[Ultrasonic diagnosis and follow-up of aneurysms of the ampulla of Galen in infants].

An aneurysm of the vein of Galen can have a varied sonographic appearance in infancy. The classical picture is a spherical posterior third ventricular mass with no internal echoes. With varying degrees of thrombosis of the aneurysm which may occur spontaneously or after surgery, the mass became hyper-echogenic. Our experience in two patients with this spectrum of echographic findings will be demonstrated and correlated with clinical findings CT scan, and angiography.