[Vaginal ultrasound in ovarian pregnancy].

A 34-year-old woman had a serum hCG level of 4596 mIU/mL on cycle day 48 and an empty uterus with an IUD in situ. Transvaginal sonography showed a 20 mm ring-like thick-walled hyperechogenic structure within the right ovary. The echogenic ring was surrounded by irregular, hypoechogenic structures suggestive of an ovarian pregnancy with periluteal haemorrhage and blood clots. The ruptured cystic ovarian pregnancy and the corpus luteum were removed by laparoscopy. Histopathology showed isolated chorionic villi within haemorrhagic areas in the vicinity of the corpus luteum. Transvaginal sonography is of diagnostic value in differentiating an ovarian pregnancy from a tubal ectopic pregnancy.