**Question:** A young boy presented with severe hematemesis (vomiting of blood). There was no hepatomegaly (enlarged liver) and mild splenomegaly (enlarged spleen) is present. Endoscopy shows esophageal varices. The most probable diagnosis -

A. Cirrhosis
B. Portal hypertension
C. Gastric ulcer
D. Peptic ulcer disease

**Correct Answer:** B. Portal hypertension

**Core Concept:**

Portal hypertension is a condition characterized by increased blood pressure within the portal vein system. This system includes the portal vein, hepatic veins, and the inferior vena cava. Portal hypertension results from the obstruction or narrowing of the portal vein, leading to elevated pressure and subsequent complications. In this case, the presence of esophageal varices on endoscopy is a key indicator of portal hypertension.

**Why the Correct Answer is Right:**

In this scenario, we have the following clues pointing towards portal hypertension:

1. Mild splenomegaly: Enlarged spleen is a common finding in portal hypertension due to increased blood flow and increased blood pressure within the spleen.
2. No hepatomegaly: The liver is usually enlarged in cirrhosis, which is a common cause of portal hypertension. Absence of hepatomegaly helps rule out cirrhosis as an initial diagnosis.
3. Esophageal varices on endoscopy: Esophageal varices are dilated blood vessels that form as a result of increased pressure in the portal vein system. Their presence strongly suggests portal hypertension.

**Why Each Wrong Option is Incorrect:**

A. Cirrhosis: While cirrhosis is a common cause of portal hypertension, the absence of hepatomegaly makes it less likely than portal hypertension.
B. Portal hypertension: The correct answer, as explained above.
C. Gastric ulcer: Gastric ulcers are usually caused by Helicobacter pylori infection or long-term use of nonsteroidal anti-inflammatory drugs (NSAIDs). They are not related to portal hypertension.
D. Peptic ulcer disease: Similar to option C, peptic ulcers are typically caused by H. pylori infection or NSAIDs. They are not directly related to portal hypertension.

**Clinical Pearl:**

Understanding the clinical presentation of portal hypertension is essential for accurate diagnosis and appropriate management. Intestinal bleeding caused by esophageal varices should prompt a thorough evaluation for underlying portal hypertension. A thorough evaluation should include blood tests and imaging studies like ultrasound to assess liver function and portal hypertension-related complications.