Which of the following is removed in extended right colectomy?
**Core Concept**
An extended right colectomy is a surgical procedure that involves the removal of a portion of the large intestine, specifically the ascending colon and possibly the transverse colon. This procedure is typically performed to treat conditions such as colon cancer, Crohn's disease, or ulcerative colitis that affect the right side of the colon.
**Why the Correct Answer is Right**
The correct answer is the terminal ileum, which is the last portion of the small intestine that connects to the large intestine. During an extended right colectomy, the terminal ileum is removed along with the ascending colon and possibly the transverse colon. This is because the terminal ileum is often involved in the disease process and removing it helps to ensure that all affected tissue is eliminated. The ileocecal valve, which is located at the junction between the terminal ileum and the large intestine, is also typically removed during this procedure.
**Why Each Wrong Option is Incorrect**
* **Option A:** The cecum is the first portion of the large intestine and is not removed during an extended right colectomy.
* **Option B:** The appendix is a small pouch-like structure attached to the large intestine and is not typically removed during an extended right colectomy, although it may be incidentally removed.
* **Option D:** The descending colon is a portion of the large intestine that is located on the left side of the abdomen and is not removed during an extended right colectomy.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that an extended right colectomy involves the removal of the terminal ileum, which can lead to complications such as short bowel syndrome or malabsorption if not managed properly. Surgeons and medical teams must carefully evaluate patients for these risks and take steps to mitigate them.
**Correct Answer:** C. The terminal ileum.