Circle of Willis Tonny Gabrielle, MD Article Published: Apr 5, 2004 AUSL Reggio Emilia & Centro Medico " S. Camillo" Parma , Sessione Diagnosi Prenatale.Italy This is a power Doppler rendering of the circle of Willis in a 26-week fetus. Figures 1-2: Discussion Board Start a discussion about this article Add bookmark Bookmarked