Reversed “3” sign on barium studies is seen in which condition: September 2009
**Core Concept**
The "reversed 3" sign, also known as the "reversed 3 sign" or "inverted 3 sign", is a radiological finding seen on barium studies of the gastrointestinal tract, specifically referring to the appearance of the duodenal bulb. This sign is associated with certain pathological conditions affecting the duodenum.
**Why the Correct Answer is Right**
The correct answer is related to a condition that causes narrowing or obstruction of the duodenal lumen, resulting in the characteristic "reversed 3" appearance on barium studies. This is often due to an ulcer or stricture in the duodenum, which alters the normal anatomical configuration.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not typically cause the "reversed 3" sign.
**Option B:** Similarly, this option is not associated with the characteristic radiological finding.
**Option C:** This choice is also incorrect as it does not lead to the "reversed 3" sign.
**Clinical Pearl / High-Yield Fact**
The "reversed 3" sign is a significant finding in barium studies, often indicative of a duodenal ulcer or stricture. Recognizing this sign is crucial for diagnosing and managing conditions affecting the duodenum.
**Correct Answer:** D. Duodenal ulcer