Prominent congestion in the labyrinthine region of placenta in association with chronic gestational ethanol exposure. Full-thickness images of placentas from control (A, B) and ethanol-exposed (C, D) dams (H&E stained sections, original magnification X4 [A, C] and X400 [B, D]). The arrows delineate the borders of the junctional zone. The boxed areas in A and C are the labyrinthine regions depicted in high magnification images (B, D). The decidua is marked with (*) in low magnification images.