Myometrial cysts are cysts seen in the myometrium and these can be differentiated appropriately based on location and sonological or Doppler features.
They can arise from variable etiology and include.
- adenomyosis: the cysts are most often seen in the endomyometrial junction region. They ideally are small <5 mm, however may be large;. as it is a basic ectopic functioning endometrial gland, the cysts may be thick walled, have internal debris, or fluid fluid levels.
- arcuate veins: not really cysts but these cystic structures are classically seen in the outer third of the uterus and on Doppler would demonstrate a flow
- nabothian cysts in cervix; these are relatively common and are classically seen in the region of cervix.
- post-Cesarean cyst: seen in the lower uterine segment in the anterior aspect, near the cesarean scar; it most often will be associated with the wedge shaped defect in the endometrium.
- cystic degeneration of a leiomyoma
Other rare cyst like lesions include