Diffuse thickening of the gallbladder wall sonographically is not seen in which condition?

Diffuse thickening of the gallbladder wall can occur in several conditions, but it is important to identify the scenarios where this thickening is not typically observed. In the context of gallbladder pathology, the conditions that commonly cause wall thickening include acute cholecystitis, due to inflammation; hepatitis, which can lead to systemic changes affecting the gallbladder; and congestive heart failure, where fluid overload may cause edema in the gallbladder wall.

In the case of portal hypertension, while it may have systemic effects, it does not directly cause thickening of the gallbladder wall in the way that the other conditions do. Instead, portal hypertension can lead to other complications such as splenomegaly or ascites, but the gallbladder itself typically remains unaffected in terms of wall thickness. Therefore, the absence of diffuse thickening of the gallbladder wall in the context of portal hypertension makes it the correct answer to this question.