This volume provides an in-depth analysis of abnormal pelvic anatomy in various forms of anorectal anomalies, often with multiple associations.  The anatomy of the pelvis is one of the most complex in the body, and anatomists have provided detailed descriptions of normal anatomy based on cadaver dissections. However, congenital abnormalities present a spectrum of deviations from normal, which can be difficult to perceive with surgical practice alone. The advent of cross-sectional imaging has fortunately provided a powerful tool, allowing clinicians to study these anomalies in depth and on multiple planes.