Figure 1. Arterial phase contrast enhanced CT. Intrapancreatic accessory spleen (IPAS) (arrow) is located in the tail of the pancreas (P). The structure and density of the mass are quite similar to those of the main spleen (S), but this finding is quite similar to that of pancreatic hypervascular tumours. Reprinted by permission of the Society of Nuclear Medicine from: Ota T, et al. Intrapancreatic accessory spleen diagnosed by technetium-99m heat-damaged red blood cell SPECT. J Nucl Med 1997:38;494–5.