Fig. 2. Mesorectal fat bare area between distal end of mesorectum (black line) and level of anorectal junction (red line).

A. Schematic drawing depicting mesorectal fat bare area. Length of bi-directional arrow is approximately 1 cm. B. Cadaveric dissection image shows that mesorectal fat is absent along longitudinal extent corresponding to same bi-directional arrow. At this site, only rectal wall is present. (Adapted from Kim. Yonsei Med J 2005;46:737–749) (73). C. On T2-weighted oblique coronal image, imaginary black line is drawn at 1 cm (bi-directional arrow) above anorectal junction level (red line) which roughly corresponds to upper end of intersphincteric plane.