An Unusual Case of Undifferentiated Carcinoma in situ With Osteoclast-like Giant Cells of the Pancreas

Undifferentiated carcinoma with OGCs usually exhibits an invasive tumor at diagnosis and is associated with a poor outcome, but the patient is alive without recurrence 22 months after surgery. To our knowledge, this is the first reported case of UC in situ without evident extraductal invasion in English literature.