FIG 2.

Classification of Doppler FPs of the SSS in neonates with vein of Galen malformation. A, FP1: Doppler FP with low fluctuation, minimum velocity, never less than half of the maximum velocity. B, FP2: Increased fluctuations of the flow velocities with minimum velocity less than half of the maximum velocity. C, FP3: Doppler FP with intermittent retrograde flow. D, FP4: Doppler FP with pulsatile retrograde flow. E, FP5: Doppler FP with a high retrograde flow (equal or more than one-third retrograde flow of the total Doppler flow). F, FP6: Doppler FP with complete retrograde flow.