**Core Concept**
Meckel diverticulum is a congenital anomaly of the small intestine resulting from the incomplete closure of the vitelline duct, a communication between the embryonic midgut and the yolk sac.

**Why the Correct Answer is Right**
Meckel diverticulum typically presents as a 2-5 cm, pear-shaped pouch on the antimesenteric border of the ileum, usually within 60 cm of the ileocecal valve. The diverticulum contains a varying amount of mucosa, often with ectopic gastric or pancreatic tissue, which can cause symptoms due to acid secretion or enzyme production. The presence of ectopic gastric tissue is the most common cause of complications, such as gastrointestinal bleeding.

**Why Each Wrong Option is Incorrect**
**Option A:** Meckel diverticulum is a common cause of intussusception in children. This is incorrect because intussusception is more commonly associated with Meckel's diverticulum in adults.
**Option B:** Meckel diverticulum typically presents with appendicitis-like symptoms. This is incorrect because while Meckel diverticulum can present with abdominal pain, it typically does not mimic appendicitis.
**Option C:** Meckel diverticulum is a common cause of small bowel obstruction. This is incorrect because while Meckel diverticulum can cause intussusception, which may lead to obstruction, it is not a common cause of small bowel obstruction.

**Clinical Pearl / High-Yield Fact**
The location of the Meckel diverticulum, typically within 60 cm of the ileocecal valve, is a key clinical correlation to remember.

**Correct Answer:** D.