Fig. 2
Control group. Nulliparous female patient 23 years old. 2D ultrasound shows: (a): normal rectum, vagina, and anal canal. Anorectal angle (100°). No detected rectocele or intussusception. 3D ultrasound shows: At rest (b): levator area: transverse diameter 3 cm. AP diameter 5 cm. Hiatal area: 11.5 cm2. Thickness of internal sphincter 1.7 mm (arrow). Thickness of external sphincter 2.4 mm (arrow head). Thickness of PRS about 3.7 mm (double arrows). During squeezing (c): levator area: transverse diameter 3.3 cm. AP diameter 4.3 cm. Hiatal area: 10.7 cm2. Thickness of internal sphincter 1.7 mm (arrow). Thickness of external sphincter 2.8 mm (arrow head). Thickness of PRS about 2.6 mm (double arrows). During straining (d): levator area: transverse diameter 3.4 cm. AP diameter 4.2 cm. Hiatal area: 14.8 cm2. Thickness of internal sphincter 2 mm (Arrow). Thickness of external sphincter 1.9 mm (arrow head). The thickness of PRS about 4 mm (double arrows)