Use of hysterosalpingosonography for early diagnosis of ectopic pregnancy

Diagnosis of unruptured ectopic pregnancy was performed using hysterosonography in a patient with no adnexial mass visible on transvaginal sonography and low hCG level (440 UI l(-1)). This avoided a laparoscopy and allowed treatment by single injection of methotrexate. Hysterosonography may be useful for the diagnosis of small ectopic pregnancies.