Transient physiological myometrial contraction

Transient myometrial contraction is a physiological phenomenon which may mimic focal adenomyosis

It appears as focal low signal intensity bulge/region of the myometrium which may disappear on subsequent images or at cine MR imaging.

focal adenomyosis
- persists on subsequent MRI images or cine MRI imaging
- Susceptibility-weighted imaging can show small hemorrhagic signal void foci
uterine leiomyoma