Transient physiological myometrial contraction

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

Radiographic features

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

Differential diagnosis

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