Fig. 1

An 82-year-old woman with primary pancreatic lymphoma, biopsy-proven diffuse large B-cell lymphoma. a Precontrast CT shows ill-defined pancreas head mass (white arrow). b Pancreatic phase dynamic contrast-enhanced CT shows round-shaped and slightly low density mass (white arrow). c Fat-suppressed T2-weighted MR image shows a circumscribed homogeneously hyperintense mass in the pancreatic head (white arrow). d Fat-suppressed T1-weighted MR image shows a hypointense mass in the pancreatic head (white arrow) relative to adjoining normal pancreatic parenchyma. e Pancreatic phase of dynamic contrast-enhanced MR image shows a circumscribed poorly enhanced mass (white arrow) in the pancreatic head with normally enhanced adjacent pancreatic parenchyma. f Haematoxylin-eosin-stained histologic section (original magnification ×200) shows the tumour composed of atypical large lymphoid cells with large nucleus