1 MCQs in Radiology for NEET PG
A 68-year-old male presents with 3 weeks of progressive painless jaundice, dark urine, and pale stools. He has a 6 kg weight loss over 2 months and new-onset hyperglycemia. On examination, he has scleral icterus and a palpable non-tender distended gallbladder (Courvoisier sign). Abdominal ultrasound shows the double duct sign with the structure marked **A** measuring 18 mm with distal tapering at the ampullary region, dilated intrahepatic biliary radicles, and an ill-defined hypoechoic ampullary mass. Laboratory studies show obstructive jaundice with markedly elevated CA 19-9 (480 U/mL). Which of the following best explains the pathophysiology of the marked dilatation of the structure marked **A** in this clinical context?
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