There are four different types of fibroids, which are named depending on their location.
Outside the womb: Subserous fibroids develop from the womb’s outside wall and grow into the space in the pelvis
On the muscle wall of the womb: Intramural fibroids grow in the womb’s muscle wall
The inner wall of the womb growing into the space inside the womb: Submucous fibroids grow from the womb’s inner wall into the space inside the womb
Stalk type fibroids: Both subserous and submucous fibroids can develop on a stalk. When this occurs they are called pedunculated fibroids.