Prenatal diagnosis of vein of Galen aneurysmatic malformation (VGAM) is made with the use of color Doppler, while in B-mode it is seen as a centrally placed supratentorial cystic structure. 3D-power Doppler (3D-PD) is a method that enables precise visualization of the vascular anatomy of this complex malformation. In our case, VGAM was detected in the 33rd week of gestation with power Doppler, and the use of 3D-PD enabled better visualization of the angioarchitecture and detection of feeding and drainage vessels of aneurysmatic widening. The diagnosis was confirmed postnatally with the use of MRI. A prenatal study of the angioarchitecture could have prognostic significance as well as being important in the therapeutic approach during the postnatal period.