Fig. 3

Pathologic features of the tumor. a The resected specimen consisted of a well-defined brown-white ovoid unilocular cystic mass in the pancreas, measuring 3.7 × 3.5 × 2.6 cm and filled with yellow-white friable material. b–d Microscopic examination showing that the intrapancreatic accessory spleen contains typical white and red pulp. H–e; b, × 12.5; c × 40) and that the cystic lesion was lined by multi-layered epithelium and contained keratin (d; h–e × 100)