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Fibroids can grow in different parts of the uterus:
Under the outer surface of the uterus (subserosal fibroids)
In the wall of the uterus (intramural fibroid)
Under the lining of the uterus (submucosal fibroid)
Some fibroids grow on a stalk and can protrude into the abdomen or the uterine cavity. They are called pedunculated fibroids.