“Bird of Prey” sign is seen in the radiographic barium examination of:
**Core Concept**
The "Bird of Prey" sign is a radiographic finding observed during a barium examination, particularly in the small intestine. It is indicative of a specific condition where the barium-filled lumen of the intestine appears to be irregularly narrowed, resembling the shape of a bird in flight. This phenomenon is a result of the abnormal contraction of the intestinal wall, which leads to a characteristic appearance on the X-ray image.
**Why the Correct Answer is Right**
The "Bird of Prey" sign is typically associated with intussusception, a condition where one part of the intestine telescopes into another. This telescoping action causes the intestinal wall to contract and narrow, resulting in the characteristic "bird-like" appearance on the barium study. The abnormal contraction of the intestinal wall is thought to be due to the increased pressure exerted by the telescoping segment, which leads to the narrowing of the lumen.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the "Bird of Prey" sign is not typically associated with Crohn's disease, which is a type of inflammatory bowel disease that can cause narrowing of the intestine, but does not result in the characteristic telescoping seen in intussusception.
* **Option B:** This option is incorrect because the "Bird of Prey" sign is not a feature of celiac disease, which is an autoimmune disorder that affects the small intestine, but does not cause the telescoping seen in intussusception.
* **Option C:** This option is incorrect because the "Bird of Prey" sign is not a characteristic feature of gastrointestinal stromal tumors (GISTs), which are rare tumors that can occur in the stomach or small intestine, but do not typically cause the telescoping seen in intussusception.
**Clinical Pearl / High-Yield Fact**
The "Bird of Prey" sign is a classic radiographic finding in intussusception, but it is essential to remember that other conditions, such as intestinal obstruction or volvulus, can also cause narrowing of the intestinal lumen. Therefore, a thorough clinical evaluation and imaging studies are necessary to establish the correct diagnosis.
**Correct Answer: C. Intussusception**