The following images and videos show a case of prenatal "restriction" of the foramen ovale and its aneurysm. The patient was scanned at 37+0 weeks of gestation. Interestingly an intermittent reversed flow was seen at the level of foramen ovale having left-to-right direction. As no other signs of premature closure of the foramen ovale were seen, we presumed the phenomenon was caused by narrowing of the foramen ovale. The newborn was delivered one week later and is doing well.

We have discussed the case with Moshe Bronshtein (Haifa, Israel) and he presumed the "reversed" flow at the level of the foramen ovale (blue flow on the image 2) may actually be just projection of an unroofed coronary sinus. Postnatally the anomaly was not found. Another explanation could be the swirling of blood in the space under the foramen ovale flap