In medical terminology, an antrum is a nearly closed chamber or cavity within the body. In sonography, this term is most frequently used in two contexts. The gastric antrum is the lower portion of the stomach near its connection to the duodenum, and evaluating it with ultrasound is particularly important in pediatric imaging for diagnosing pyloric stenosis. The antral follicle in the ovary is a developing follicle that has formed a fluid-filled cavity visible on ultrasound, and counting these antral follicles is used to assess a woman’s ovarian reserve, or how many eggs she likely has remaining, which is important in fertility evaluation.
Sonography Term