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Fig. 1A —Position of right adrenal vein orifice, its relationship to surrounding structures, and direction of right adrenal vein. Transverse plane seen inferiorly shows position of right adrenal vein orifice, which was estimated along circumference of inferior vena cava (IVC) as an angle——between radius through orifice and x-axis in xy plane. Intersection of x- and y-axes is specified as center of IVC. Angle was measured positively in clockwise direction from x-axis, with a negative angle being in counterclockwise direction. When falls between 0° and 90°, right adrenal vein is described as entering IVC in right posterior quadrant; when falls between –90° and 0°, right adrenal vein is described as entering in left posterior quadrant.