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CT post-contrast appearance of a G1 pNET: a small lesion in the pancreatic head (yellow arrow) shows early enhancement during the arterial phase (a) with wash-out in the venous (b) and delayed (c) phases (type A CE pattern). The lesion has an arterial enhancement ratio of >1.1. (d) Immunostaining with CD34 antibody (×200) highlights vessels (red), showing that the intratumoural MVD is high (14%)
