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Three-dimensional introital ultrasound image showing urethral rotational descent from resting (a) to straining (b) in sagittal (panel 1), frontal (panel 2), axial (panel 3), and rendered (panel 4) views. A: Anus, BL: Bladder, R: Rectum, SP: Symphysis pubis, U: Urethra, V: Vagina
