Liver Ultrasound Indications
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Questions and Answers

What is the main indication for a single-phase contrast-enhanced computed tomography of the liver?

  • Staging known primary or secondary malignancy (correct)
  • To facilitate the placement of needles for biopsy
  • Suspected portal hypertension
  • Abnormal liver function tests
  • Why is oral contrast sometimes not necessary in liver CT imaging?

  • When only the liver parenchyma is being investigated (correct)
  • To identify hepatomegaly
  • To assess portal vein, hepatic artery, or hepatic veins
  • To follow-up after liver transplant
  • What is the ideal slice thickness for a routine liver CT imaging?

  • Dependent on the patient's body habitus
  • Around 60 to 70 s after contrast injection
  • Greater than 5 mm
  • Less than 5 mm (correct)
  • When should contrast-enhanced CT of the liver be performed during a helical/multislice CT scan?

    <p>During peak parenchymal enhancement</p> Signup and view all the answers

    Which of the following is a contraindication to undergoing a contrast-enhanced CT of the liver?

    <p>Pregnancy</p> Signup and view all the answers

    What imaging technique would be most suitable to assess a patient with suspected portal hypertension?

    <p>Multiphasic contrast-enhanced CT</p> Signup and view all the answers

    In liver imaging, what is the purpose of assessing patients with surgical shunts or TIPS procedures?

    <p>To evaluate patency and function of shunts</p> Signup and view all the answers

    What symptom might prompt a healthcare provider to consider a contrast-enhanced CT of the liver?

    <p>Right upper-quadrant pain</p> Signup and view all the answers

    During what phase does single-phase contrast-enhanced computed tomography image the liver?

    <p>Portal phase</p> Signup and view all the answers

    What is the benefit of using multiphasic contrast-enhanced computed tomography for liver imaging compared to single-phase imaging?

    <p>Better characterization of liver lesions</p> Signup and view all the answers

    What is the main reason that liver tumors enhance strongly during the arterial phase?

    <p>Due to receiving blood supply from the hepatic artery</p> Signup and view all the answers

    Why is it advisable to perform an arterial phase scan in addition to a portal venous phase CT scan for patients with suspected hypervascular primary or secondary liver tumors?

    <p>To enhance visualization of liver tumors that are most conspicuous during the early-phase arterial scanning</p> Signup and view all the answers

    What is the appropriate imaging protocol for suspected hepatocellular cancer?

    <p>Triple phase (early and late arterial with portal venous phase)</p> Signup and view all the answers

    Why might some centers characterize primary liver tumors using a quadruple-phase scan?

    <p>To include arterial, portal, and delayed scans</p> Signup and view all the answers

    In CT cholangiography, what is done to opacify the biliary tree?

    <p>Intravenous administration of a cholangiographic agent</p> Signup and view all the answers

    What are some common indications for performing computed tomography of the pancreas?

    <p>Acute pancreatitis and its complications along with chronic pancreatitis and its complications</p> Signup and view all the answers

    Why is positive contrast (iodinated) contraindicated if CT angiography is to be performed during imaging of the pancreas?

    <p>To avoid opacification of distal bowel loops</p> Signup and view all the answers

    Why is non-contrast-enhanced examination no longer indicated in initial scans for identifying calcifications in pancreatic imaging?

    <p>&quot;Calcifications are now evident on vascular phases&quot;</p> Signup and view all the answers

    "What is the main reason for reconstructing images at different thicknesses in the pancreatic and portal venous phases?"

    <p>&quot;To optimize contrast differentiation between adenocarcinoma and normal pancreatic tissue&quot;</p> Signup and view all the answers

    What is the main purpose of performing intraoperative cholangiography?

    <p>To avoid surgical exploration of the common bile duct</p> Signup and view all the answers

    What is a common occurrence during intraoperative cholangiography that may be relieved by glucagon, propantheline, or amyl nitrite?

    <p>Spasm of the sphincter of Oddi</p> Signup and view all the answers

    According to Le Quesne, which of the following is NOT a criterion for a normal operative choledochogram?

    <p>Presence of filling defects</p> Signup and view all the answers

    What is the recommended volume of contrast medium for intraoperative cholangiography?

    <p>10 mL</p> Signup and view all the answers

    Why is preoperative MRCP and/or EUS mentioned in relation to intraoperative cholangiography?

    <p>To avoid the need for surgical exploration in some centers</p> Signup and view all the answers

    What is the most appropriate indication for performing percutaneous transhepatic cholangiography?

    <p>Relief of obstructive jaundice</p> Signup and view all the answers

    What should be checked and corrected if necessary before performing percutaneous transhepatic cholangiography?

    <p>Hemoglobin, prothrombin time, and platelets</p> Signup and view all the answers

    What technique is used to insert the Chiba needle during percutaneous transhepatic cholangiography?

    <p>Insertion during suspended respiration</p> Signup and view all the answers

    What might happen if contrast medium is injected under high pressure into an obstructed biliary tract?

    <p>Increased risk of septicemia</p> Signup and view all the answers

    When is the ideal time to perform a percutaneous transhepatic cholangiography?

    <p>On the 10th postoperative day</p> Signup and view all the answers

    What is the main purpose of a wide-channelled endoscope in the context described?

    <p>To deploy metal biliary stents</p> Signup and view all the answers

    In the context of transhepatic puncture, what is the significance of a 22G Chiba needle?

    <p>To enable access into the bile ducts</p> Signup and view all the answers

    What is a common post-stent deployment step mentioned in the text?

    <p>Regular flushing of the catheter with saline</p> Signup and view all the answers

    What is a complication mentioned that can occur due to the passage of a guidewire?

    <p>Perforation of bile duct above the stricture</p> Signup and view all the answers

    What is a specific indication for the Percutaneous Extraction of Retained Biliary Calculi using the Burhenne Technique?

    <p>Retained biliary calculi seen on T-tube cholangiogram</p> Signup and view all the answers

    What is the main reason for avoiding excessive parenchymal injection during percutaneous transhepatic cholangiography (PTC)?

    <p>It results in opacification of intrahepatic lymphatics</p> Signup and view all the answers

    What is the recommended action if a duct is not entered at the first attempt during PTC?

    <p>Withdraw the needle tip and direct it more cranially, caudally, anteriorly, or posteriorly</p> Signup and view all the answers

    What is a possible complication of filling an obstructed duct system beyond capacity during PTC?

    <p>Septic shock due to overfilling</p> Signup and view all the answers

    When is a further image recommended after tilting the patient towards the erect position during PTC?

    <p>After an initial image showing an obstruction at the porta hepatis level</p> Signup and view all the answers

    What is the primary cause of septic shock during PTC according to the text?

    <p>The presence of choledocholithiasis leading to infected bile</p> Signup and view all the answers

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