Anus
Category:
Bowel
Description:
Anus
Model: TSGyneOrgans
CT
Model Information
Metrics
Delineation Information
Guidelines
PROPARA Trial Guidelines
Method
Delineated as a solid structure encompassing the entire al cal as a sold structure. Usual length = 2.5 - 3 cm.
Structure Boundaries
Cranial Boundary
At the level where the rectum ends. Typically delineated at the level where the rectum has a rrowing followed by a backward bend. At this level the rectal ampulla is rrowed by the puborectalis sling (the levator ani) muscle.
Caudal Boundary
Where the al verge is located. Typically visible as the end of the mucosal lining around the al verge.
Medial Boundary
Outer wall of the al cal
Lateral Boundary
Outer wall of the al cal
Ventral Boundary
Outer wall of the al cal
Dorsal Boundary
Outer wall of the al cal