A case of spontaneous uterine artery pseudoaneurysm in a primigravid woman at 16 weeks gestation.

We report a case of a uterine artery pseudoaneurysm in a 29-year-old primigravid woman at 16 weeks gestation. The woman presented to the emergency room with lower left quadrant pain and vaginal bleeding. Ultrasound revealed a left adnexal mass consistent with a pseudoaneurysm. Percutaneous thrombin injection was chosen to avoid contrast and radiation risks to the fetus. Ultrasound demonstrated thrombosis of the pseudoaneurysm with no evidence of fetal distress. On postprocedure day 2, the patient presented again with similar complaints of lower quadrant pain and vaginal bleeding. The pseudoaneurysm was found to have recanalized and a decision was made to treat with computed tomography angiography and coil embolization. The procedure was successful, with angiography revealing an incidental branch of the pseudoaneurysm that was subsequently embolized.