of the uterus is called the endometrium. During pregnancy this inner lining thickens and becomes enriched with blood vessels to house and support the growing fetus. If pregnancy does not occur, the endometrium is shed as part of the menstrual flow. Menstrual flow also consists of blood and mucus from the cervix and vagina.

Reproductive Hormones. The hypothalamus (an area in the brain) and the pituitary gland regulate the reproductive hormones. The pituitary gland is often referred to as the master gland because of its important role in many vital functions, many of which require hormones.

In women, six key hormones serve as chemical messengers that regulate the reproductive system:

The hypothalamus first releases the gonadotropin-releasing hormone (GnRH).
This chemical, in turn, stimulates the pituitary gland to produce follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
Estrogen, progesterone, and the male hormone testosterone are secreted by the ovaries at the command of FSH and LH and complete the hormonal group necessary for reproductive health.

It is not clear what causes fibroids, but estrogen and progesterone appear to play a role in their growth. Fibroids tend to shrink after menopause, when estrogen levels decline.

Uterus
Click the icon to see an image of the uterus.

The pituitary gland
Click the icon to see an image of the pituitary gland.

Hypothalamus
Click the icon to see an image of the hypothalamus.

Resources

www.asrm.com -- American Society for Reproductive Medicine
www.acog.org -- American College of Obstetricians and Gynecologists
www.sirweb.org -- Society of Interventional Radiology
www.nuff.org -- National Uterine Fibroids Foundation
www.rsna.org -- Radiological Society of North America
www.radiologyinfo.org -- Radiology info from the American College of Radiology and the Radiological Society of North America
www.womenshealth.gov -- National Women's Health Information Center
www.nichd.nih.gov -- National Institute of Child Health and Human Development

References

American College of Obstetricians and Gynecologists. ACOG practice bulletin. Alternatives to hysterectomy in the management of leiomyomas. Obstet Gynecol. 2008 Aug;112(2 Pt 1):387-400.

Edwards RD, Moss JG, Lumsden MA, Wu O, Murray LS, Twaddle S, et al. Uterine-artery embolization versus surgery for symptomatic uterine fibroids. N Engl J Med. 2007 Jan 25;356(4):360-70.

Evans P, Brunsell S. Uterine fibroid tumors: diagnosis and treatment. Am Fam Physician. 2007 May 15;75(10):1503-8.

Gabriel-Cox K, Jacobson GF, Armstrong MA, Hung YY, Learman LA. Predictors of hysterectomy after uterine artery embolization for leiomyoma. Am J Obstet Gynecol. 2007 Jun;196(6):588.e1-6.

Griffiths A, D'Angelo A, Amso N. Surgical treatment of fibroids for subfertility. Cochrane Database Syst Rev. 2006 Jul 19;3:CD003857.

Hehenkamp WJ, Volkers NA, Donderwinkel PF, de Blok S, Birnie E, Ankum WM, et al. Uterine artery embolization versus hysterectomy in the treatment of symptomatic uterine fibroids (EMMY trial): peri- and postprocedural results from a randomized controlled trial. Am J Obstet Gynecol. 2005 Nov;193(5):1618-29.

Jacoby VL, Grady D, Sawaya GF. Oophorectomy as a risk factor for coronary heart disease. Am J Obstet Gynecol. 2009 Feb;200(2):140.e1-9. Epub 2008 Nov 18.

Kaunitz AM. Progestin-releasing intrauterine systems and leiomyoma. Contraception. 2007 Jun;75(6 Suppl):S130-3. Epub 2007 Mar 9.

Kaunitz AM, Meredith S, Inki P, Kubba A, Sanchez-Ramos L. Levonorgestrel-releasing intrauterine system and endometrial ablation in heavy menstrual bleeding: a systematic review and meta-analysis. Obstet Gynecol. 2009 May;113(5):1104-16.

Lethaby A, Ivanova V, Johnson NP. Total versus subtotal hysterectomy for benign gynaecological conditions. Cochrane Database Syst Rev. 2006 Apr 19;(2):CD004993.

Olive DL, Lindheim SR, Pritts EA. Conservative surgical management of uterine myomas. Obstet Gynecol Clin North Am. 2006 Mar;33(1):115-24.

Parker WH, Broder MS, Chang E, Feskanich D, Farquhar C, Liu Z, et al. Ovarian conservation at the time of hysterectomy and long-term health outcomes in the nurses' health study. Obstet Gynecol. 2009 May;113(5):1027-37.

Rackow BW, Arici A. Options for medical treatment of myomas. Obstet Gynecol Clin North Am. 2006 Mar;33(1):97-113.

Smart OC, Hindley JT, Regan L, Gedroyc WG. Gonadotrophin-releasing hormone and magnetic-resonance-guided ultrasound surgery for uterine leiomyomata. Obstet Gynecol. 2006 Jul;108(1):49-54.

Van Voorhis B. A 41-year-old woman with menorrhagia, anemia, and fibroids: review of treatment of uterine fibroids. JAMA. 2009 Jan 7;301(1):82-93. Epub 2008 Dec 2.

Viswanathan M, Hartmann K, McKoy N, Stuart G, Rankins N, Thieda P, et al. Management of uterine fibroids: an update of the evidence. Evid Rep Technol Assess (Full Rep). 2007 Jul;(154):1-122.

Volkers NA, Hehenkamp WJ, Birnie E, Ankum WM, Reekers JA. Uterine artery embolization versus hysterectomy in the treatment of symptomatic uterine fibroids: 2 years' outcome from the randomized EMMY trial. Am J Obstet Gynecol. 2007 Jun;196(6):519.e1-11.

Reviewed last on: 8/5/2009
Reviewed by Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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