**Question:** On barium swallow the grade III esophageal varices appear as:

**Core Concept:**
Esophageal varices are dilated, tortuous veins in the mucosal layer of the esophagus. They occur due to increased pressure in the portal venous system and are commonly seen in patients with portal hypertension. Barium swallow is a radiographic technique used to visualize the gastrointestinal tract, including the esophagus.

**Why the Correct Answer is Right:**
Grade III esophageal varices are the most severe type and are associated with a high risk of bleeding. On barium swallow, they appear as dilated and tortuous veins that extend beyond the gastroesophageal junction into the stomach. This is due to the increased pressure in the portal venous system leading to dilation and tortuosity of the veins.

**Why Each Wrong Option is Incorrect:**
A. Grade I and II varices are not as dilated and tortuous as grade III varices, so they would be less likely to be seen on a barium swallow.
B. Barium does not accumulate in the blood vessels, so the presence of a contrast medium inside the veins is not a defining characteristic of grade III varices.
C. Barium does not affect the size or appearance of varices; the size and tortuosity are determined by the underlying portal hypertension.
D. Grade III varices are the most severe type, so they would be more likely to be present in patients with significant portal hypertension.

**Correct Answer:**
Correct Answer: **D. Grade III**

**Clinical Pearl:**
In patients with suspected portal hypertension or gastrointestinal bleeding, barium swallow can be used as a non-invasive method to assess the severity of esophageal varices. Grade III varices are associated with a higher risk of bleeding, so their detection is crucial in determining the need for prophylactic treatment and close monitoring.

In summary, grade III esophageal varices on barium swallow represent severe varices that extend beyond the gastroesophageal junction into the stomach. They are more likely to be present in patients with significant portal hypertension and are associated with a higher risk of bleeding compared to less severe grades. This information is important for the diagnosis and management of patients with gastrointestinal bleeding and suspected portal hypertension.