Diagnosis of an Angular Pregnancy in the First Trimester Using Three-dimensional Ultrasound

Abstract

Objective: Angular pregnancy is a rare type of intrauterine pregnancy. However, its differentiation from an interstitial pregnancy is often confusing in spite of use of high-resolution transvaginal sonography. This report discusses a case of angular pregnancy, which was confirmed using 3D ultrasound at 7 weeks and 2 days of gestation. Case Report(s): A 31-year-old woman, gravida 3, para 2, was referred to our hospital with a suspected interstitial pregnancy at 7 weeks of gestation. We could not determine whether the gestational sac was located within or outside the uterine cavity by 2D sonography. A gestational sac lying at the left uterine angle and partially protruding into the interstitial part of the tube was clearly demonstrated by 3D transvaginal sonography. Suctional dilatation and curettage (D&C) was chosen by the patient. Conclusion(s): Three-dimensional ultrasound is a helpful diagnostic tool in women with suspected angular or interstitial pregnancies. The use of 3D ultrasound permits an early non-invasive diagnosis of an angular pregnancy, and allows appropriate management which can avoid an invasive procedure.