User:Mr. Ibrahem/Chorionic hematoma

Chorionic hematoma is the pooling of blood between the chorion, a membrane surrounding the embryo, and the uterine wall. Symptoms may vary from none to vaginal bleeding. There is generally no pain, though some may have cramps. Large areas of bleeding are associated with pregnancy loss. Other complications may include preterm delivery and preterm rupture of membranes.

The cause is unclear. Risk factors include previous miscarriage, uterine malformation, and pelvic infections. The underlying mechanism is believed to involved detachment of the chorion from the uterus. Diagnosis is by ultrasound.

Treatment depends on the severity of symptoms. In those who are RhD negative it should include anti-D immune globulin. The risk of miscarriage, when a heart beat is present, is about 10%.

Chorionic hematoma occurs in about 1 to 18% of pregnancies. They most commonly present between 10 and 20 weeks of gestational age. They were first described in 1981.