MRI features of a large uterine leiomyoma (Figo 4) with cystic degeneration.

Intramural uterine leiomyoma is the considered the most common type of uterine leiomyoma in terms of location. 

Cystic degeneration of uterine leiomyomas is an uncommon type of degeneration and represents ~4% of all types of uterine leiomyoma degeneration.