Which option best summarizes pouch configurations that can be created in IPAA (besides J-pouch)?

• A. S-pouch and W-pouch
• B. K-pouch and N-pouch
• C. P-pouch and Q-pouch
• D. O-pouch and R-pouch

Answer: (A)

The main concept is that after an IPAA, surgeons can shape the ileal reservoir in different ways beyond the standard J-pouch to fit pelvic anatomy and potentially alter capacity and function. The best answer identifies the S-pouch and W-pouch as recognized alternative configurations for the IPAA. An S-pouch uses a serpentine, longer arrangement of ileal limbs to create a more extended reservoir, while a W-pouch folds the ileum into a four-limb, W-shaped reservoir to maximize volume. These variations are purposefully developed within IPAA to achieve adequate storage and continence when the anatomy or mesentery limits a traditional J-pouch.

The other options describe pouches that are not part of IPAA configurations. For example, a K-pouch is a continent ileostomy with a reservoir and a catheterizable channel, not an ileal pouch connected to the anal canal. The remaining letter-style pouches (N-, P-, Q-, O-, R-pouch) are not standard or widely recognized IPAA designs.