True about small bowel diveicula-
**Core Concept**
Small bowel diverticula are outpouchings of the intestinal wall, typically occurring at the sites of blood vessel penetration through the muscularis layer. They are most commonly found in the jejunum and can be either true (containing all layers of the intestinal wall) or false (containing only mucosa and submucosa).
**Why the Correct Answer is Right**
The majority of small bowel diverticula are false, containing only mucosa and submucosa. This occurs due to increased intraluminal pressure, which causes herniation of the mucosa and submucosa through the weakened areas in the muscularis layer, specifically at the points of blood vessel penetration. The lack of a muscular layer in false diverticula contributes to their characteristic inability to contract and propel contents.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as small bowel diverticula are not typically associated with a significant increase in the risk of malignancy.
* **Option B:** This option is incorrect as small bowel diverticula are not usually characterized by a high degree of inflammation or infection.
* **Option C:** This option is incorrect as small bowel diverticula are not typically a result of a congenital anomaly.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that small bowel diverticula are often asymptomatic and may be incidentally discovered on imaging studies. Clinical presentation is more commonly related to complications such as obstruction, bleeding, or infection.
**Correct Answer: D.**