**Core Concept**
Intussusception is a condition where one segment of the intestine telescopes into another, causing obstruction. The most common types are ileocolic and ileoileal, while multiple intussusception—where more than one intussusception occurs—is rare and often associated with underlying pathology.
**Why the Correct Answer is Right**
Multiple intussusception is the least common type because it typically arises from complex or systemic conditions like lymphoma, Crohn’s disease, or congenital anomalies. Unlike single intussusceptions, which are often idiopathic and self-limiting, multiple cases are uncommon and usually present with severe symptoms and complications. The pathophysiology involves repeated or bilateral telescoping due to structural or inflammatory abnormalities, making it rare in clinical practice.
**Why Each Wrong Option is Incorrect**
Option B: Colocolic intussusception is relatively uncommon but more frequent than multiple types, often seen in older adults or with diverticular disease.
Option C: Ileoileal intussusception is the most common type, especially in children, due to the anatomical proximity of the ileum and ileum.
Option D: Ileoileocolic intussusception is a variant of ileocolic but still more common than multiple types, and is typically seen in pediatric cases.
**Clinical Pearl / High-Yield Fact**
In children, ileocolic intussusception is the most common type; multiple intussusceptions are rare and should raise suspicion for underlying malignancy or inflammatory bowel disease.
✓ Correct Answer: A. Multiple
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