<prompt> A 7 year old girl from Bihar presented with three episodes of massive hematemesis and melena. There is no history of jaundice. On examination, she had a large spleen, non-palpable liver and mild ascites. Portal vein was not visualized on ultrasonography. Liver function tests were normal and endoscopy revealed esophageal varices. The most likely diagnosis isKala azar with portal hypertensionPortal hypertension of unknown etiologyChronic liver disease with portal hypertensionPortal hypertension due to extrahepatic obstruction  <response>: Differentiation between Extrahepatic and Hepatic Post hepatic portal hypertension Post sinusoidal and hepatic causes of portal hypertension will haveevidence of Liver parenchymal damage deranged LFT jaundicea dilated portal vein on ultrasonographyExtrahepatic presinusoidal obstruction will not have any effect on the Liver and hence there will be no evidence of hepatocellular damage.No jaundice No raised deranged LFTAlso non visualization of portal vein is a characteristic of portal vein thrombosis, an Extrahepatic cause.Esophageal varices and splenomegaly are a manifestation of portal hypertension and will be present in all the above sites of obstruction. 