Fibroids - NHS

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Types of fibroids

Fibroids can grow anywhere in the womb and vary in size considerably. Some can be the size of a pea, whereas others can be the size of a melon.

The main types of fibroids are:

intramural fibroids – the most common type of fibroid, which develop in the muscle wall of the womb
subserosal fibroids – fibroids that develop outside the wall of the womb into the pelvis and can become very large
submucosal fibroids – fibroids that develop in the muscle layer beneath the womb's inner lining and grow into the cavity of the womb

In some cases, subserosal or submucosal fibroids are attached to the womb with a narrow stalk of tissue. These are known as pedunculated fibroids.