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Uterine inversion is a rare condition in which the uterus is essentially turned inside out. There are two types: "puerperal" (within six weeks of childbirth) and "non-puerperal". The reason for uterine inversion is unclear. In the puerperal form, it is theorized that excessive traction on the umbilical cord during delivery may cause it.
Puerperal uterine inversion is estimated to occur in 1/30,000 deliveries. Non-puerperal is even rarer and has been estimated at 5-15% of the rate of puerperal inversion.
Described presentations include vaginal bleeding and vaginal mass.
Exaggerated umbilical cord traction, with a placental fundal fixation that will lead to excessive fundal pressure in the situation of a loose uterus, are the two considerably popular, suggested causes for uterine inversion 4.
Uterine inversion can be a difficult diagnosis on ultrasound and often is confirmed with CT or MRI. If there is a vaginal mass, the cervix cannot be distinguished, and the uterine fundus cannot be seen, then it suggests the diagnosis.
- On longitudinal scan: uterine fundus is upside down (fallen fundus sign)
- On transverse scan: a bull's eye or target-like appearance may be seen
CT and MRI
A spectrum of uterine inversion has been described with the mildest form as a fundal inversion that does not extend through the cervix and the most extreme form as a uterus and cervix that have completely inverted.
Treatment and prognosis
Given the rarity of the condition, treatment is not standardized, but most sources describe reverting the uterus immediately if there is vaginal bleeding. Failure to revert the uterus in the acute postpartum setting could lead to fatal blood loss and a mortality rate of 15% has been quoted 3.