Foramen ovale aneurysm
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Routine third trimester ultrasound scan. Second trimester anomaly scan was normal.
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Right atrial enlargement.
Foramen flap filling more than fifty percent of the left atrium.
Decreased left ventricular inflow on color Doppler.
Foramen ovale aneurysm also known as atrial septal aneurysm refers to an abnormal protrusion of the interatrial septum resulting in decreased left atrial volume. On color Doppler, there is reduced left ventricular inflow. It is often an isolated finding. In this case, no other fetal anomaly was seen.
- 1. Smith M. Prenatal Finding of Foramen Ovale Aneurysm Causing Mitral Valve Obstruction. Journal of Diagnostic Medical Sonography. 2017;33(6):530-2. doi:10.1177/8756479317729670