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DECTA multiphasic study of a haemorrhagic spot in the middle sigmoid tract. In the arterial phase (a) an area of active bleeding is visible (arrow). In the virtual non-contrast post-processed axial image (b), it is possible to realise a selective subtraction of the contrast media density in order to obtain an image similar to the pre-contrast acquisition. In the iodinated distribution map of arterial phase (c), the blush of active bleeding is easily identified (arrow).
