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The four different labels of fetal orientation. (A) Vertex (head down). (B) Breech (head up). The blue arrow is pointing to the maternal intestines. The red arrow is pointing to the maternal bladder. These two maternal organs were used as reference while manually labeling each two-dimensional (2D) slice based on the fetal orientation. (C) Transverse (sideways). (D) Oblique (diagonal).
