The diagnosis of postpartum ovarian vein thrombophlebitis has in the past been based purely on either clinical findings or surgical findings. There is almost no mention of this entity in the diagnostic imaging literature, a reflection of the lack of a means to demonstrate the vein that has existed to this time. We present a case in which the thrombosed vein and the surrounding inflammatory mass were demonstrated preoperatively by computed tomography (CT). We believe that CT may greatly facilitate the diagnosis of this potentially serious disorder.