Fig. 1

Coronal T2-weighted image of the pelvic floor obtained by surface coil (a), and schematic representation (b). Coronal T2-weighted image obtain by endoanal coil (c) and its schematic representation (d). Axial T2-weigted image at the level of sphincters (e) and the corresponding schematic image (f). Axial T2-weighted image at the level higher than the dentate line (g) and corresponding schematic image (h). On all schematic images the black lines represent levator ani muscle; the blue dotted line represents muscular propria and internal sphincter; the red areas represent external sphincter; and the green areas represent the external sphincter