terine arteriovenous malformations (AVMs) are usually diagnosed in women with unexplained vaginal bleeding and are frequently life threatening. 1,2 When AVMs are diagnosed during pregnancy, there is concern that they could grow or bleed.3-6 To our best knowledge, there has been no reported case of an initial diagnosis of an asymptomatic AVM in a pregnant woman with a normal outcome. This case illustrates our experience with conservative management of a uterine AVM.Received February 26, 2004, from the Departments of Radiology (I.C.-A., D.L.) and Obstetrics and Gynecology (J.A.)
Case ReportA 29-year-old woman, gravida 1, para 0, with a history of myomectomy 3 years earlier for a large left subserosal fibroid underwent routine first-trimester sonography in Costa Rica. Within the left posterior myometrial wall was a region of cystic spaces measuring 3 × 5 cm in greatest diameter that on color Doppler imaging was filled with turbulent flow with high systolic and diastolic velocities (Figure 1). With a peak systolic velocity (PSV) of 99 cm/s, resistive index (RI) of 0.49, and pulsatility index (PI) of 0.65, the diagnosis of a myometrial AVM was made. The patient was referred to our institution for a second opinion and counseling. An additional sonogram again showed findings of a uterine AVM. Of importance, a small portion of the placental edge was located near the vascular abnormality, but there was myometrium between the blood vessels and most of the placenta (Figure 2). The patient was counseled regarding risks of bleeding for the mother and the fetus during both the pregnancy and delivery. The patient recognized these risks but wanted to continue the pregnancy. A cesarean delivery was planned at term. Further discussions included the potential need for a uterine artery catheterization procedure to expedite embolization if necessary at the time of delivery and potential for a hysterectomy. The patient lived in a rural area of Costa Rica, and she temporarily moved near a tertiary care center for more rapid access to health care if needed.