of the IVCS is to deliver the baby. In other conditions, medical or surgical treatment to remove or relieve the offending structure will relieve symptoms. Frequency Epidemiological data is elusive owing to the wide variety of clinical presentation. In the U.S., incidence is estimated to be at 5–10 cases per 100,000 per year. Minor compression of the inferior vena cava during pregnancy is a relatively common occurrence. It is seen most commonly when women lie on their back or right side. 90% of women lying in the supine position during pregnancy experience some form of inferior vena cava syndrome; however, not all of the women display symptoms. References External links Vascular diseases Paraneoplastic syndromes Syndromes affecting the cardiovascular system