IPMNs in various grades. A. IPMN, low-grade, previously regarded as IPMN with low-grade dysplasia in WHO 2010. B. IPMN, low-grade, previously regarded as IPMN with intermediate-grade dysplasia in WHO 2010. C and D. IPMN, high-grade, previously regarded as IPMN with high-grade dysplasia in WHO 2010. All panels are hematoxylin and eosin staining. Original magnifications were A, 4×; B–D, 20×.