A leiomyoma (plural is 'leiomyomata') is a benign smooth muscle neoplasm that is not premalignant . They can occur in any organ, but the most common forms occur in the uterus and the esophagus.

Uterine leiomyomata

See uterine fibroids

Esophageal

They are also the most common benign esophageal tumour, though this accounts for less than 1% of esophageal neoplasms.

References

• Merck Manual: Uterine fibroids
• Esophageal Leiomyoma
• Atlas of Pathology uterine leimyoma