Abnormal fetal cardiovascular morphology Abnormal fetal heart outflow tract 2023-01-19T07:38:07Z The left ventricular outflow tract is the anatomic structure through which the left ventricular stroke volume passes towards the aorta. The right ventricular outflow tract is the structure through which the right ventricular stroke volume passes to the pulmonary artery. A prenatal anomaly of the outflow tract. Fetal ultrasound may not always be able to easily and accurately describe the outflow anomaly, but can detect abnormal anatomy. Often, follow up with a fetal echo is recommended, but fetal ultrasound is limited.