Uterine fibroids are benign tumors of the muscle of the uterus. You might also hear them referred by several other names, including leiomyoma, leiomyomata, myoma and fibromyoma. Fibroid tumors of the uterus are very common – it is believed that 20-40% of women have uterine fibroids, but for most women, they either do not cause symptoms or cause only minor symptoms. MRI is the preferred imaging modality for characterizing uterine fibroids and identifying their precise location and measurement for accurate mapping and treatment. MRI has a sensitivity of 86-92%, a specificity of 100%, and an accuracy of 97% in the evaluation of probable fibroids.