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The uterus, or womb, is part of the female reproductive system. Often described as pear-shaped, it is located in the lower abdomen. The uterus lies in close proximity to the ovaries, where unfertilized eggs are stored. During ovulation the eggs travel down the fallopian tubes to the uterus. Fertilized eggs implant and grow in the uterus.

Uterine fibroid tumors are the most common type of neoplasm in the female reproductive system (neoplasm is simply another word for tumor). This particular type of neoplasm develops from the smooth muscle tissues of the womb. They are extremely common in women: 20 to 25 percent of women develop uterine fibroid tumors. Most fibroids never cause symptoms and do not require removal. Other names for fibroids are leiomyomas, leiomyomata, fibromyomas, and myomas.

Is a Fibroid Cancerous?

Uterine fibroid tumors are benign growths, and are only very rarely malignant. Less than one percent develop into uterine cancer. These very rare occurrences generally occur in women during menopause. The vast majority of leiomyomas are not life threatening, although some can cause health complications.

Types of Uterine Fibroid Tumors

A uterine fibroid develops from a single cell in the uterus muscle. The neoplasm may be less than a quarter of an inch long; many measure up to six inches; and a rare few grow as large as ten inches in diameter.