A patient has a surgical cause of obstructive jaundice. He is advised USG. All of the following can be detected on USG, except:

Ultrasound is the first radiological investigation done to evaluate obstructive or any jaundice. It is both sensitive and specific for diagnosing gallbladder stones and biliary tract dilatation. It is able to detect the level of biliary obstruction and most of other causative pathologies. It is also very sensitive for ascites and even minimal fluid can be detected. Peritoneal deposits could also be detected on USG, but with difficulty. CECT and MR are the preferred investigation for peritoneal deposits in that order.