An 80-year-old man has increasing jaundice with abdominal pain for the past 2 weeks. He has lost 4 kg over the past 5 months. On physical examination, there is the tenderness with palpable gallbladder in the right upper quadrant. An abdominal CT scan shows gallbladder and common bile duct dilation, along with a 3-cm mass in the head of the pancreas. Which of the following lesions is the most likely precursor to this mass?