A myoma is a type of tumor that involves muscle cells. There are two main types of myoma:
- Leiomyomas which occur in smooth muscle. They are rare tumors. So-called adult rhabdomyoma has been diagnosed mostly in men aged >40 years, whereas fetal rhabdomyoma occurs between birth and early childhood (<3 years). They very rarely become malignant.
Whether or not angiomyomas are a type of leiomyoma or a separate entity is disputed as of 2014.