The superior mesenteric artery (SMA) is typically visualized surrounded by an echogenic fat pad in the mesentery, producing a characteristic "echogenic ring" appearance on ultrasound. This is a helpful landmark for identifying the SMA in the transverse abdominal aortic plane.

According to Rumack’s Diagnostic Ultrasound:

“The superior mesenteric artery is often seen as a round anechoic structure surrounded by echogenic fat at its origin from the anterior aorta.”