Antral sign is seen in –
**Core Concept**
The antral sign, also known as the antral bulge, is a radiological finding seen on imaging studies, particularly in the context of gastrointestinal tract disorders. It refers to the bulging of the antral region of the stomach into the duodenal cap, which can be associated with various conditions.
**Why the Correct Answer is Right**
The antral sign is typically observed in cases of gastric outlet obstruction (GOO), where the normal flow of gastric contents is impeded. This obstruction can be caused by a variety of factors, including peptic ulcers, gastric cancer, or other pathologies that narrow the pyloric channel. As a result, the antral region of the stomach becomes distended and bulges into the duodenal cap, creating the characteristic antral sign.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the antral sign, which is a specific radiological finding associated with gastric outlet obstruction.
**Option B:** This option is incorrect because the antral sign is not typically seen in cases of gastric volvulus, which presents with a different set of radiological findings.
**Clinical Pearl / High-Yield Fact**
The antral sign is an important radiological finding that can aid in the diagnosis of gastric outlet obstruction. It is essential for clinicians to be aware of this sign and its implications in order to provide accurate diagnoses and effective treatment.
**Correct Answer:** C.